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[159.112.244.35]) by mx.google.com with UTF8SMTPS id af79cd13be357-8d0280abe8dsi1166019285a.420.2026.03.31.07.16.05 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 31 Mar 2026 07:16:05 -0700 (PDT) Received-SPF: pass (google.com: domain of bounce+91e48a.63af5d-tjphuhs=gmail.com@mg-d0.substack.com designates 159.112.244.35 as permitted sender) client-ip=159.112.244.35; Authentication-Results: mx.google.com; dkim=pass header.i=@mg-d0.substack.com header.s=mailo header.b="gLZ/8CnT"; dkim=pass header.i=@mailgun.org header.s=mg header.b=L4kxPDjN; spf=pass (google.com: domain of bounce+91e48a.63af5d-tjphuhs=gmail.com@mg-d0.substack.com designates 159.112.244.35 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=1774966565; x=1774973765; 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=GMrgNnQ9l0jigfNeDZJmh3PrYOiIVfsBIijXsn1d4u0=; b=gLZ/8CnT2+xYmuCPuYBcflRAOqjyVC3zfW5EH2XHFl7hH36qBT6Wam+2qB2IYWHoD1jGtepIEhoxcmnuCPofGP/qK5I6Jtw3452OYLL3uECbuzl4Ni3RdfrFL4//3TE4epaxXDS/axatgDOAQdMo2mzC0f244xrrNw7uW+LGa90= DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mailgun.org; q=dns/txt; s=mg; t=1774966565; x=1774973765; 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=GMrgNnQ9l0jigfNeDZJmh3PrYOiIVfsBIijXsn1d4u0=; b=L4kxPDjNo9N4Gn6LwJeoptN4BiFEqSvAOktLKypXnQ56GY5zCHs/rvsDO56lxpg2ryv+X6+KSbhgBfN8YJwHIDuzAakf1NQnGJGJljbrwYAV5vfdPUD8tD5Gc7PRcw+9iKQlA8yfO7/+SNcQ+AFqAxqoR9XlXUnf2wu+Jne8KfM= X-Mailgun-Sid: WyJkZWU4NyIsInRqcGh1aHNAZ21haWwuY29tIiwiNjNhZjVkIl0= X-Feedback-Id: postmaster@mg-d0.substack.com:post:6148c7d8a45790427cda307f:mailgun Received: by 35cf7a9f2a60670559cdb012ae4b0ed69a56b7b4d844ff682c1d90831b65aff8 with HTTP id 69cbd724f51869173ac4ddd0; Tue, 31 Mar 2026 14:16:04 GMT X-Mailgun-Sending-Ip: 159.112.244.35 Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="1049d9373d3df619182925dcfb85ef0958082975da466464d5c86532d8bb" Subject: Why You Shouldn't Blend Your Own Peptides From: Derek from Peptide Price To: tjphuhs@gmail.com X-Mailgun-Tag: post X-Mailgun-Track-Clicks: false Message-Id: <20260331141558.3.97cbbef0120015cb@mg-d0.substack.com> Date: Tue, 31 Mar 2026 14:15:58 +0000 Feedback-Id: post-192735380: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": "1774966564465", "is_freemail": "true", "post_audience": "everyone", "post_id": "192735380", "post_type": "newsletter", "pub_community_enabled": "true", "publication_id": "3365367", "subdomain": "derekpruski", "user_id": "273622398"} --1049d9373d3df619182925dcfb85ef0958082975da466464d5c86532d8bb Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable View this post on the web at https://derekpruski.substack.com/p/why-you-sho= uldnt-blend-your-own-peptides Quick transparency note before we get into this: I=E2=80=99m actively worki= ng on putting together a more formal study on this topic. What I=E2=80=99m = sharing here is based on current science and reasoning =E2=80=94 the goal i= s to eventually confirm whether this is myth or reality with real data. But= based on what we know right now, there are enough red flags to warrant cau= tion. First, how do pre-blended peptides actually stay stable? When a vendor lyophilizes (freeze-dries) peptides together into a single bl= end, the formulation is engineered as a system. The pH, excipients, and env= ironment are all dialed in together so the final powder is stable at room t= emperature and reconstitutes predictably. That stability is intentional. It doesn=E2=80=99t happen by accident. The problem with DIY blending When you buy two individual peptides from two separate vials and mix them y= ourself after reconstitution, you=E2=80=99re combining: Two different sterile environments Two different pH levels An unknown interaction with the bacteriostatic water introduced into each Each of those variables introduces uncertainty. Combined, they can create r= eal problems. pH =E2=80=94 what it is and why it matters pH is a measure of how acidic or alkaline a solution is, on a scale of 0=E2= =80=9314. Most peptides are stable only within a narrow pH window. Drift to= o far outside that range and you can see degradation, structural changes, o= r loss of potency. Here=E2=80=99s where it gets tricky: different peptides have very different= pH requirements. BPC-157 is typically stable at a slightly acidic pH, around 4.5=E2=80=936 GHK-Cu is most stable at a physiological pH of 6.5=E2=80=937.5, where it re= mains effective for tissue repair and collagen synthesis. It can tolerate a= broader range of 4.5=E2=80=937.4, but drop below pH 4 and it starts to dis= sociate =E2=80=94 meaning it releases free copper into the solution rather = than staying intact as a copper peptide complex Those two peptides already want to sit in meaningfully different places on = the pH scale. When you combine them after reconstitution, the resulting pH = is unknown. You don=E2=80=99t know where it lands without testing it. And i= f the combined pH pushes GHK-Cu outside its stable window, you=E2=80=99re n= o longer working with an intact peptide. Bacteriostatic water isn=E2=80=99t a neutral variable Most people assume bac water is just water. It=E2=80=99s not =E2=80=94 it c= ontains 0.9% benzyl alcohol as a preservative, and its pH can shift differe= ntly depending on which peptide and environment it=E2=80=99s introduced int= o. A study looking at peptide crafter bacteriostatic water found that pH va= lues were all over the place across different batches and suppliers. So even before mixing, the water used to reconstitute each peptide is alrea= dy interacting with each one differently. Combine those two reconstituted s= olutions and the final pH of the blend is genuinely unpredictable. What can actually go wrong When pH goes outside the stable range for a peptide, a few things can happe= n: Gelling =E2=80=94 the solution thickens or becomes viscous, a sign the pept= ide structure is being disrupted Cloudiness =E2=80=94 a reconstituted peptide should be clear; cloudiness of= ten signals aggregation or precipitation, meaning the peptide is clumping r= ather than staying in solution Degradation =E2=80=94 the peptide bonds themselves can break down, reducing= potency or creating unknown byproducts Free copper release =E2=80=94 specific to GHK-Cu, if pH drops too far the c= opper dissociates from the peptide complex entirely, which changes what you= =E2=80=99re actually working with Loss of sterility integrity =E2=80=94 every time you introduce a new vial i= nto another, you=E2=80=99re creating an opportunity for contamination None of these are guaranteed to happen. But none of them are impossible eit= her, and right now we don=E2=80=99t have enough data to know how often they= do. The bottom line If you need a blend, buy one that was formulated together from the start. V= endors who produce blends are doing it in controlled environments with the = pH, stability, and sterility already accounted for. DIY blending after reconstitution is taking a formulated product, stripping= away the controls that make it stable, and hoping the outcome is fine. Tha= t=E2=80=99s not a great research framework. I=E2=80=99ll share more as the study work progresses. In the meantime, keep= your peptides separate unless they came blended from the source. All research use only. Not for human consumption. Unsubscribe https://substack.com/redirect/2/eyJlIjoiaHR0cHM6Ly9kZXJla3BydXN= raS5zdWJzdGFjay5jb20vYWN0aW9uL2Rpc2FibGVfZW1haWw_dG9rZW49ZXlKMWMyVnlYMmxrSW= pveU56TTJNakl6T1Rnc0luQnZjM1JmYVdRaU9qRTVNamN6TlRNNE1Dd2lhV0YwSWpveE56YzBPV= FkyTlRZMExDSmxlSEFpT2pFNE1EWTFNREkxTmpRc0ltbHpjeUk2SW5CMVlpMHpNelkxTXpZM0lp= d2ljM1ZpSWpvaVpHbHpZV0pzWlY5bGJXRnBiQ0o5LjlWOXBkY1Nkd1pEaUZ6WnVlOGxpa1VyRlh= XdzdTLUhENExSM3RacE00U1kiLCJwIjoxOTI3MzUzODAsInMiOjMzNjUzNjcsImYiOnRydWUsIn= UiOjI3MzYyMjM5OCwiaWF0IjoxNzc0OTY2NTY0LCJleHAiOjIwOTA1NDI1NjQsImlzcyI6InB1Y= i0wIiwic3ViIjoibGluay1yZWRpcmVjdCJ9.L3nFHt6e-lnaSFMEfoJgFfNA_C5NMPe2TrKP_V3= gjTc? --1049d9373d3df619182925dcfb85ef0958082975da466464d5c86532d8bb Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Why You Shouldn't Blend = Your Own Peptides3D""
Quick transparency note before we get into this: I’m actively= working on putting together a more formal study on this topic.
͏ &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?

Why You Shouldn't Blend Your Own Pepti= des

<= td align=3D"right">
Derek
 
=3D""
= 3D""
= 3D""
READ IN APP3D""
 

Quick transparency note before we get in= to this: I’m actively working on putting together a more formal study= on this topic. What I’m sharing here is based on current science and= reasoning — the goal is to eventually confirm whether this is myth o= r reality with real data. But based on what we know right now, there are en= ough red flags to warrant caution.

<= figure style=3D"width: 100%;margin: 0 auto;"><= td style=3D"text-align: center;">
3D""
<= p style=3D"margin: 0 0 20px 0;color: rgb(54,55,55);line-height: 26px;font-s= ize: 16px;">

First, how do pre-blended peptides actua= lly stay stable?

When a vendor lyophilizes (freeze= -dries) peptides together into a single blend, the formulation is engineere= d as a system. The pH, excipients, and environment are all dialed in togeth= er so the final powder is stable at room temperature and reconstitutes pred= ictably.

That stability is intentional. It doesn’t ha= ppen by accident.

The problem with DIY blending

When you buy two individual peptides from two separate = vials and mix them yourself after reconstitution, you’re combining:

  • Two different sterile environments

  • Two different pH levels

  • An unknown interaction with the b= acteriostatic water introduced into each

Each of = those variables introduces uncertainty. Combined, they can create real prob= lems.

pH — what it is and why it matters

pH is a measure of how acidic or alkaline a solution is,= on a scale of 0–14. Most peptides are stable only within a narrow pH= window. Drift too far outside that range and you can see degradation, stru= ctural changes, or loss of potency.

Here’s where it g= ets tricky: different peptides have very different pH requirements.

  • BPC-157 is typically stable at a slightly acidic pH, around 4.5&= #8211;6

  • GHK-Cu is= most stable at a physiological pH of 6.5–7.5, where it remains effec= tive for tissue repair and collagen synthesis. It can tolerate a broader ra= nge of 4.5–7.4, but drop below pH 4 and it starts to dissociate ̵= 2; meaning it releases free copper into the solution rather than staying in= tact as a copper peptide complex

Those two peptid= es already want to sit in meaningfully different places on the pH scale. Wh= en you combine them after reconstitution, the resulting pH is unknown. You = don’t know where it lands without testing it. And if the combined pH = pushes GHK-Cu outside its stable window, you’re no longer working wit= h an intact peptide.

<= hr style=3D"margin: 32px 0;padding: 0;height: 1px;background: rgb(0,0,0,.1)= ;border: none;">

Bacteriostatic water isn’t= a neutral variable

Most people assume bac water i= s just water. It’s not — it contains 0.9% benzyl alcohol as a p= reservative, and its pH can shift differently depending on which peptide an= d environment it’s introduced into. A study looking at peptide crafte= r bacteriostatic water found that pH values were all over the place across = different batches and suppliers.

So even before mixing, the= water used to reconstitute each peptide is already interacting with each o= ne differently. Combine those two reconstituted solutions and the final pH = of the blend is genuinely unpredictable.

What can act= ually go wrong

When pH goes outside the stable ran= ge for a peptide, a few things can happen:

  • <= p style=3D"color: rgb(54,55,55);line-height: 26px;margin-bottom: 0;box-sizi= ng: border-box;padding-left: 4px;font-size: 16px;margin: 0;">Gellin= g — the solution thickens or becomes viscous, a sign t= he peptide structure is being disrupted

  • Cloudiness — a r= econstituted peptide should be clear; cloudiness often signals aggregation = or precipitation, meaning the peptide is clumping rather than staying in so= lution

  • Degradation — the peptide bonds themselves can br= eak down, reducing potency or creating unknown byproducts

    • Free copper release= — specific to GHK-Cu, if pH drops too far the copper = dissociates from the peptide complex entirely, which changes what you’= ;re actually working with

  • Loss of sterility integrity — = every time you introduce a new vial into another, you’re creating an = opportunity for contamination

None of thes= e are guaranteed to happen. But none of them are impossible either, and rig= ht now we don’t have enough data to know how often they do.

The bottom line

If you need a blend, = buy one that was formulated together from the start. Vendors who produce bl= ends are doing it in controlled environments with the pH, stability, and st= erility already accounted for.

DIY blending after reconstit= ution is taking a formulated product, stripping away the controls that make= it stable, and hoping the outcome is fine. That’s not a great resear= ch framework.

I’ll share more as the study work progr= esses. In the meantime, keep your peptides separate unless they came blende= d from the source.

All research use only. Not for human consu= mption.

Upgrade to = paid

You're= currently a free subscriber to upg= rade your subscription.

= Upgrade to paid

 
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© 2026 Derek Pruski
548 Market Stre= et PMB 72296, San Francisco, CA 94104
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