inside your peptides.

the research deskindependent · sourced · free·updated aug 2026

Learn the compound.
Read the certificate.

We grade the research peptide market on published human evidence — and link out to every source. No store, no doses, no affiliate lists.

for research and educational purposes only · not medical advice

Read the COA guide → Browse 45 compounds

new report Forty skin interventions, rankedSunscreen outranks the peptide. Zero injectable peptides have a skin trial. → audit live Vendors graded on paperFive measures, one public rubric, honest grades. → supply chain Import Alert 66-80, decodedGLP-1 imports detain by default. Check a supplier yourself in four steps. →

evidence boardall compounds →

phase 2Retatrutidestrongest published numbers · unapproved~24%48 wks · NEJM 2023 approvedTirzepatideSURMOUNT-1 · phase 3~20.9%72 wks animal onlyBPC-157no published human RCTs0human trials the trade-offLean mass on GLP-1sSTEP 1 DXA substudy~39%of weight lost zeroInjectable peptides for skinGHK-Cu · BPC-157 · TB-500 · epitalon · MOTS-c0human RCTs w/ skin endpoint

45

compounds graded

17

reports live

5

COA measures scored

19

green-listed GLP firms

start with the goal

Not sure which compound. Start with what you want.

Each page ranks the whole field for one goal — habits, procedures and approved drugs on the same ladder as the peptides. On three of the four, the top of the ladder is not a peptide.

Fat losstwo hold an approval · the rest grade D and E Muscle growththe strongest thing on the list is free Skin and ageing40 interventions ranked · sunscreen outranks the peptide Injury recoveryrehab is the evidence · and why no trial ever ran

the sourcing desk · graded, not sponsored

The 2026 COA audit

We grade vendors on one thing: the documents they publish. Identity, purity, net content, endotoxin, and microbial screening — five measures, one public rubric, applied the same way to everyone. The highest grade on the board right now is the next lab, at A− — five measures on the certificate and the measured fill printed on the vial, held back from an A because coverage is tiered rather than universal. Sterility is not tested by anyone on this board, and we say so on every line.

Read the full audit → How we grade

top of the board

the next lab

A−

measures on the certificate

5 / 5

measured fill printed

48.22 mg

sterility

not tested

Disclosure: Inside Your Peptides is published by the owners of the next lab. Its link is the only paid link on this site — every other vendor we grade is cited without payment, commission, or coupon, and their links carry rel="nofollow". Grades follow the published criteria in our editorial policy — never commercial terms.

latest

New from the desk.

See all reports →

Fullness is not muscle

Three compounds, three different stories, and one measurement problem that explains all of them. The scan moves. The muscle does not.

Peptides in 2026, graded

Seventeen compounds, one ladder, no generosity. Two hold an FDA approval for what they are sold to do, seven grade D, and the thing everyone called a legalisation in April 2026 was the opposite.

GHK-Cu, route by route

Three randomised trials in forty years, two of them negative, and not one measurement of elastin in a living human. Topical GHK-Cu grades D. Sunscreen grades A.

Forty skin interventions, ranked

Two retractions, one negative copper-peptide trial nobody cites, and not one injectable peptide with a randomised human skin endpoint. The honest stack, in order.

What Inside Your Peptides is: an independent editorial desk covering the research peptide market. We publish evidence grades for individual compounds, audits of the quality documents vendors publish, and reporting on the supply chain, payment rails, and regulation underneath the market. We do not sell compounds and we operate no checkout. When we recommend a place to buy, we say so plainly, we link out, and we disclose that we may earn a referral fee — the grade is set by the published rubric, never by the referral terms.