71
Peptide profiles
75
Compounds compared
104
Verified discount codes
100%
Independent research
Prof. Peptide provides peptide research for educational purposes only. Nothing on this site constitutes medical advice or endorses human use of research peptides.
Latest News
View all newsOctober 17, 2026
FDA Again Says Retatrutide Is a Drug; the Seventh Circuit Asks Whether Lilly Can Appeal at All
On October 2, 2026 the FDA issued its decision on remand in Lilly v. Kennedy and again concluded that retatrutide, built on a 39-alpha-amino-acid chain, is neither a protein nor an analogous product, so it is not a biological product. Meanwhile the Seventh Circuit, after the September 24 argument, ordered briefing on whether Lilly may appeal a remand order at all; both sides filed on October 8. What the FDA decided, what each side told the court, and what remains open.
Read more →October 17, 2026
TRIUMPH-1 Is Now in the NEJM: Retatrutide's 80-Week Obesity Results
The phase 3 TRIUMPH-1 trial of retatrutide is now peer-reviewed. The New England Journal of Medicine paper (September 29, 2026) reports 80-week outcomes in 2,339 adults with obesity: mean weight change of -17.6%, -23.7% and -25.0% at 4, 9 and 12 mg versus -3.9% with placebo, plus knee osteoarthritis pain and sleep apnea results. The figures as published, what the abstract says about adverse events, and how they differ from May's company release.
Read more →October 17, 2026
TRIUMPH-2: Retatrutide in Type 2 Diabetes and Obesity, With the Adverse Events
Lilly's phase 3 TRIUMPH-2 trial of retatrutide in 1,152 adults with type 2 diabetes and obesity was presented at EASD on September 29, 2026 and published in The Lancet. Weight change at 80 weeks was -11.9%, -16.8% and -18.8% versus -5.1% on the journal's treatment-regimen estimand, and -12.7%, -19.1% and -20.8% on Lilly's efficacy estimand. With them: diarrhoea, nausea, hypotension, dysesthesia and discontinuation rates.
Read more →Everything a researcher needs
From peptide mechanisms to reconstitution math — Prof. Peptide covers it all, clearly and credibly.
Peptide Library
Comprehensive profiles on 71 research peptides — mechanisms, half-lives, stacking protocols, and more.
Browse library →Bioregulator Guide
A research guide to the Khavinson short-peptide bioregulators — the gene-regulation hypothesis, synthetic analogs vs. organ extracts, and the individual compounds.
Read the guide →Comparisons
Side-by-side breakdowns of popular peptides and supplements — mechanisms, evidence, dosing, and how to choose between them.
Compare compounds →Featured Vendors
Our vetted alphabetical list of research peptide suppliers — with third-party testing, published COAs, and the quality criteria we use to include them.
See vetted vendors →Prices
Compare research-peptide prices across 104 vendors — normalized to $/mg by vial size, post-code, and sorted lowest-first.
Compare prices →Coupon Codes
Verified discount codes for research-grade suppliers. Updated regularly.
See codes →Peptide Reconstitution & Dosage Calculator
Accurately reconstitute and dose any peptide with our step-by-step research calculator.
Open calculator →Get the App
The all-in-one peptide tracker for iPhone — log doses, see estimated levels, run protocols, and search 70+ peptides by name or brand.
Download →News
The latest peptide research news, regulatory updates, and developments.
View news →Built for researchers
Most peptide sites exist to sell products. Prof. Peptide exists to educate. We're independent, ad-light, and committed to presenting research accurately — including limitations and unknowns.
- ✓Content is editorially independent and research-driven
- ✓Every peptide profile cites primary research literature
- ✓Calculator math is transparent and peer-reviewable
- ✓Discount codes are manually verified before publishing
Now on iOS
The all-in-one peptide tracker
Log doses, see estimated levels, calculate reconstitution, and search 70+ peptides by name or brand — all in one private iOS app.
Get the AppDon't overpay for peptides.
Let us do the research and find the best deals for you.