The research peptide market runs on claims. We run on documents — trial data, certificates of analysis, FDA import records, payment-network rules. We cover the science, the supply chain, and the business underneath it, and we cite everything.
The phase 2 numbers everyone quotes, what the phase 3 program still has to prove, and where the hype outruns the data.
read the evidence →Purity is one number. Identity, net content, endotoxin, and microbial screening are the ones most certificates quietly skip.
learn the panel →Peptide vendors live outside the mainstream payment rails. What that means for you — and what a crypto-only checkout is telling you.
follow the money →The core knowledge every reader needs before spending a dollar — written to be read once and actually retained.
Vendor vetting, COA checks, and the red flags that end the conversation.
What published protocols actually used — cadence, titration, cycles.
Bacteriostatic water math, storage, and getting every measurement right.
Realistic expectations, week by week — from the data, not the marketing.
What to watch for, what the trials reported, and when to stop.
Nearly every vial on the US market starts as bulk API from a small set of overseas synthesizers. FDA's Import Alert 66-80 now detains GLP-1 shipments by default — unless the maker is one of 19 green-listed firms worldwide. Here is how to check a supplier yourself.
Shortage rules built the compounded GLP-1 market and shortage rules are unwinding it. Where telehealth, 503A pharmacies, and research-use vendors actually stand right now.
Roughly a quarter to a third of the weight lost on GLP-1 agonists can be lean mass. The trial data, the resistance-training counterweight, and the protein math.
USP <71> sterility, USP <85> endotoxin, and PCR microbial screens are three different tests. Most vendors run one of them at most — and the word "tested" hides the difference.
The most-searched healing peptide on the market rests almost entirely on animal data. What the studies show, what they don't, and why WADA bans it anyway.
We don't sell anything. When coverage points somewhere, it points to vendors whose paperwork we can actually verify — and the criteria are public.
We graded vendors on one axis only: the quality documents they actually publish. Named labs, real accession numbers, measured fill — or nothing.
vendor spotlightA US-fulfilled research supplier publishing five-measure certificates — identity, purity, net content, endotoxin, microbial screen — with the lab named and the measured fill printed. GLP compounds list under catalog codes.
reader skillFive minutes with any certificate tells you whether a vendor is showing you data or showing you a prop. The checklist, step by step.
disclosure: coverage on this site may earn referral fees from vendors we link to, including the next lab. rankings and grades follow the published criteria in our editorial policy — never referral terms.
Every compound we cover — what it is, what the evidence grade looks like, and where the research stands.
Triple agonist [GLP-1 + GIP + glucagon]. The strongest phase 2 weight-loss data ever published — still unapproved, still in phase 3.
weight lossDual GLP-1/GIP agonist. FDA-approved as Mounjaro and Zepbound — the benchmark the rest of the class is measured against.
healingGastric pentadecapeptide studied for tendon, ligament, and gut repair — in animals. Human trial data remains close to zero.
longevityCoenzyme central to cellular energy metabolism. Levels decline with age; injectable repletion is popular and under-studied.
skinCopper tripeptide with genuine published data on skin remodeling and wound healing — one of the better-evidenced cosmetic peptides.
growth hormoneGHRH analog, FDA-approved for HIV-associated lipodystrophy — meaning it has real human efficacy data most GH peptides lack.
Inside Your Peptides is an independent editorial site covering the research peptide market. We grade compounds by the quality of their published evidence, audit vendors by the quality documents they publish, and report on the infrastructure the market runs on — synthesis and import, payment processing, FDA policy, and lab testing. We sell nothing. When we recommend a source, we link out and disclose the relationship. Every article carries its references.