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Subject: =?UTF-8?q?What=E2=80=99s_new_on_peptideprice:_payment_filters_and_sterili?=
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From: Derek from Research Radar <derekpruski@substack.com>
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View this post on the web at https://derekpruski.substack.com/p/whats-new-o=
n-peptideprice-payment

A weekend of updates to make vendor comparison faster and more accurate.
Spent this weekend pushing a round of updates to peptideprice.store [ https=
://substack.com/redirect/f76f57e4-54d0-49b1-9ca5-4e6208a623c9?j=3DeyJ1IjoiN=
Gl3b2U2In0.sVDxRtmZ85v8kfdamY0krRXGMy3p768BWtuZifRB-Zs ]. Two big additions=
 worth walking through =E2=80=94 one that should save you real money, and o=
ne that should make the testing score actually mean what you think it means=
=2E
If you=E2=80=99d rather watch than read, here=E2=80=99s a quick demo:=20
Payment options are now first-class
Until this weekend, payment methods lived on a separate page and didn=E2=80=
=99t influence pricing at all. That=E2=80=99s changed.
I logged into all ~30 retailers on the site to pull the most current paymen=
t info, and here=E2=80=99s what shipped:
New credit card icon next to every price. Click it and you=E2=80=99ll see e=
very payment method that retailer accepts, any discount or fee tied to each=
 one, and any special instructions (Zelle memos, payment windows, etc.).
New payment filter in Advanced Filters. Pick the methods you actually want =
to use and the tool shows you retailers that accept any of them.
Payment discounts now factor into the displayed price automatically. If you=
 filter for Zelle and a retailer offers 10% off for Zelle, that discount ge=
ts applied on top of any sale already running. A small green chip under the=
 price tells you what got applied so you can see exactly what=E2=80=99s sta=
cking.
The /source-info page now has a payment column. The number shows how many m=
ethods that retailer accepts, and a star means at least one of those method=
s gets you a discount.
I=E2=80=99m committing to weekly payment updates for now. Payment processin=
g in this space changes fast =E2=80=94 sometimes within minutes =E2=80=94 s=
o weekly is the floor. I=E2=80=99ll bump that frequency over time.
Sterility vs PCR vs bioburden =E2=80=94 finally split out
This one=E2=80=99s been a long time coming. The testing score was lumping t=
hree pretty different tests into one bucket, and that wasn=E2=80=99t fair t=
o the retailers paying for the gold-standard test or honest with you about =
what you were actually seeing.
The three tests are not interchangeable:
Sterility (14 Day USP) =E2=80=94 USP 71. This is the gold standard. Two-wee=
k growth test. Worth a full point in the testing score.
Sterility (PCR / rapid) =E2=80=94 DNA-based, hours instead of weeks. Newer =
technology, but still a real sterility check. Worth half a point.
Bioburden (5 Day) =E2=80=94 USP 61. This is not a sterility test. It counts=
 microbes but doesn=E2=80=99t prove sterility. Worth half a point.
The filters now treat each one separately, so if you only want vendors runn=
ing full 14-day USP sterility testing, you can filter for exactly that.
A quick note on how the filters behave:
Pick more than one testing box and the tool only shows retailers that do al=
l of them.
Pick more than one payment method and the tool shows retailers that accept =
any of them.
The =F0=9F=A7=AA X/7 badge still covers the same seven testing categories: =
Net Content, Net Purity, ID, Endotoxins, Sterility/Bioburden, Heavy Metals,=
 and Conformity.
Go test it out
Both features are live right now at peptideprice.store [ https://substack.c=
om/redirect/f76f57e4-54d0-49b1-9ca5-4e6208a623c9?j=3DeyJ1IjoiNGl3b2U2In0.sV=
DxRtmZ85v8kfdamY0krRXGMy3p768BWtuZifRB-Zs ]. There are 17 sales running as =
of this morning, so it=E2=80=99s a good time to poke around and see how the=
 payment filter changes which deals actually come out cheapest for you.
As always, everything on the site is for research purposes only.
=E2=80=94 Derek

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@media screen and (max-width: 650px) {
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}
@media (max-width: 420px) {
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embed-img,
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}
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}
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@media screen and (min-width: 541px) {
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}
@media screen and (max-width: 650px) {
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@media screen and (max-width: 650px) {
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@media screen and (max-width: 650px) {
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}
@media screen and (max-width: 650px) {
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}
@media screen and (max-width: 650px) {
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@media screen and (max-width: 650px) {
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@media screen and (min-width: 768px) {
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@media screen and (max-width: 650px) {
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}
@media screen and (max-width: 650px) {
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}
@media screen and (max-width: 650px) {
  .post-silhouette .post-silhouette-meta.with-byline-image {
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}
@media screen and (max-width: 650px) {
  .use-theme-bg .post-meta.alternative-meta .post-meta-item,
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}
@media screen and (max-width: 370px) {
  .use-theme-bg .post-meta.alternative-meta .post-meta-item,
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}
@media screen and (max-width: 650px) {
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blication,
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}
@media screen and (max-width: 370px) {
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}
@media screen and (max-width: 370px) {
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}
@media screen and (max-width: 650px) {
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}
@media (max-width: 1024px) {
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}
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}
@media (min-width: 1024px) {
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}
@media (max-width: 1024px) {
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{
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}
@media (max-width: 768px) {
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  body .markup div.sponsorship-campaign-embed:first-child {
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}
@media screen and (max-width: 650px) {
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}
@media screen and (max-width: 370px) {
  body .markup div.tiktok-wrap {
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}
@media screen and (max-width: 650px) {
  body .markup div.embedded-publication-wrap .embedded-publication.show-sub=
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    padding: 24px;
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}
@media screen and (max-width: 650px) {
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ribe,
  body .markup div.subscription-widget-wrap-editor .subscription-widget.sho=
w-subscribe,
  body .markup div.captioned-button-wrap .subscription-widget.show-subscrib=
e {
    padding: 0px 24px;
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}
@media screen and (max-width: 650px) {
  body .markup div.subscription-widget-wrap .subscription-widget.show-subsc=
ribe .subscription-widget-subscribe .button,
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w-subscribe .subscription-widget-subscribe .button,
  body .markup div.captioned-button-wrap .subscription-widget.show-subscrib=
e .subscription-widget-subscribe .button {
    padding: 10px 12px;
    min-width: 110px;
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}
@media (max-width: 650px) {
  body .markup .twitter-embed,
  body .markup .tweet {
    padding: 12px;
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}
@media (max-width: 650px) {
  body .markup .twitter-embed .tweet-text,
  body .markup .tweet .tweet-text {
    font-size: 14px;
    line-height: 20px;
  }
}
@media (max-width: 650px) {
  body .markup .twitter-embed .tweet-photos-container.two,
  body .markup .tweet .tweet-photos-container.two,
  body .markup .twitter-embed .tweet-photos-container.three,
  body .markup .tweet .tweet-photos-container.three,
  body .markup .twitter-embed .tweet-photos-container.four,
  body .markup .tweet .tweet-photos-container.four {
    height: 200px;
  }
}
@media (max-width: 650px) {
  body .markup .twitter-embed a.expanded-link .expanded-link-img,
  body .markup .tweet a.expanded-link .expanded-link-img {
    max-height: 180px;
  }
}
@media (max-width: 650px) {
  body .markup .twitter-embed a.expanded-link .expanded-link-description,
  body .markup .tweet a.expanded-link .expanded-link-description {
    display: none;
  }
}
@media screen and (max-width: 650px) {
  body .markup .apple-podcast-container {
    width: unset;
  }
}
@media (max-width: 420px) {
  body .markup .install-substack-app-embed img.install-substack-app-embed-i=
mg {
    margin: 0 auto 16px auto;
  }
}
@media (max-width: 420px) {
  body .markup .install-substack-app-embed .install-substack-app-embed-text=
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    margin: 0 0 12px 0;
    max-width: 100%;
    width: auto;
    text-align: center;
  }
}
@media (max-width: 420px) {
  body .markup .install-substack-app-embed .install-substack-app-embed-link=
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    display: flex;
    justify-content: center;
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}
@media screen and (min-width: 500px) {
  body .header a.logo {
    width: 42px;
    height: 42px;
    border-radius: 12px;
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}
@media screen and (max-width: 420px) {
  body .subscription-receipt table:first-of-type .subscription-amount .subs=
cription-discount {
    width: 72px !important;
  }
}
@media screen and (min-width: 481px) {
  body .share-button-container {
    height: auto;
  }
}
@media screen and (max-width: 480px) {
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    display: block !important;
    margin: 0 !important;
    height: 8px !important;
    border-left: none !important;
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}
@media screen and (max-width: 650px) {
  .digest .item .post-meta-item.audience {
    display: none;
  }
}
@media screen and (min-width: 500px) {
  .digest-publication .logo img {
    width: 42px;
    height: 42px;
    border-radius: 8px;
  }
}
@media screen and (max-width: 650px) {
  .comments-page .container .comment-list .collapsed-reply {
    margin-left: calc(10 + 32px - 24px);
  }
}
@media screen and (max-width: 650px) {
  .comment > .comment-list {
    padding-left: 24px;
  }
}
@media screen and (max-width: 650px) {
  .finish-magic-login-modal .modal-content .container {
    padding: 24px 0;
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}
@media (max-width: 650px) {
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    line-height: 24px;
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}
@media screen and (max-width: 650px) {
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    line-height: 24px;
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}
@media screen and (min-width: 541px) {
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    padding-right: 12px;
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}
@media screen and (max-width: 650px) {
  .subscribe-widget form.form .sideBySideWrap button.rightButton {
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}
@media screen and (min-width: 541px) {
  .pub-icon:hover .logo-hover,
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    display: block;
  }
}
@media screen and (max-width: 650px) {
  .post-ufi.single-full-width-button .post-ufi-button-wrapper {
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    padding: 16px;
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  .post-ufi.single-full-width-button .post-ufi-button-wrapper:empty {
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}
@media screen and (max-width: 768px) {
  .file-embed-wrapper {
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}
@media screen and (max-width: 768px) {
  .file-embed-wrapper-editor {
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}
@media screen and (max-width: 768px) {
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}
@media only screen and (max-width: 650px) {
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}
@media only screen and (min-width: 630px) {
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}
@media screen and (min-width: 541px) {
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}
@media screen and (max-width: 650px) {
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}
@media screen and (max-width: 650px) {
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}
@media screen and (max-width: 650px) {
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}
@media screen and (max-width: 650px) {
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}
@media (min-width: 250px) {
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}
@media (min-width: 300px) {
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}
@media (min-width: 350px) {
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  .audio-player-wrapper-fancy .audio-player .audio-player-title {
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ner {
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    width: 15%;
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  .audio-player-wrapper-fancy .audio-player .audio-player-substack-logo {
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}
@media (min-width: 350px) {
  .audio-player-wrapper-fancy .audio-player .audio-player-hero-image-contai=
ner {
    padding-top: 25%;
    width: 25%;
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e {
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}
@media (min-width: 400px) {
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ner {
    padding-top: 40%;
    width: 40%;
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}
@media (max-width: 400px) {
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    margin-top: 12px;
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  .audio-player-wrapper-fancy .audio-player .btn-group .button {
    font-size: 13px;
    padding: 6px 12px;
    height: auto;
    margin-top: 10px;
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}
@media (min-width: 600px) {
  .audio-player-wrapper-fancy .audio-player .audio-player-hero-image-contai=
ner {
    padding-top: 55%;
    width: 55%;
  }
}
@media (max-width: 650px) {
  .poll-editor-modal {
    min-width: calc(100% - 20px);
  }
}
@media (max-width: 750px) {
  .poll-embed .poll-anchor-target .poll-anchor-copy-button {
    left: 8px;
    top: 45px;
  }
}
@media not all and (min-resolution: 0.001dpcm) {
  @supports (-webkit-appearance: none) {
    p a:not(.primary.button),
    .post p:not(.button-wrapper) a:not(.primary.button),
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    .thread-head .markup p:not(.button-wrapper) a:not(.primary.button) {
      color: #ff6719;
      text-decoration: none;
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    p a:not(.primary.button):hover,
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    .thread-head .markup p:not(.button-wrapper) a:not(.primary.button):hove=
r {
      text-decoration: underline;
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  }
}</style></head><body class=3D"email-body" style=3D"font-kerning: auto;--im=
age-offset-margin: -120px;"><img src=3D"https://eotrx.substackcdn.com/o/cbe=
ae065e743edc9/p.gif?token=3DeyJtIjoiPDIwMjYwNTEwMjIwODQ5LjMuNzQzN2Y2YzA1ZWI=
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2xldHRlciIsImEiOiJldmVyeW9uZSIsInMiOjMzNjUzNjcsImMiOiJwb3N0IiwiZiI6dHJ1ZSwi=
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icHViLTAiLCJzdWIiOiJlbyJ9.gnVIvkK4grwFIINGACU7hm5SRoGWsm_vtc223uDnyGs" alt=
=3D"" width=3D"1" height=3D"1" border=3D"0" style=3D"height:1px !important;=
width:1px !important;border-width:0 !important;margin-top:0 !important;marg=
in-bottom:0 !important;margin-right:0 !important;margin-left:0 !important;p=
adding-top:0 !important;padding-bottom:0 !important;padding-right:0 !import=
ant;padding-left:0 !important;"/><div class=3D"preview" style=3D"display:no=
ne;font-size:1px;color:#333333;line-height:1px;max-height:0px;max-width:0px=
;opacity:0;overflow:hidden;">A weekend of updates to make vendor comparison=
 faster and more accurate.</div><div class=3D"preview" style=3D"display:non=
e;font-size:1px;color:#333333;line-height:1px;max-height:0px;max-width:0px;=
opacity:0;overflow:hidden;">&#847; &nbsp; &#8199; &#173;&#847; &nbsp; &#819=
9; &#173;&#847; &nbsp; &#8199; &#173;&#847; &nbsp; &#8199; &#173;&#847; &nb=
sp; &#8199; &#173;&#847; &nbsp; &#8199; &#173;&#847; &nbsp; &#8199; &#173;&=
#847; &nbsp; &#8199; &#173;&#847; &nbsp; &#8199; &#173;&#847; &nbsp; &#8199=
; &#173;&#847; &nbsp; &#8199; &#173;&#847; &nbsp; &#8199; &#173;&#847; &nbs=
p; &#8199; &#173;&#847; &nbsp; &#8199; &#173;&#847; &nbsp; &#8199; &#173;&#=
847; &nbsp; &#8199; &#173;&#847; &nbsp; &#8199; &#173;&#847; &nbsp; &#8199;=
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case;letter-spacing: .2px;"><time datetime=3D"2026-05-10T22:08:48.884Z">May=
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y></table></td><td width=3D"8" style=3D"min-width:8px;"></td><td style=3D"v=
ertical-align:middle;"><table role=3D"presentation" width=3D"38" border=3D"=
0" cellspacing=3D"0" cellpadding=3D"0"><tbody><tr><td align=3D"center"><a c=
lass=3D"email-icon-button" href=3D"https://substack.com/redirect/2/eyJlIjoi=
aHR0cHM6Ly9vcGVuLnN1YnN0YWNrLmNvbS9wdWIvZGVyZWtwcnVza2kvcC93aGF0cy1uZXctb24=
tcGVwdGlkZXByaWNlLXBheW1lbnQ_dXRtX3NvdXJjZT1zdWJzdGFjayZ1dG1fbWVkaXVtPWVtYW=
lsJnV0bV9jYW1wYWlnbj1lbWFpbC1yZXN0YWNrLWNvbW1lbnQmYWN0aW9uPXJlc3RhY2stY29tb=
WVudCZyPTRpd29lNiZ0b2tlbj1leUoxYzJWeVgybGtJam95TnpNMk1qSXpPVGdzSW5CdmMzUmZh=
V1FpT2pFNU56RTBPVGM1TXl3aWFXRjBJam94TnpjNE5EVXhNREV5TENKbGVIQWlPakUzT0RFd05=
ETXdNVElzSW1semN5STZJbkIxWWkwek16WTFNelkzSWl3aWMzVmlJam9pY0c5emRDMXlaV0ZqZE=
dsdmJpSjkuNUR3R1QzSzFJc1J0Y3lPZjNGbFZTTlFiR0F1dEVLRGtUV0V4MkxyRmQ0YyIsInAiO=
jE5NzE0OTc5MywicyI6MzM2NTM2NywiZiI6dHJ1ZSwidSI6MjczNjIyMzk4LCJpYXQiOjE3Nzg0=
NTEwMTIsImV4cCI6MjA5NDAyNzAxMiwiaXNzIjoicHViLTAiLCJzdWIiOiJsaW5rLXJlZGlyZWN=
0In0.11_q73hkqUEXji3Ze3g275-B-K8fnfLPW4e7nLs0VHQ?&utm_source=3Dsubstack&utm=
_medium=3Demail" style=3D"font-family: system-ui,-apple-system,BlinkMacSyst=
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goe UI Emoji','Segoe UI Symbol';display: inline-block;font-weight: 500;bord=
er: 1px solid rgb(0,0,0,.1);border-radius: 9999px;text-transform: uppercase=
;font-size: 12px;line-height: 1;padding: 9px 0;text-decoration: none;color:=
 rgb(119,119,119);min-width: 38px;box-sizing: border-box;width: 38px"><img =
class=3D"icon" src=3D"https://substackcdn.com/image/fetch/$s_!ubXF!,w_36,c_=
scale,f_png,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack.com%2Fi=
con%2Fnotes__NoteRestackIcon%3Fv%3D4%26height%3D36%26fill%3Dnone%26stroke%3=
D%2523808080%26strokeWidth%3D2%26strokeLinecap%3Dround%26strokeLinejoin%3Dr=
ound" width=3D"18" height=3D"18" alt=3D"" style=3D"max-width: 550px;border:=
 none !important;vertical-align: middle;"></a></td></tr></tbody></table></t=
d></tr></tbody></table></td><td align=3D"right"><table role=3D"presentation=
" width=3D"auto" border=3D"0" cellspacing=3D"0" cellpadding=3D"0"><tbody><t=
r><td style=3D"vertical-align:middle;"><table role=3D"presentation" width=
=3D"auto" border=3D"0" cellspacing=3D"0" cellpadding=3D"0"><tbody><tr><td a=
lign=3D"center"><a class=3D"email-button-outline" href=3D"https://open.subs=
tack.com/pub/derekpruski/p/whats-new-on-peptideprice-payment?utm_source=3De=
mail&redirect=3Dapp-store&utm_campaign=3Demail-read-in-app" style=3D"font-f=
amily: system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helveti=
ca,Arial,sans-serif,'Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol';=
display: inline-block;font-weight: 500;border: 1px solid rgb(0,0,0,.1);bord=
er-radius: 9999px;text-transform: uppercase;font-size: 12px;line-height: 12=
px;padding: 9px 14px;text-decoration: none;color: rgb(119,119,119);"><div c=
lass=3D"email-button-spacer" style=3D"font-size: 16px;line-height: 26px;dis=
play: inline-block;vertical-align: middle;max-width: 0;min-height: 18px;"><=
/div><span class=3D"email-button-text" style=3D"vertical-align: middle;marg=
in-right: 4px">READ IN APP</span><img class=3D"icon text-icon" src=3D"https=
://substackcdn.com/image/fetch/$s_!ET-_!,w_36,c_scale,f_png,q_auto:good,fl_=
progressive:steep/https%3A%2F%2Fsubstack.com%2Ficon%2FLucideArrowUpRight%3F=
v%3D4%26height%3D36%26fill%3Dnone%26stroke%3D%2523808080%26strokeWidth%3D2"=
 width=3D"18" height=3D"18" style=3D"min-width: 18px;min-height: 18px;borde=
r: none;vertical-align: middle;margin-right: 0;margin-left: 0;max-width: 18=
px" alt=3D""></a></td></tr></tbody></table></td></tr></tbody></table></td><=
/tr></tbody></table></td></tr><tr height=3D"16"><td height=3D"16" style=3D"=
font-size:0px;line-height:0;">&nbsp;</td></tr></tbody></table></div></div><=
div class=3D"post typography" dir=3D"auto" style=3D"--image-offset-margin: =
-120px;padding: 32px 0 0 0;font-size: 16px;line-height: 26px;"><div class=
=3D"body markup" dir=3D"auto" style=3D"text-align: initial;font-size: 16px;=
line-height: 26px;width: 100%;word-break: break-word;margin-bottom: 16px;">=
<p style=3D"margin: 0 0 20px 0;color: rgb(54,55,55);line-height: 26px;font-=
size: 16px;margin-top: 0;"><em>A weekend of updates to make vendor comparis=
on faster and more accurate.</em></p><p style=3D"margin: 0 0 20px 0;color: =
rgb(54,55,55);line-height: 26px;font-size: 16px;"><span>Spent this weekend =
pushing a round of updates to </span><a href=3D"https://substack.com/redire=
ct/f76f57e4-54d0-49b1-9ca5-4e6208a623c9?j=3DeyJ1IjoiNGl3b2U2In0.sVDxRtmZ85v=
8kfdamY0krRXGMy3p768BWtuZifRB-Zs" style=3D"color: #ff6719;text-decoration: =
none;">peptideprice.store</a><span>. Two big additions worth walking throug=
h &#8212; one that should save you real money, and one that should make the=
 testing score actually mean what you think it means.</span></p><p style=3D=
"margin: 0 0 20px 0;color: rgb(54,55,55);line-height: 26px;font-size: 16px;=
">If you&#8217;d rather watch than read, here&#8217;s a quick demo: </p><a =
class=3D"vimeo-wrap" href=3D"https://substack.com/redirect/1bf025be-3ab2-42=
bd-b078-bd49c184334c?j=3DeyJ1IjoiNGl3b2U2In0.sVDxRtmZ85v8kfdamY0krRXGMy3p76=
8BWtuZifRB-Zs" target=3D"_blank" data-component-name=3D"VimeoToDOMStatic" s=
tyle=3D"display: block;margin: 32px 0;"><img src=3D"https://substackcdn.com=
/image/vimeo/w_550,c_limit,d_video_placeholder.png/l_youtube_play_qyqt8q,w_=
170/1190988076" style=3D"border: none !important;vertical-align: middle;-ms=
-interpolation-mode: bicubic;max-width: 100%;height: auto;margin: 0 auto;di=
splay: block;width: 100%;"></a><h2 class=3D"header-anchor-post" style=3D"po=
sition: relative;font-family: 'SF Pro Display',-apple-system-headline,syste=
m-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,san=
s-serif,'Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol';font-weight:=
 bold;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: antialia=
sed;-webkit-appearance: optimizelegibility;-moz-appearance: optimizelegibil=
ity;appearance: optimizelegibility;margin: 1em 0 0.625em 0;color: rgb(54,55=
,55);line-height: 1.16em;font-size: calc(1.625em * 1);">Payment options are=
 now first-class</h2><p style=3D"margin: 0 0 20px 0;color: rgb(54,55,55);li=
ne-height: 26px;font-size: 16px;">Until this weekend, payment methods lived=
 on a separate page and didn&#8217;t influence pricing at all. That&#8217;s=
 changed.</p><p style=3D"margin: 0 0 20px 0;color: rgb(54,55,55);line-heigh=
t: 26px;font-size: 16px;">I logged into all ~30 retailers on the site to pu=
ll the most current payment info, and here&#8217;s what shipped:</p><ul sty=
le=3D"margin-top: 0;padding: 0;"><li style=3D"margin: 8px 0 0 32px;mso-spec=
ial-format: bullet;"><p style=3D"color: rgb(54,55,55);line-height: 26px;mar=
gin-bottom: 0;box-sizing: border-box;padding-left: 4px;font-size: 16px;marg=
in: 0;"><strong>New credit card icon next to every price.</strong><span> Cl=
ick it and you&#8217;ll see every payment method that retailer accepts, any=
 discount or fee tied to each one, and any special instructions (Zelle memo=
s, payment windows, etc.).</span></p></li><li style=3D"margin: 8px 0 0 32px=
;mso-special-format: bullet;"><p style=3D"color: rgb(54,55,55);line-height:=
 26px;margin-bottom: 0;box-sizing: border-box;padding-left: 4px;font-size: =
16px;margin: 0;"><strong>New payment filter in Advanced Filters.</strong><s=
pan> Pick the methods you actually want to use and the tool shows you retai=
lers that accept any of them.</span></p></li><li style=3D"margin: 8px 0 0 3=
2px;mso-special-format: bullet;"><p style=3D"color: rgb(54,55,55);line-heig=
ht: 26px;margin-bottom: 0;box-sizing: border-box;padding-left: 4px;font-siz=
e: 16px;margin: 0;"><strong>Payment discounts now factor into the displayed=
 price automatically.</strong><span> If you filter for Zelle and a retailer=
 offers 10% off for Zelle, that discount gets applied on top of any sale al=
ready running. A small green chip under the price tells you what got applie=
d so you can see exactly what&#8217;s stacking.</span></p></li><li style=3D=
"margin: 8px 0 0 32px;mso-special-format: bullet;"><p style=3D"color: rgb(5=
4,55,55);line-height: 26px;margin-bottom: 0;box-sizing: border-box;padding-=
left: 4px;font-size: 16px;margin: 0;"><strong>The </strong><code>/source-in=
fo</code><strong> page now has a payment column.</strong><span> The number =
shows how many methods that retailer accepts, and a star means at least one=
 of those methods gets you a discount.</span></p></li></ul><p style=3D"marg=
in: 0 0 20px 0;color: rgb(54,55,55);line-height: 26px;font-size: 16px;"><sp=
an>I&#8217;m committing to </span><strong>weekly payment updates</strong><s=
pan> for now. Payment processing in this space changes fast &#8212; sometim=
es within minutes &#8212; so weekly is the floor. I&#8217;ll bump that freq=
uency over time.</span></p><h2 class=3D"header-anchor-post" style=3D"positi=
on: relative;font-family: 'SF Pro Display',-apple-system-headline,system-ui=
,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-se=
rif,'Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol';font-weight: bol=
d;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: antialiased;=
-webkit-appearance: optimizelegibility;-moz-appearance: optimizelegibility;=
appearance: optimizelegibility;margin: 1em 0 0.625em 0;color: rgb(54,55,55)=
;line-height: 1.16em;font-size: calc(1.625em * 1);">Sterility vs PCR vs bio=
burden &#8212; finally split out</h2><p style=3D"margin: 0 0 20px 0;color: =
rgb(54,55,55);line-height: 26px;font-size: 16px;">This one&#8217;s been a l=
ong time coming. The testing score was lumping three pretty different tests=
 into one bucket, and that wasn&#8217;t fair to the retailers paying for th=
e gold-standard test or honest with you about what you were actually seeing=
=2E</p><p style=3D"margin: 0 0 20px 0;co=
lor: rgb(54,55,55);line-height: 26px;=
font-size: 16px;">The three tests are not interchangeable:</p><ul style=3D"=
margin-top: 0;padding: 0;"><li style=3D"margin: 8px 0 0 32px;mso-special-fo=
rmat: bullet;"><p style=3D"color: rgb(54,55,55);line-height: 26px;margin-bo=
ttom: 0;box-sizing: border-box;padding-left: 4px;font-size: 16px;margin: 0;=
"><strong>Sterility (14 Day USP)</strong><span> &#8212; USP 71. This is the=
 gold standard. Two-week growth test. Worth a full point in the testing sco=
re.</span></p></li><li style=3D"margin: 8px 0 0 32px;mso-special-format: bu=
llet;"><p style=3D"color: rgb(54,55,55);line-height: 26px;margin-bottom: 0;=
box-sizing: border-box;padding-left: 4px;font-size: 16px;margin: 0;"><stron=
g>Sterility (PCR / rapid)</strong><span> &#8212; DNA-based, hours instead o=
f weeks. Newer technology, but still a real sterility check. Worth half a p=
oint.</span></p></li><li style=3D"margin: 8px 0 0 32px;mso-special-format: =
bullet;"><p style=3D"color: rgb(54,55,55);line-height: 26px;margin-bottom: =
0;box-sizing: border-box;padding-left: 4px;font-size: 16px;margin: 0;"><str=
ong>Bioburden (5 Day)</strong><span> &#8212; USP 61. This is </span><em>not=
</em><span> a sterility test. It counts microbes but doesn&#8217;t prove st=
erility. Worth half a point.</span></p></li></ul><p style=3D"margin: 0 0 20=
px 0;color: rgb(54,55,55);line-height: 26px;font-size: 16px;">The filters n=
ow treat each one separately, so if you only want vendors running full 14-d=
ay USP sterility testing, you can filter for exactly that.</p><p style=3D"m=
argin: 0 0 20px 0;color: rgb(54,55,55);line-height: 26px;font-size: 16px;">=
A quick note on how the filters behave:</p><ul style=3D"margin-top: 0;paddi=
ng: 0;"><li style=3D"margin: 8px 0 0 32px;mso-special-format: bullet;"><p s=
tyle=3D"color: rgb(54,55,55);line-height: 26px;margin-bottom: 0;box-sizing:=
 border-box;padding-left: 4px;font-size: 16px;margin: 0;"><span>Pick more t=
han one </span><strong>testing</strong><span> box and the tool only shows r=
etailers that do all of them.</span></p></li><li style=3D"margin: 8px 0 0 3=
2px;mso-special-format: bullet;"><p style=3D"color: rgb(54,55,55);line-heig=
ht: 26px;margin-bottom: 0;box-sizing: border-box;padding-left: 4px;font-siz=
e: 16px;margin: 0;"><span>Pick more than one </span><strong>payment</strong=
><span> method and the tool shows retailers that accept any of them.</span>=
</p></li></ul><p style=3D"margin: 0 0 20px 0;color: rgb(54,55,55);line-heig=
ht: 26px;font-size: 16px;">The &#129514; X/7 badge still covers the same se=
ven testing categories: Net Content, Net Purity, ID, Endotoxins, Sterility/=
Bioburden, Heavy Metals, and Conformity.</p><h2 class=3D"header-anchor-post=
" style=3D"position: relative;font-family: 'SF Pro Display',-apple-system-h=
eadline,system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvet=
ica,Arial,sans-serif,'Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol'=
;font-weight: bold;-webkit-font-smoothing: antialiased;-moz-osx-font-smooth=
ing: antialiased;-webkit-appearance: optimizelegibility;-moz-appearance: op=
timizelegibility;appearance: optimizelegibility;margin: 1em 0 0.625em 0;col=
or: rgb(54,55,55);line-height: 1.16em;font-size: calc(1.625em * 1);">Go tes=
t it out</h2><p style=3D"margin: 0 0 20px 0;color: rgb(54,55,55);line-heigh=
t: 26px;font-size: 16px;"><span>Both features are live right now at </span>=
<a href=3D"https://substack.com/redirect/f76f57e4-54d0-49b1-9ca5-4e6208a623=
c9?j=3DeyJ1IjoiNGl3b2U2In0.sVDxRtmZ85v8kfdamY0krRXGMy3p768BWtuZifRB-Zs" sty=
le=3D"color: #ff6719;text-decoration: none;">peptideprice.store</a><span>. =
There are 17 sales running as of this morning, so it&#8217;s a good time to=
 poke around and see how the payment filter changes which deals actually co=
me out cheapest for you.</span></p><p style=3D"margin: 0 0 20px 0;color: rg=
b(54,55,55);line-height: 26px;font-size: 16px;"><span>As always, everything=
 on the site is </span><strong>for research purposes only</strong><span>.</=
span></p><p style=3D"margin: 0 0 20px 0;color: rgb(54,55,55);line-height: 2=
6px;font-size: 16px;margin-bottom: 0;">&#8212; Derek</p></div></div><div cl=
ass=3D"container-border" style=3D"margin: 32px 0 0;width: 100%;box-sizing: =
border-box;border-top: 1px solid #e6e6e6;font-size: 16px;line-height: 26px;=
"></div><div class=3D"post-cta typography markup" style=3D"--image-offset-m=
argin: -120px;text-align: initial;word-break: break-word;margin-bottom: 32p=
x;margin: 32px 0;font-size: 16px;line-height: 26px;"><p style=3D"color: rgb=
(54,55,55);margin: 0 auto 20px;text-align: center;width: 90%;line-height: 2=
6px;font-size: 16px;margin-top: 0;"><span class=3D"pencraft pc-reset reset-=
IxiVJZ" translated=3D"" style=3D"list-style: none;color: unset;text-decorat=
ion: unset;margin: 0;">You're currently a free subscriber to <a href=3D"htt=
ps://substack.com/redirect/6e600499-7a45-4137-b743-5bedf799d890?j=3DeyJ1Ijo=
iNGl3b2U2In0.sVDxRtmZ85v8kfdamY0krRXGMy3p768BWtuZifRB-Zs" style=3D"color: #=
ff6719;text-decoration: none;">Research Radar</a>. For the full experience,=
 <a href=3D"https://substack.com/redirect/2/eyJlIjoiaHR0cHM6Ly9kZXJla3BydXN=
raS5zdWJzdGFjay5jb20vc3Vic2NyaWJlP3V0bV9zb3VyY2U9cG9zdCZ1dG1fY2FtcGFpZ249ZW=
1haWwtY2hlY2tvdXQmbmV4dD1odHRwcyUzQSUyRiUyRmRlcmVrcHJ1c2tpLnN1YnN0YWNrLmNvb=
SUyRnAlMkZ3aGF0cy1uZXctb24tcGVwdGlkZXByaWNlLXBheW1lbnQmcj00aXdvZTYmdG9rZW49=
ZXlKMWMyVnlYMmxrSWpveU56TTJNakl6T1Rnc0ltbGhkQ0k2TVRjM09EUTFNVEF4TWl3aVpYaHd=
Jam94TnpneE1EUXpNREV5TENKcGMzTWlPaUp3ZFdJdE16TTJOVE0yTnlJc0luTjFZaUk2SW1Ob1=
pXTnJiM1YwSW4wLlU1R05hM0I4ZlBtRVJRcXNqSHlOWXZOWXhjU2hSbThiWDdmbldfdk1hNkEiL=
CJwIjoxOTcxNDk3OTMsInMiOjMzNjUzNjcsImYiOnRydWUsInUiOjI3MzYyMjM5OCwiaWF0Ijox=
Nzc4NDUxMDEyLCJleHAiOjIwOTQwMjcwMTIsImlzcyI6InB1Yi0wIiwic3ViIjoibGluay1yZWR=
pcmVjdCJ9.q-0elJOsg909tVdJX4ZfPBuXSTN2iPh_VRzr3H49ENY?&utm_source=3Dsubstac=
k&utm_medium=3Demail&utm_content=3Dpostcta" style=3D"color: #ff6719;text-de=
coration: none;">upgrade your subscription.</a></span></p><p class=3D"cta-b=
ox" style=3D"color: rgb(54,55,55);margin: 0 auto 20px;width: 90%;line-heigh=
t: 26px;font-size: 16px;margin-bottom: 0;text-align: center;margin-left: au=
to;margin-right: auto;"><a class=3D"button primary" role=3D"button" href=3D=
"https://substack.com/redirect/2/eyJlIjoiaHR0cHM6Ly9kZXJla3BydXNraS5zdWJzdG=
Fjay5jb20vc3Vic2NyaWJlP3V0bV9zb3VyY2U9cG9zdCZ1dG1fY2FtcGFpZ249ZW1haWwtY2hlY=
2tvdXQmbmV4dD1odHRwcyUzQSUyRiUyRmRlcmVrcHJ1c2tpLnN1YnN0YWNrLmNvbSUyRnAlMkZ3=
aGF0cy1uZXctb24tcGVwdGlkZXByaWNlLXBheW1lbnQmcj00aXdvZTYmdG9rZW49ZXlKMWMyVnl=
YMmxrSWpveU56TTJNakl6T1Rnc0ltbGhkQ0k2TVRjM09EUTFNVEF4TWl3aVpYaHdJam94TnpneE=
1EUXpNREV5TENKcGMzTWlPaUp3ZFdJdE16TTJOVE0yTnlJc0luTjFZaUk2SW1Ob1pXTnJiM1YwS=
W4wLlU1R05hM0I4ZlBtRVJRcXNqSHlOWXZOWXhjU2hSbThiWDdmbldfdk1hNkEiLCJwIjoxOTcx=
NDk3OTMsInMiOjMzNjUzNjcsImYiOnRydWUsInUiOjI3MzYyMjM5OCwiaWF0IjoxNzc4NDUxMDE=
yLCJleHAiOjIwOTQwMjcwMTIsImlzcyI6InB1Yi0wIiwic3ViIjoibGluay1yZWRpcmVjdCJ9.q=
-0elJOsg909tVdJX4ZfPBuXSTN2iPh_VRzr3H49ENY?&utm_source=3Dsubstack&utm_mediu=
m=3Demail&utm_content=3Dpostcta" style=3D"font-family: system-ui,-apple-sys=
tem,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif,'Apple =
Color Emoji','Segoe UI Emoji','Segoe UI Symbol';display: inline-block;box-s=
izing: border-box;cursor: pointer;border: none;height: 40px;border-radius: =
8px;font-size: 14px;line-height: 20px;font-weight: 600;text-align: center;p=
adding: 10px 20px;margin: 0;opacity: 1;outline: none;white-space: nowrap;co=
lor: #ffffff !important;text-decoration: none !important;background-color: =
#FF6719;">Upgrade to paid</a></p></div><table class=3D"email-ufi-2-bottom" =
role=3D"presentation" width=3D"100%" border=3D"0" cellspacing=3D"0" cellpad=
ding=3D"0" style=3D"border-top: 1px solid rgb(0,0,0,.1);border-bottom: 1px =
solid rgb(0,0,0,.1);min-width: 100%;"><tbody><tr height=3D"16"><td height=
=3D"16" style=3D"font-size:0px;line-height:0;">&nbsp;</td></tr><tr><td><tab=
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