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The peptide directory · 2026 Edition
A clear view of every peptide worth knowing.
68 peptides and related compounds — indexed across mechanism, human trial evidence, regulatory status and public interest. One place to figure out what's worth attention.
Every claim carries a sourceCalculator math runs in your browserNo account required
414,631
people a month read about these compounds
English Wikipedia article views, Wikimedia pageviews API. Each compound is a monthly average over its own window of complete months — shown on its page.
3,186
registered human studies counted
ClinicalTrials.gov, verified against the intervention each trial names
121,437
papers published in ten years
PubMed, phrase-matched in title and abstract
Collected 2026-08-02. Readership covers the 59 of 68 compounds that have an English Wikipedia article, and measures attention — not sales, not demand, and not whether anything works.
Market snapshot
What the record says.
Registered human studies and regulatory status for every compound we track, pulled from ClinicalTrials.gov and Drugs@FDA.
What the public record holds
Compounds checked
68 of 68
Looked up against ClinicalTrials.gov and Drugs@FDA on Aug 2, 2026
With an approved product
19
49 have no FDA-approved product containing them
No human study at all
25
Not one registered trial on ClinicalTrials.gov names them as an intervention. See which · Why clinic prices differ
Registered studies counted
3,186
Across every tracked compound, verified against the intervention named in each trial
| # | Watchlist | Compound | Category | FDA statusapproved product exists | Human studiesregistered on ClinicalTrials.gov | Evidencehow much is known | ReadershipWikipedia readers / month |
|---|---|---|---|---|---|---|---|
| 1 | SemaglutideSEMA | Metabolic & weight loss | ApprovedWEGOVY | 589 studiesto phase 4 | A · Strong — An approved product exists | 54,466readers / month | |
| 2 | RetatrutideRETA | Metabolic & weight loss | Research onlyno FDA approval | 20 studiesto phase 3 | B · Moderate — Reached phase 3 or 4, not approved | 49,387readers / month | |
| 3 | TirzepatideTIRZ | Metabolic & weight loss | ApprovedZEPBOUND | 222 studiesto phase 4 | A · Strong — An approved product exists | 38,322readers / month | |
| 4 | BPC-157BPC | Tissue repair & growth | Research onlyno FDA approval | 2 studiesto phase 2 | C · Limited — Phase 1 or 2 only | 31,331readers / month | |
| 5 | OxytocinOXYT | Sexual & hormonal | ApprovedOXYTOCIN | 648 studiesto phase 4 | A · Strong — An approved product exists | 25,916readers / month | |
| 6 | GHK-CuGHKCUNote: 3 loose registry matches, 1 confirmed | Skin & hair | Research onlyno FDA approval | 1 studyto phase 2 | C · Limited — Phase 1 or 2 only | 20,088readers / month | |
| 7 | NAD+NADNote: 260 loose registry matches, 71 confirmed | Longevity & cellular | Research onlyno FDA approval | 71 studiesto phase 4 | B · Moderate — Reached phase 3 or 4, not approved | 19,297readers / month | |
| 8 | GlutathioneGSHNote: 267 loose registry matches, 72 confirmed | Longevity & cellular | Research onlyno FDA approval | 72 studiesto phase 4 | B · Moderate — Reached phase 3 or 4, not approved | 14,776readers / month |
Latest reading
The research, read for you.
Sourced explainers on compounds, training, and protocol logistics. Every article is dated and review-stamped.
GLP-1 and muscle
What controlled trials actually measured about lean mass on GLP-1s
The large trials reported total body weight. Body composition came from small imaging substudies — and those instruments have limits of their own.Peptide basics
Why one unapproved compound has 39 trials
A trial count can be inflated by how a compound is developed rather than how much is known about it. This is the clearest example on the site.CagrilintideSemaglutidePramlintidePeptide basicsFour things in this peptide directory are not peptides
Peptide has become a marketing category rather than a chemical one, and four compounds on this site prove it.MK-677EnclomipheneOrforglipron+1Free tools
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Reconstitution calculator
Calculate the relationship among a vial amount, liquid volume, and amount you enter.
Enter every value to see the calculation.
Unit safety: a U-100 mark is a volume scale (100 units = 1 mL), not a medication amount. FDA has reported medication errors when mg, mL, and syringe units were confused. Verify the intended amount, concentration, and exact device with the dispensing pharmacy or licensed clinician. Read the FDA notice.
Calculation only. Prominent display values are rounded to at most 2 decimals for U-100 units and cost, and 3 decimals for mL; calculation-value lines retain up to 8 decimals. Math uses unrounded values throughout. PepRack does not recommend a dose, schedule, injection method, or treatment.
01ReconstitutionEntered vial + liquid + amount → mL and U-100 scale↗02ReverseEntered vial + amount + U-100 mark → liquid volume↗03Syringe unitsEntered concentration + amount → mL and U-100 scale↗04Cost per doseSee per-dose, weekly, and monthly cost↗05Half-lifeVisualize estimated decay from your schedule↗
The archive
Everything we have published.
Browse the full collection by topic, or start with the most recently reviewed work.
Peptide basics
Some compounds here have no trials, no papers and almost no readers
The site tracks four independent things for each compound. A handful score close to zero on all of them, and are sold anyway.AOD-9604AdipotideFollistatin 344+1Peptide basicsThe placebo group was not doing nothing
Half of every trial is the comparison group, and what that group received decides what the headline number actually means.SemaglutideTirzepatidePeptide basicsThe famous gut peptide has 162 participants. The obscure one has 1,211
Two peptides studied for the gut lining. One of them you have heard of, and it is not the one with the evidence.BPC-157LarazotidePeptide basicsThe way around the swallowing problem was to stop using a peptide
Peptides are hard to swallow because of what they are. One solution was to build something that hits the same target and is not one.OrforglipronSemaglutideTirzepatideBuying and sourcingResearch use only is a sentence about the seller, not the product
It is the most common phrase in this market and one of the most widely misread. It describes intent, not quality.BPC-157TB-500EpithalonPeptide basicsFour unapproved GLP-1 compounds have already enrolled 65,000 people
Not approved does not mean not studied. Four compounds in this class have larger evidence bases than most approved peptides on this site.RetatrutideCagrilintideSurvodutide+1100 articles published
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