POST 19 — How to put it all together (and references for the entire guide)

The evidence across this peptide list is uneven and it’s worth being clear about where each one sits. But these peptides are considered “Biologics” and currently do not have a drug company funding studies, so for many peptides, there may not be full-fledged FDA studies. That doesn’t mean they arent tested–millions, maybe billions of people are using peptides and the numbers are growing. That’s pretty convincing.

But for the medical/science geeks out there:

Real U.S. human data: GHK-Cu, the GLP-1 class, Tesamorelin, Thymosin Alpha-1 (approved abroad).

Coherent mechanism, long real-world use, thin formal trials: BPC-157, TB-500, KPV, MOTS-c.

Approved in other countries: Semax, Selank, Epitalon. Decades of Russian research behind all three. Epitalon’s sleep effect is directly observable; its longevity claims are the part still waiting on independent confirmation.

Early and mostly preclinical: 5-Amino-1MQ, which isn’t a peptide anyway — it’s a small molecule that behaves more like a supplement.

That being said, with the advent of the massively popular gray market, there are literally millions of people using any combination of all of these peptides with no problems. That’s an unofficial Phase 3 trial, similar to what the FDA conducts right before they approve of a drug.  The useful approach is to get clear on what you’re actually trying to accomplish, find out which compounds have real support for that specific goal, insist on third-party testing and a COA for the specific lot you’re buying, and work with someone who has the background, education, and knowledge base to oversee it–not the gym dude  or health influencer online.

On labs. I run mine at least twice a year, and my doctor knows which peptides I am using, so we can look at the changes going on in my body. I recommend getting labs done if you can, mostly because bloodwork is the best way to find out whether a pep is doing anything, or whether you’re spending money for nothing. Obviously lab work may not show some of the benefits we’ve discussed, like healing tendons, better cognition, or more energy.

That said, plenty of physicians won’t touch this subject and may not welcome questions about peptides, and some will lecture you for asking–often times it’s a lack of knowledge and feeling threatened, since you can buy peptides without a dr’s help. If yours is one of them, you’re not doing anything wrong by proceeding thoughtfully on your own, doing your own research, getting educated, and getting your own labwork online.

You don’t need a doctor to get labs. Quest, Labcorp, and a number of direct-to-consumer services will run a full panel on request. You order online, walk into one of the clinical locations, get your blood drawn, and the results come back to you online. A basic metabolic panel, a lipid panel, and an A1c cost very little. If you want the markers that  matter for this, add apoB and hs-CRP, neither of which shows up on a standard lipid panel and both of which predict cardiovascular risk better than triglycerides or LDL alone. It also helps to get a full thyroid panel as well, and depending on age, I strongly recommend you get a sex hormone panel to check hormone levels, balance, etc.

Its best to get baseline levels before you start anything, then repeat a 3-4 months in. That’s how you find out whether a compound is doing what it claims.

IF YOU HAVE QUESTIONS

This covers a lot of ground, and the useful next step is usually narrowing it down rather than adding to it. Most people don’t need to try fifteen compounds, and it’s actually better to try one at a time before you add to that number so you can see exactly what your body’s reaction is. The best method if you want to try peptides is try one at a time first to determine how your body reacts and how you feel.

If something here raised a question, or you want to talk through what might make sense for a specific problem, get in touch. I’m happy to think it through with you, point you toward the research, and tell you honestly when I do or don’t don’t think something is a good idea.

Questions? Reply here or message me on FB. I’m happy to help!

PLEASE READ THIS PART

I’m a registered nurse with a master’s in public health, and I write about health research for a living. None of that means I’m your nurse or pretending to be a doctor.

This is education, not medical advice. Everything here is general information about what these compounds are, what the research shows, and what my own experience has been. It isn’t a diagnosis, a treatment plan, or a prescription, and reading it doesn’t create any kind of professional or clinical relationship between us. I haven’t examined you, I don’t know your history, your medications, your labs, or your conditions, and nothing written here accounts for any of that.

My experience is one person’s experience. Where I’ve described what I take, how I take it, or what happened to my own labs, that is an account of what I do under my own physician’s supervision. It is not a recommendation, a protocol, or a suggestion that anyone else do the same. What worked for me may do nothing for you, or may be a bad idea for you specifically. Peptide reconstitution and dose in particular are conversations for you and your own doctor, or your own careful research.

Most of these compounds are sold for research purposes and are not approved as drugs for human use. That’s the regulatory reality of this market and I’ve tried to explain it honestly rather than pretend otherwise. What you decide to do with that information is your decision and your responsibility.

Some situations genuinely warrant a physician’s input — an existing medical condition, prescription medications that could interact, a history of cancer, pregnancy or nursing, or an immune or allergic disorder. In those cases talk to someone before starting anything here.

If something in here raises a question about your own situation, that question belongs with your doctor. I’m not able to advise you on your own care, and I won’t try.

KEY REFERENCES

Not every statement in this guide is footnoted, but the central factual claims are listed here so you can read the original research rather than take my word for it. Where a claim rests on a manufacturer’s press release or a single study rather than a body of work, I’ve said so.

BPC-157 and tendon healing

Staresinic M, Sebecic B, Patrlj L, et al. Gastric pentadecapeptide BPC 157 accelerates healing of transected rat Achilles tendon and in vitro stimulates tendocytes growth. Journal of Orthopaedic Research. 2003;21(6):976-983.

Krivic A, Anic T, Seiwerth S, Huljev D, Sikiric P. Achilles detachment in rat and stable gastric pentadecapeptide BPC 157: promoted tendon-to-bone healing and opposed corticosteroid aggravation. Journal of Orthopaedic Research. 2006;24(5):982-989.

Chang CH, Tsai WC, Lin MS, Hsu YH, Pang JS. The promoting effect of pentadecapeptide BPC 157 on tendon healing involves tendon outgrowth, cell survival, and cell migration. Journal of Applied Physiology. 2011;110(3):774-780.

Chang CH, Tsai WC, Hsu YH, Pang JS. Pentadecapeptide BPC 157 enhances the growth hormone receptor expression in tendon fibroblasts. Molecules. 2014;19(11):19066-19077.

Vasireddi N, Hahamyan H, Salata MJ, et al. Emerging use of BPC-157 in orthopaedic sports medicine: a systematic review. HSS Journal. 2025.

GHK-Cu and skin

Abdulghani AA, Sherr S, Shirin S, et al. Effects of topical creams containing vitamin C, a copper-binding peptide cream and melatonin compared with tretinoin on the ultrastructure of normal skin. Disease Management and Clinical Outcomes. 1998;1(4):136-141. This is the source of the frequently cited 70% versus 50% versus 40% collagen comparison. Note the sample was small, ten subjects per arm.

Leyden J, Stephens T, Finkey MB, Barkovic S. Skin care benefits of copper peptide containing facial cream. Presented at the American Academy of Dermatology annual meeting, 2002. Twelve weeks, 71 women with photoaging.

Pickart L, Margolina A. Regenerative and protective actions of the GHK-Cu peptide in the light of the new gene data. International Journal of Molecular Sciences. 2018;19(7):1987.

MOTS-c and bone

Ming W, Lu G, Xin S, et al. Mitochondria related peptide MOTS-c suppresses ovariectomy-induced bone loss via AMPK activation. Biochemical and Biophysical Research Communications. 2016;476(4):412-419. Ovariectomized mice, 5 mg/kg daily for twelve weeks, bone loss assessed by micro-CT.

Retatrutide

Jastreboff AM, Kaplan LM, Frias JP, et al. Triple-hormone-receptor agonist retatrutide for obesity: a phase 2 trial. New England Journal of Medicine. 2023;389(6):514-526.

Rosenstock J, Frias J, Jastreboff AM, et al. Retatrutide in people with type 2 diabetes: TRANSCEND-T2D-1. The Lancet. 2026. 537 participants, 40 weeks.

Phase 3 TRIUMPH results, including TRIUMPH-1 (2,339 participants, 80 weeks) and TRIUMPH-3 and TRIUMPH-4, come from Eli Lilly press releases and conference presentations rather than peer-reviewed publications as of this writing. Treat the specific figures accordingly until the full papers appear.

The FDA compounding decision

U.S. Food and Drug Administration. Pharmacy Compounding Advisory Committee meeting, July 23-24, 2026. Meeting materials, briefing documents, and vote records are available on the FDA advisory committee calendar.

The 2023 Category 2 reclassification and the April 2026 removals are documented in FDA’s 503A bulk drug substances lists and accompanying Federal Register notices.

Approved drugs later withdrawn

Graham DJ, Campen D, Hui R, et al. Risk of acute myocardial infarction and sudden cardiac death in patients treated with COX-2 selective and non-selective NSAIDs. The Lancet. 2005;365(9458):475-481. Source of the widely cited Vioxx excess-event estimates.

Connolly HM, Crary JL, McGoon MD, et al. Valvular heart disease associated with fenfluramine-phentermine. New England Journal of Medicine. 1997;337(9):581-588.

Semax, Selank, and Epitalon

The bulk of the clinical literature on these compounds comes from the Institute of Molecular Genetics of the Russian Academy of Sciences and from Khavinson’s group at the St. Petersburg Institute of Bioregulation and Gerontology, published largely in Russian-language journals. Semax and Selank hold Russian regulatory approval. Independent Western replication is limited, which is the honest caveat on all three.

PT-141

Kingsberg SA, Clayton AH, Portman D, et al. Bremelanotide for the treatment of hypoactive sexual desire disorder: two randomized phase 3 trials. Obstetrics and Gynecology. 2019;134(5):899-908.

A note on what is not cited here

Claims about SLU-PP-332, Dihexa, and the injectable NAD+ market rest on the absence of human trials rather than on published findings, which is precisely the point being made. Where I’ve described my own experience, that is one person’s account and carries no evidentiary weight beyond that.