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[159.112.244.33]) by mx.google.com with UTF8SMTPS id af79cd13be357-8cfc911991esi1706759285a.368.2026.03.24.08.15.27 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 24 Mar 2026 08:15:27 -0700 (PDT) Received-SPF: pass (google.com: domain of bounce+91e48a.63af5d-tjphuhs=gmail.com@mg-d0.substack.com designates 159.112.244.33 as permitted sender) client-ip=159.112.244.33; Authentication-Results: mx.google.com; dkim=pass header.i=@mg-d0.substack.com header.s=mailo header.b=byETAEVB; dkim=pass header.i=@mailgun.org header.s=mg header.b="T/Witg24"; spf=pass (google.com: domain of bounce+91e48a.63af5d-tjphuhs=gmail.com@mg-d0.substack.com designates 159.112.244.33 as permitted sender) smtp.mailfrom="bounce+91e48a.63af5d-tjphuhs=gmail.com@mg-d0.substack.com"; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=substack.com DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg-d0.substack.com; q=dns/txt; s=mailo; t=1774365327; x=1774372527; h=List-Unsubscribe-Post: List-Unsubscribe: List-Post: List-Id: List-Archive: List-Owner: Reply-To: In-Reply-To: References: Sender: Sender: Date: Message-Id: To: To: From: From: Subject: Subject: Content-Type: Mime-Version: X-Feedback-Id; bh=GKoDDT+YocfaqZsEFJog548lteKmiQ2C9Sv89uZ2Cr0=; b=byETAEVBvTn4cKcCmraqS1y1YkNWSFJxG+PTrKWaTdhINiBCcc6Lv0aVpuTBjbkNhivx24f1KNPAvKDKdK23ppkmVYdLGN0tY5yssuD+aT1S6vvJeud1QhHGc+Fg3uSDWqn3zwbXiksnprjXP5lyH29MW7bW1OEjIWmZBUuSFq8= DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mailgun.org; q=dns/txt; s=mg; t=1774365327; x=1774372527; h=List-Unsubscribe-Post: List-Unsubscribe: List-Post: List-Id: List-Archive: List-Owner: Reply-To: In-Reply-To: References: Sender: Sender: Date: Message-Id: To: To: From: From: Subject: Subject: Content-Type: Mime-Version: X-Feedback-Id; bh=GKoDDT+YocfaqZsEFJog548lteKmiQ2C9Sv89uZ2Cr0=; b=T/Witg24+GYIMNgw5x7wSpWpo3GS+0US7dMX7kM5UfJESxVkut4c67duknu8LiJtushCuKLvYiGLTKA5i9Cj3kebmbro1HZ4PLvTGeXtlyZPRedVLrtyJR9sope/GjOSmON/z5b1x6OvmMIsCYtSxJeWWqwAXoetSHta15dEGiw= X-Mailgun-Sid: WyJkZWU4NyIsInRqcGh1aHNAZ21haWwuY29tIiwiNjNhZjVkIl0= X-Feedback-Id: postmaster@mg-d0.substack.com:post:6148c7d8a45790427cda307f:mailgun Received: by 937f85aaf1ae53c3608df0d52429b04e06857cd08624022cab69d10ddc983e82 with HTTP id 69c2aa8ffb29a309a896d3ea; Tue, 24 Mar 2026 15:15:27 GMT X-Mailgun-Sending-Ip: 159.112.244.33 Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="567c27374eee51e62340a5db3c771811aca06e5b2d82996ce135017c5e68" Subject: Introducing Peptidology: Testing Taken To A New Level From: Derek from Peptide Price To: tjphuhs@gmail.com X-Mailgun-Tag: post X-Mailgun-Track-Clicks: false Message-Id: <20260324151515.3.59331559ad0f3aa2@mg-d0.substack.com> Date: Tue, 24 Mar 2026 15:15:15 +0000 Feedback-Id: post-191991154:cat-post:pub-3365367:substack Sender: Derek from Peptide Price References: In-Reply-To: Reply-To: Derek from Peptide Price List-Owner: List-Url: List-Archive: List-Id: List-Post: List-Unsubscribe: List-Unsubscribe-Post: List-Unsubscribe=One-Click X-Mailgun-Variables: {"category": "post", "email_generated_at": "1774365327137", "is_freemail": "true", "post_audience": "everyone", "post_id": "191991154", "post_type": "newsletter", "pub_community_enabled": "true", "publication_id": "3365367", "subdomain": "derekpruski", "user_id": "273622398"} --567c27374eee51e62340a5db3c771811aca06e5b2d82996ce135017c5e68 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable View this post on the web at https://derekpruski.substack.com/p/introducing= -peptidology-testing-taken Without question the best-tested company I=E2=80=99ve come across in this s= pace =E2=80=94 and one of the first to do it at this level. Peptidology takes a different approach to the research space. Their goal is= to do the maximum amount of testing possible to ensure their products are = the highest quality. Most vendors stop at purity. Peptidology doesn=E2=80= =99t. Here=E2=80=99s what they test for on every batch: Net content Net purity Endotoxins Heavy metals Sterility Double sterility That last one is worth unpacking. They send samples to two entirely separat= e laboratories to confirm sterility passes =E2=80=94 because sterility is t= he most critical and most overlooked area of testing in this space. Their p= rimary testing goes through Vanguard, and then a second sample is sent to E= agle Analytical, a company that works directly with compounding pharmacies = and holds ISO certification. I spoke with the owner personally. He will not sell a single product withou= t it passing every one of these tests. His words: he dumps more products th= an he keeps because they don=E2=80=99t clear the sterility screen. Think ab= out what that means for the products that do make it out the door. More posts are coming that go deeper on what all of this means in practice.= I=E2=80=99ll also be doing a dedicated post on why bioburdens testing is n= ot the same as sterility testing =E2=80=94 that distinction matters more th= an most people realize, and it=E2=80=99ll make a lot more sense once we wal= k through it. A note on their blends I want to highlight some of their formulations, because I haven=E2=80=99t s= een anything like this before in the research space. Full unboxing below of= a few I got my hands on: Thymosin Alpha 1 + Thymulin =E2=80=94 10mg + 10mg (20mg total) BPC-157, TB-500 & Cartalax =E2=80=94 12mg + 12mg + 12mg (36mg total) What to expect when shopping Their catalog will frequently show out-of-stock items, and restocks take lo= nger than most vendors. That=E2=80=99s a direct result of the testing proce= ss =E2=80=94 every batch takes 14=E2=80=9318 days to clear before it can be= sold. They=E2=80=99re spending over $2,000 in testing per batch, and for f= uture batches they=E2=80=99re sending in up to 20 vials for sterility testi= ng alone. That=E2=80=99s not a vendor cutting corners to move product fast. That=E2= =80=99s a vendor that=E2=80=99s built their entire operation around getting= it right. Code DEREK is live at Peptidology for 15% off. https://peptidology.co/?ref=3Dmxxyvdne [ https://substack.com/redirect/b720= 91c4-70de-4754-89b9-65285477860e?j=3DeyJ1IjoiNGl3b2U2In0.sVDxRtmZ85v8kfdamY= 0krRXGMy3p768BWtuZifRB-Zs ] Peptidology exemplifies exactly what the price tool was built to highlight = =E2=80=94 vendors who invest in transparency and accountability, not just t= he ones with the lowest price. There will be more posts on this company bec= ause there is genuinely a lot more to cover. All products are for research use only, not for human consumption. Compare = prices at peptideprice.store [ https://substack.com/redirect/60762d03-eebf-= 4a7e-b154-d1e0fc1ed9e6?j=3DeyJ1IjoiNGl3b2U2In0.sVDxRtmZ85v8kfdamY0krRXGMy3p= 768BWtuZifRB-Zs ]. Unsubscribe https://substack.com/redirect/2/eyJlIjoiaHR0cHM6Ly9kZXJla3BydXN= raS5zdWJzdGFjay5jb20vYWN0aW9uL2Rpc2FibGVfZW1haWw_dG9rZW49ZXlKMWMyVnlYMmxrSW= pveU56TTJNakl6T1Rnc0luQnZjM1JmYVdRaU9qRTVNVGs1TVRFMU5Dd2lhV0YwSWpveE56YzBNe= lkxTXpJM0xDSmxlSEFpT2pFNE1EVTVNREV6TWpjc0ltbHpjeUk2SW5CMVlpMHpNelkxTXpZM0lp= d2ljM1ZpSWpvaVpHbHpZV0pzWlY5bGJXRnBiQ0o5LkoyQktwcnVGVGt1Q2F5R0FmT0lGeXVGb0t= WU1RUVkZZeElncnZkOEdDSjQiLCJwIjoxOTE5OTExNTQsInMiOjMzNjUzNjcsImYiOnRydWUsIn= UiOjI3MzYyMjM5OCwiaWF0IjoxNzc0MzY1MzI3LCJleHAiOjIwODk5NDEzMjcsImlzcyI6InB1Y= i0wIiwic3ViIjoibGluay1yZWRpcmVjdCJ9.SmhHci0shaGVSXcA2l_mT3KvYock75aGkyLijml= 64zY? --567c27374eee51e62340a5db3c771811aca06e5b2d82996ce135017c5e68 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Introducing Peptidology:= Testing Taken To A New Level3D""
Without question the best-tested company I’ve come across in = this space — and one of the first to do it at this level.
͏ &nb= sp;   ­͏     ­͏     ­&= #847;     ­͏     ­͏    = ; ­͏     ­͏     ­͏ &nbs= p;   ­͏     ­͏     ­&#= 847;     ­͏     ­͏    = ­͏     ­͏     ­͏  = ;   ­͏     ­͏     ­= 47;     ­͏     ­͏     = ­͏     ­͏     ­͏  =   ­͏     ­͏     ­T= 7;     ­͏     ­͏     &= #173;͏     ­͏     ­͏   =   ­͏     ­͏     ­͏= ;     ­͏     ­͏     &#= 173;͏     ­͏     ­͏   &= #8199; ­͏     ­͏     ­͏=     ­͏     ­͏     = 73;͏     ­͏     ­͏   &#= 8199; ­͏     ­͏     ­͏ =     ­͏     ­͏     = 3;͏     ­͏     ­͏   = 199; ­͏     ­͏     ­͏ &= nbsp;   ­͏     ­͏     ­= ;͏     ­͏     ­͏   Q= 99; ­͏     ­͏     ­͏ &n= bsp;   ­͏     ­͏     ­= ͏     ­͏     ­͏   ̳= 9; ­͏     ­͏     ­͏ &nb= sp;   ­͏     ­͏     ­&= #847;     ­͏     ­͏    = ; ­͏     ­͏     ­͏ &nbs= p;   ­͏     ­͏     ­&#= 847;     ­͏     ­͏    = ­͏     ­͏     ­͏  = ;   ­͏     ­͏     ­= 47;     ­͏     ­͏     = ­͏     ­͏     ­͏  =   ­͏     ­͏     ­T= 7;     ­͏     ­͏     &= #173;͏     ­͏     ­͏   =   ­͏     ­͏     ­͏= ;     ­͏     ­͏     &#= 173;͏     ­͏     ­͏   &= #8199; ­͏     ­͏     ­͏=     ­͏     ­͏     = 73;͏     ­͏     ­͏   &#= 8199; ­͏     ­͏     ­͏ =     ­͏     ­͏     = 3;͏     ­͏     ­͏   = 199; ­͏     ­͏     ­͏ &= nbsp;   ­͏     ­͏     ­= ;͏     ­͏     ­͏   Q= 99; ­͏     ­͏     ­͏ &n= bsp;   ­͏     ­͏     ­= ͏     ­͏     ­͏   ̳= 9; ­͏     ­͏     ­͏ &nb= sp;   ­͏     ­͏     ­&= #847;     ­͏     ­͏    = ; ­͏     ­͏     ­͏ &nbs= p;   ­͏     ­͏     ­&#= 847;     ­͏     ­͏    = ­͏     ­͏     ­͏  = ;   ­͏     ­͏     ­= 47;     ­͏     ­͏     = ­͏     ­͏     ­͏  =   ­͏     ­͏     ­T= 7;     ­͏     ­͏     &= #173;͏     ­͏     ­͏   =   ­͏     ­͏     ­͏= ;     ­͏     ­͏     &#= 173;͏     ­͏     ­͏   &= #8199; ­͏     ­͏     ­͏=     ­͏     ­͏     = 73;͏     ­͏     ­͏   &#= 8199; ­͏     ­
Forwarded this email? Su= bscribe here for more

Introducing Peptidology: Testing Taken To= A New Level

=
=
=
Derek
 
3D""
=
3D""
=
3D""
=
3D""
READ IN APP3D""
 

Without question the be= st-tested company I’ve come across in this space — and one of t= he first to do it at this level.

Peptidology takes a differ= ent approach to the research space. Their goal is to do the maximum amount = of testing possible to ensure their products are the highest quality. Most = vendors stop at purity. Peptidology doesn’t. Here’s what they t= est for on every batch:

  • Net content

  • Net purity

  • Endotoxins

  • Heavy metals

  • Sterility

  • Double sterility

3D"image.png"
3D"image.p=
3D"image.png"

That last one is worth unpacking. = They send samples to two entirely separate laboratories to confirm sterilit= y passes — because sterility is the most critical and most overlooked= area of testing in this space. Their primary testing goes through Vanguard= , and then a second sample is sent to Eagle Analytical, a company that work= s directly with compounding pharmacies and holds ISO certification.

I spoke with the owner personally. He will not sell a single produ= ct without it passing every one of these tests. His words: he dumps more pr= oducts than he keeps because they don’t clear the sterility screen. T= hink about what that means for the products that do make it out the door.

More posts are coming that go deeper on what all of this mea= ns in practice. I’ll also be doing a dedicated post on why bioburdens= testing is not the same as sterility testing — that distinction matt= ers more than most people realize, and it’ll make a lot more sense on= ce we walk through it.

A note on their blends

I want to highlight some of their formulations, because= I haven’t seen anything like this before in the research space. Full= unboxing below of a few I got my hands on:

  • =

    Thymosin Alph= a 1 + Thymulin — 10mg + 10mg (20mg total)

  • BPC-157, TB-500 & Cartalax — 12mg = + 12mg + 12mg (36mg total)

What to expect when shop= ping

Their catalog will frequently show out-of-sto= ck items, and restocks take longer than most vendors. That’s a direct= result of the testing process — every batch takes 14–18 days t= o clear before it can be sold. They’re spending over $2,000 in testin= g per batch, and for future batches they’re sending in up to 20 vials= for sterility testing alone.

That’s not a vendor cut= ting corners to move product fast. That’s a vendor that’s built= their entire operation around getting it right.

Co= de DEREK is live at Peptidology for 15% off.

https://peptidology.co/?r= ef=3Dmxxyvdne

Peptidology exemplifies exactly what the = price tool was built to highlight — vendors who invest in transparenc= y and accountability, not just the ones with the lowest price. There will b= e more posts on this company because there is genuinely a lot more to cover= =2E

All products are for research use only, not for hum= an consumption. Compare prices at peptideprice.store.

Upgrade to paid

You're currently a free subscriber t= o Peptide Price. For the f= ull experience, upgrade your subscription.=

Upgrade to paid

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© 2026 Dere= k Pruski
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