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[159.112.244.31]) by mx.google.com with UTF8SMTPS id af79cd13be357-8d0280a5c23si292683185a.410.2026.03.28.08.54.27 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 28 Mar 2026 08:54:27 -0700 (PDT) Received-SPF: pass (google.com: domain of bounce+30b528.39b08c6-tjphuhs=gmail.com@mg-d1.substack.com designates 159.112.244.31 as permitted sender) client-ip=159.112.244.31; Authentication-Results: mx.google.com; dkim=pass header.i=@mg-d1.substack.com header.s=k1 header.b=GX48EYgT; dkim=pass header.i=@mailgun.org header.s=mg header.b="UeAvNf1/"; spf=pass (google.com: domain of bounce+30b528.39b08c6-tjphuhs=gmail.com@mg-d1.substack.com designates 159.112.244.31 as permitted sender) smtp.mailfrom="bounce+30b528.39b08c6-tjphuhs=gmail.com@mg-d1.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-d1.substack.com; q=dns/txt; s=k1; t=1774713267; x=1774720467; 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=aUy1TGiMdJgqBNnszp84og+jGYVmNHSsYYnPHsIi6c0=; b=GX48EYgTB+KdZZHrQcYl9mykjhXzw6VRTX9i5Wvqa8awRvTDgmbJrhpspxYWIornl1zo56TUOVABMLroGi46y5MjNekQlSMIBWuJl6oJ2j3Rrwg5LDxWnyXRwf5tGFXg93jaAg/1QW/0Q9GY7rkOAC+2JfyF3nCvrsglr4jZW5c= DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mailgun.org; q=dns/txt; s=mg; t=1774713267; x=1774720467; 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=aUy1TGiMdJgqBNnszp84og+jGYVmNHSsYYnPHsIi6c0=; b=UeAvNf1/Btb30N6Q7n1GJlwR9RxBwWbOgumGT9BLDWGjyfdrU9GbaWNZazUbr8LbnlpKtWR2NXiaoFMBhJs0idj456ruXHEJeZ0xdjhTc9wAjG3NWpg+e4isQV1qYPGUdAZjKTdFjUgQCsWi0zjYJ6Orkm+uwjTUD8QFzyf4cZU= X-Mailgun-Sid: WyIxMWU0ZSIsInRqcGh1aHNAZ21haWwuY29tIiwiMzliMDhjNiJd X-Feedback-Id: postmaster@mg-d1.substack.com:post:614a1297c57bbbe25fa40e08:mailgun Received: by af470d02e2da72d49eb32479faf05940b650a162daa91cf64b9b195488486176 with HTTP id 69c7f9b330bb068c5bfdb1b1; Sat, 28 Mar 2026 15:54:27 GMT X-Mailgun-Sending-Ip: 159.112.244.31 Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="c1d823afce8f7cb58c9fad56ee03686a06d73ec79e7f40e85fbee79fa6df" Subject: Why Some Peptides Sting More Than Others: The pH Explanation From: Derek from Peptide Price To: tjphuhs@gmail.com X-Mailgun-Tag: post X-Mailgun-Track-Clicks: false Message-Id: <20260328155420.3.c2db0fbbadbefcc5@mg-d1.substack.com> Date: Sat, 28 Mar 2026 15:54:20 +0000 Feedback-Id: post-192425648: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": "1774713267644", "is_freemail": "true", "post_audience": "everyone", "post_id": "192425648", "post_type": "newsletter", "pub_community_enabled": "true", "publication_id": "3365367", "subdomain": "derekpruski", "user_id": "273622398"} --c1d823afce8f7cb58c9fad56ee03686a06d73ec79e7f40e85fbee79fa6df 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-some-pe= ptides-sting-more-than If your RS has ever administered GHK-Cu and felt a noticeable burn, you=E2= =80=99re not imagining it =E2=80=94 and you=E2=80=99re not doing anything w= rong. The stinging sensation some research subjects experience with certain= peptides comes down to chemistry. Specifically, pH. What is pH? pH is a scale from 0 to 14 that measures how acidic or alkaline a solution = is. Pure water sits at 7 =E2=80=94 neutral. Anything below 7 is acidic. Any= thing above 7 is alkaline. Your body=E2=80=99s subcutaneous tissue maintains a pH of roughly 7.0 to 7.= 4. When your RS administers a solution that differs significantly from that= range =E2=80=94 especially on the acidic side =E2=80=94 the tissue respond= s. The further the solution=E2=80=99s pH sits from that window, the more ir= ritation your RS tends to feel. That=E2=80=99s the entire mechanism. The mo= re acidic the reconstituted solution, the more the tissue registers it as a= mismatch, and the more your RS feels it. The Compounds and Their Approximate pH These are estimates based on known chemistry and formulation norms. Your ac= tual reconstituted solution will vary based on the peptide batch, the bacte= riostatic water used, and your dilution ratio. Think of these as reasonable= ballparks, not precise measurements. NAD+ =E2=80=94 approximately 2.5 to 4.0 NAD+ sits at the top of the stinging list for a reason. It is notably acidi= c in solution, often landing in the 2.5 to 4.0 range. That puts it well out= side the tissue pH window of 7.0 to 7.4 =E2=80=94 a significant gap by any = measure. The burn commonly reported with NAD+ is among the most notable in = research contexts, and the pH explains exactly why. GHK-Cu =E2=80=94 approximately 3.5 to 5.0 GHK-Cu (copper tripeptide-1) is another commonly reported compound on the s= tinging end of the spectrum. The copper ion bound to the tripeptide chain i= nfluences the compound=E2=80=99s chemistry and typically places the reconst= ituted solution in the 3.5 to 5.0 range. That=E2=80=99s acidic enough to cr= eate a meaningful gap from tissue pH and produce noticeable irritation in m= any RS. Some batches and dilutions may come in closer to 5.0 and feel milde= r. Others sit lower and sting more. Tesamorelin =E2=80=94 approximately 4.5 to 6.0 Tesamorelin is a 44 amino acid GHRH analog =E2=80=94 meaning it mimics the = hormone that signals the pituitary to release growth hormone. Its solutions= typically land in the 4.5 to 6.0 range. At the higher end of that window i= t begins approaching a more tolerable distance from tissue pH, which is why= some RS report minimal sensation while others notice it more. Batch variat= ion here matters quite a bit. MOTS-c =E2=80=94 approximately 5.0 to 6.5 MOTS-c is a mitochondria-derived peptide involved in cellular energy regula= tion. Its pH in solution tends to fall in the 5.0 to 6.5 range, which is st= ill below tissue pH but meaningfully less acidic than the compounds above. = This is why MOTS-c sits at the lower end of the stinging scale for most RS.= Some will feel nothing, some a mild sensation =E2=80=94 and that variabili= ty tracks directly with where the final solution=E2=80=99s pH lands. The Bacteriostatic Water Variable This part doesn=E2=80=99t get discussed enough. Bacteriostatic water =E2=80=94 used to reconstitute lyophilized (freeze-dri= ed) peptides =E2=80=94 is not pH neutral. It contains benzyl alcohol as a p= reservative, and its pH can range from roughly 4.5 to 7.0 depending on the = manufacturer and batch. When your RS reconstitutes a peptide, two things with their own pH are bein= g combined: the peptide powder as it dissolves, and the bacteriostatic wate= r. The final solution lands somewhere between the two, influenced by both. = This means the same peptide from the same vendor can produce different fina= l pH levels depending on which bacteriostatic water was used, what batch it= came from, and how much water was used relative to the peptide. Tracking down a precise pH number for a specific reconstituted solution isn= =E2=80=99t practical without specialized equipment. What you can take from = this mechanistically: your final solution has a pH that=E2=80=99s the produ= ct of two variables, both of which shift batch to batch. That=E2=80=99s why= RS reports on stinging are inconsistent even with the same compound. Why Some Research Subjects Feel Nothing Two RS use the same compound =E2=80=94 one reports a noticeable burn, the o= ther feels nothing. Both are accurate. Your RS=E2=80=99s baseline tissue pH isn=E2=80=99t a fixed number. It sits = in the 7.0 to 7.4 range on average, but it shifts based on factors that are= easy to overlook. Hydration is one of the biggest =E2=80=94 well-hydrated = tissue maintains a more stable pH environment, while dehydration concentrat= es the surrounding fluid and can shift that baseline. Ambient temperature m= atters too. Cold, dry environments reduce moisture in tissue, which affects= local pH. Warm, humid conditions tend to keep things more stable. Recent e= xercise, overall health status, and even time of day can all contribute min= or shifts to where your RS=E2=80=99s tissue pH sits at the moment of admini= stration. Some RS also simply run on the lower end of normal tissue pH range. If thei= r baseline sits closer to 7.0 rather than 7.4, a solution coming in at 5.5 = to 6.0 creates a smaller gap than it would for someone sitting higher. For = those RS, compounds like tesamorelin or MOTS-c may produce no perceptible r= esponse at all. It=E2=80=99s not toughness. It=E2=80=99s not tolerance. It=E2=80=99s where = their baseline happens to fall =E2=80=94 and how much the solution=E2=80=99= s pH deviates from it on that particular day, with that particular batch, r= econstituted with that particular bacteriostatic water. A Note on Nasal Spray Administration For RS using these compounds via nasal spray rather than standard administr= ation, the same pH mechanism applies =E2=80=94 but the reference point chan= ges. Nasal mucosal tissue maintains a pH of roughly 5.5 to 6.5, with resear= ch placing the average baseline around 6.3. That=E2=80=99s meaningfully mor= e acidic than subcutaneous tissue, which is why some compounds that sting s= ignificantly during standard administration may feel milder as a nasal spra= y =E2=80=94 the mucosal environment is naturally closer to where those solu= tions land in pH. NAD+ is the exception. Its estimated pH of 2.5 to 4.0 sits well outside eve= n the nasal mucosa=E2=80=99s natural range, and significant irritation with= nasal spray administration is widely reported in research contexts for thi= s reason. The same variables apply here as well =E2=80=94 hydration, ambient temperat= ure, and individual baseline nasal pH all influence how much a given RS fee= ls. Nasal pH has been shown to range from as low as 5.17 to as high as 8.13= across individuals, meaning two RS using the same nasal spray formulation = can have genuinely different experiences based purely on their baseline. Unsubscribe https://substack.com/redirect/2/eyJlIjoiaHR0cHM6Ly9kZXJla3BydXN= raS5zdWJzdGFjay5jb20vYWN0aW9uL2Rpc2FibGVfZW1haWw_dG9rZW49ZXlKMWMyVnlYMmxrSW= pveU56TTJNakl6T1Rnc0luQnZjM1JmYVdRaU9qRTVNalF5TlRZME9Dd2lhV0YwSWpveE56YzBOe= kV6TWpZM0xDSmxlSEFpT2pFNE1EWXlORGt5Tmpjc0ltbHpjeUk2SW5CMVlpMHpNelkxTXpZM0lp= d2ljM1ZpSWpvaVpHbHpZV0pzWlY5bGJXRnBiQ0o5LkV5RE02THlaQmRrZTdCX1FiaV9namxhVlJ= DY1AxZjRTLTBnZnBxQTRGNlkiLCJwIjoxOTI0MjU2NDgsInMiOjMzNjUzNjcsImYiOnRydWUsIn= UiOjI3MzYyMjM5OCwiaWF0IjoxNzc0NzEzMjY3LCJleHAiOjIwOTAyODkyNjcsImlzcyI6InB1Y= i0wIiwic3ViIjoibGluay1yZWRpcmVjdCJ9.hV413EYyXJQDIOCAGN5Pt6y-tPHlUprg99pdSTQ= 9ltY? --c1d823afce8f7cb58c9fad56ee03686a06d73ec79e7f40e85fbee79fa6df Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Why Some Peptides Sting = More Than Others: The pH Explanation3D""
If your RS has ever administered GHK-Cu and felt a noticeable burn,= you’re not imagining it — and you’re not doing anything = wrong.
͏     ­͏     ­͏ &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; ­͏     ­͏     ­͏ =     ­͏     ­͏     = 3;͏     ­͏     ­
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Why Some Peptides Sting More T= han Others: The pH Explanation

= =
Derek
=
 
3D""
3D""
<= /td>
3D""
<= /td><= /tbody>
3D""
=
READ IN APP3D""
 

If your RS has ever administered = GHK-Cu and felt a noticeable burn, you’re not imagining it — an= d you’re not doing anything wrong. The stinging sensation some resear= ch subjects experience with certain peptides comes down to chemistry. Speci= fically, pH.

What is pH?

pH is a scale from 0 to 14 th= at measures how acidic or alkaline a solution is. Pure water sits at 7 R= 12; neutral. Anything below 7 is acidic. Anything above 7 is alkaline.

<= p style=3D"margin: 0 0 20px 0;color: rgb(54,55,55);line-height: 26px;font-s= ize: 16px;">Your body’s subcutaneous tissue maintains a pH of roughly= 7.0 to 7.4. When your RS administers a solution that differs significantly= from that range — especially on the acidic side — the tissue r= esponds. The further the solution’s pH sits from that window, the mor= e irritation your RS tends to feel. That’s the entire mechanism. The = more acidic the reconstituted solution, the more the tissue registers it as= a mismatch, and the more your RS feels it.

The Compo= unds and Their Approximate pH

These are estimates = based on known chemistry and formulation norms. Your actual reconstituted s= olution will vary based on the peptide batch, the bacteriostatic water used= , and your dilution ratio. Think of these as reasonable ballparks, not prec= ise measurements.

NAD+ — approximately 2.5 to= 4.0

NAD+ sits at the top of the stinging list for= a reason. It is notably acidic in solution, often landing in the 2.5 to 4.= 0 range. That puts it well outside the tissue pH window of 7.0 to 7.4 ̵= 2; a significant gap by any measure. The burn commonly reported with NAD+ i= s among the most notable in research contexts, and the pH explains exactly = why.

GHK-Cu — approximately 3.5 to 5.0

GHK-Cu (copper tripeptide-1) is another commonly reporte= d compound on the stinging end of the spectrum. The copper ion bound to the= tripeptide chain influences the compound’s chemistry and typically p= laces the reconstituted solution in the 3.5 to 5.0 range. That’s acid= ic enough to create a meaningful gap from tissue pH and produce noticeable = irritation in many RS. Some batches and dilutions may come in closer to 5.0= and feel milder. Others sit lower and sting more.

= Tesamorelin — approximately 4.5 to 6.0

Tesam= orelin is a 44 amino acid GHRH analog — meaning it mimics the hormone= that signals the pituitary to release growth hormone. Its solutions typica= lly land in the 4.5 to 6.0 range. At the higher end of that window it begin= s approaching a more tolerable distance from tissue pH, which is why some R= S report minimal sensation while others notice it more. Batch variation her= e matters quite a bit.

MOTS-c — approximately= 5.0 to 6.5

MOTS-c is a mitochondria-derived pepti= de involved in cellular energy regulation. Its pH in solution tends to fall= in the 5.0 to 6.5 range, which is still below tissue pH but meaningfully l= ess acidic than the compounds above. This is why MOTS-c sits at the lower e= nd of the stinging scale for most RS. Some will feel nothing, some a mild s= ensation — and that variability tracks directly with where the final = solution’s pH lands.

3D""=
<= /div>

The Bacteriostatic Water Variable

This part doesn’t get discussed enough.

Bacte= riostatic water — used to reconstitute lyophilized (freeze-dried) pep= tides — is not pH neutral. It contains benzyl alcohol as a preservati= ve, and its pH can range from roughly 4.5 to 7.0 depending on the manufactu= rer and batch.

When your RS reconstitutes a peptide, two th= ings with their own pH are being combined: the peptide powder as it dissolv= es, and the bacteriostatic water. The final solution lands somewhere betwee= n the two, influenced by both. This means the same peptide from the same ve= ndor can produce different final pH levels depending on which bacteriostati= c water was used, what batch it came from, and how much water was used rela= tive to the peptide.

Tracking down a precise pH number for = a specific reconstituted solution isn’t practical without specialized= equipment. What you can take from this mechanistically: your final solutio= n has a pH that’s the product of two variables, both of which shift b= atch to batch. That’s why RS reports on stinging are inconsistent eve= n with the same compound.

Why Some Research Subjects = Feel Nothing

Two RS use the same compound — = one reports a noticeable burn, the other feels nothing. Both are accurate.<= /p>

Your RS’s baseline tissue pH isn’t a fixed numb= er. It sits in the 7.0 to 7.4 range on average, but it shifts based on fact= ors that are easy to overlook. Hydration is one of the biggest — well= -hydrated tissue maintains a more stable pH environment, while dehydration = concentrates the surrounding fluid and can shift that baseline. Ambient tem= perature matters too. Cold, dry environments reduce moisture in tissue, whi= ch affects local pH. Warm, humid conditions tend to keep things more stable= =2E Recent exercise, overall health sta= tus, and even time of day can all cont= ribute minor shifts to where your RS’s tissue pH sits at the moment o= f administration.

Some RS also simply run on the lower end = of normal tissue pH range. If their baseline sits closer to 7.0 rather than= 7.4, a solution coming in at 5.5 to 6.0 creates a smaller gap than it woul= d for someone sitting higher. For those RS, compounds like tesamorelin or M= OTS-c may produce no perceptible response at all.

It’= s not toughness. It’s not tolerance. It’s where their baseline = happens to fall — and how much the solution’s pH deviates from = it on that particular day, with that particular batch, reconstituted with t= hat particular bacteriostatic water.

A Note on Nasal = Spray Administration

For RS using these compounds = via nasal spray rather than standard administration, the same pH mechanism = applies — but the reference point changes. Nasal mucosal tissue maint= ains a pH of roughly 5.5 to 6.5, with research placing the average baseline= around 6.3. That’s meaningfully more acidic than subcutaneous tissue= , which is why some compounds that sting significantly during standard admi= nistration may feel milder as a nasal spray — the mucosal environment= is naturally closer to where those solutions land in pH.

N= AD+ is the exception. Its estimated pH of 2.5 to 4.0 sits well outside even= the nasal mucosa’s natural range, and significant irritation with na= sal spray administration is widely reported in research contexts for this r= eason.

The same variables apply here as well — hydrat= ion, ambient temperature, and individual baseline nasal pH all influence ho= w much a given RS feels. Nasal pH has been shown to range from as low as 5.= 17 to as high as 8.13 across individuals, meaning two RS using the same nas= al spray formulation can have genuinely different experiences based purely = on their baseline.

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