Very large DIY-biology and biohacking subreddit where peptides and HRT are frequent topics (it has a pinned 'start here' thread for peptides).
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Community
67 places where people discuss peptides, compare notes and post their own lab tests. Outside sites we don't run or vouch for: experiences aren't evidence, and some allow vendor promotion, which is marked on each card.
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Reddit 39
Large international biohacking subreddit run by the 'International Biohacking Community' (Josh Universe); peptides, nootropics and longevity are common topics.
Vendor promotion: run by a biohacking personality whose sidebar links his own website and 'Protocols & Products'
Very large support community for users of brand-name Zepbound (tirzepatide) for weight loss.
Largest retatrutide community following the investigational triple agonist's trials and user reports; bans naming sellers or group buys.
Large community for users of Mounjaro (tirzepatide) sharing experiences and side-effect management.
Largest compounded-tirzepatide community; prescription-only, with research-peptide and reconstitution talk prohibited.
Large biohacking/peptide subreddit focused on GLP-1s, GH peptides, recovery compounds and bloodwork; bans sourcing talk in posts.
Vendor promotion: affiliated with the BodyHackGuide.com website; sidebar links a 'Verified List'
Large subreddit about cognitive-enhancing substances; nootropic peptides like Semax and Selank come up alongside other compounds.
Note: vendor experience threads common
Discussion of FDA-approved semaglutide (Wegovy/Ozempic/Rybelsus); compounded formulations are not allowed.
Biohacking subreddit covering nootropics, PEDs, SARMs and peptides.
Vendor-run: run by the owner of biohackingu.com, whose description advertises coaching and sourcing via that site
Peptide subreddit with large cheat-sheet posts on dosing, reconstitution and bloodwork for GLP-1s, GH secretagogues and other compounds.
Vendor promotion: mod-curated vendor list ('Trusted Peptide Sources' pinned post); affiliated with ntnperformance.com
Long-running general subreddit (since 2013) for discussion of research peptides, reconstitution, dosing questions and user experiences.
Note: vendor discussion common; affiliated users must disclose (rule 2); marked 18+/adult content by Reddit
Community for people using or considering prescription compounded tirzepatide.
Vendor-run: sidebar states it was created by telehealth provider Emerge, and one of its members remains a moderator
Women-focused retatrutide discussion community; no mention of sources.
General research-peptide discussion subreddit; points users to the separately run peptidesource.net forum for topics not allowed on Reddit.
Vendor promotion: companion forum peptidesource.net hosts vendor-sponsor subforums
Education-oriented peptide subreddit with a wiki-style peptide dictionary and reconstitution calculator; prohibits vendor names, pricing and sourcing.
General tirzepatide experiences community; bans overseas 'research' peptide sourcing discussion.
Community discussing low-dose GLP-1 use for inflammatory and other non-obesity indications, framed around harm reduction.
General GLP-1 agonist discussion covering Wegovy, Ozempic, Mounjaro, Zepbound and others.
BPC-157 research and support subreddit for injury/recovery experiences and study discussion; sourcing is a permanent-ban offence.
Community discussing Melanotan II for tanning, including dosing and side-effect reports.
Moderated subreddit on basic aging-biology research and clinical translation of anti-aging interventions.
Discussion of compounded semaglutide experiences, dosing and side effects.
Community on NAD+ precursors (NR, NMN, niacin) and NAD+ replenishment research.
Newer retatrutide discussion community for sharing experiences; bans buying, selling or sourcing talk.
Discussion of Cerebrolysin and related neurological drugs used in Eastern Europe.
Note: vendors may participate with identifying flair
Beginner-oriented peptide discussion subreddit created in 2026.
Vendor-run: moderators promote the community's own vendor discount code in pinned post and sidebar
General research-peptide chat subreddit sharing studies and user experiences.
Vendor promotion: heavy sourcing/vendor promotion: pinned 'Top Peptide Vendors' ranking megathreads
Community where users report alleged peptide vendor and testing-lab scams with supporting evidence.
Note: user-submitted allegations, not independently verified
Community on GHK-Cu protocols, skin, hair and recovery experiences.
Vendor promotion: pinned 'GHK-Cu Vendor Guide' post
Discussion of cagrilintide, an investigational amylin analogue, often in combination with other GLP-1s.
Subreddit about tesamorelin experiences, often combined with other GH secretagogues.
Discussion of methylene blue as a supplement, including its serious interaction warnings.
Sermorelin discussion community; bans vendor names and DM-for-source requests.
Subreddit about the anxiolytic peptide Selank.
Subreddit about the nootropic peptide Semax.
Small subreddit about peptides discussed for cognitive effects, such as Semax, Selank, Dihexa and Pinealon.
Small beginner subreddit for basic peptide questions such as reconstitution math, terminology and tracking.
Vendor promotion: sidebar links to an app run by the moderators
Small community for PT-141 (bremelanotide) experiences and questions.
Forums 8
Independent XenForo forum for GLP-1 agonist users; this section covers non-GLP-1 peptides, blends and stacks.
Vendor promotion: hosts vendor-specific subforums (e.g. named Chinese peptide manufacturers) and a 'Research Chemicals & Sourcing' section
Independent forum covering all GLP-1 agonists (semaglutide, tirzepatide, retatrutide, cagrilintide) however they are obtained.
Vendor promotion: openly allows sourcing and price discussion; vendors have their own subforums
Long-running MESO-Rx (ThinkSteroids) subforum discussing hGH, IGF-1, GHRPs, CJC-1295, TB-500, Melanotan II and newer peptides.
Note: performance-enhancement (steroid) forum; banner ads for underground suppliers
Supplement and bodybuilding forum subsection for peptide and research-compound discussion.
Vendor promotion: site carries sponsor/company promotion sections; a research-chemical company sponsor is discussed in threads
Men's-health/TRT forum section on peptides such as GHRH analogues and sermorelin.
Vendor promotion: site links an affiliated discount lab-testing service
Peptide-focused discussion board with sections for general peptide discussion, vendor reviews, and mixing/storage questions.
Note: parent site sells pens, publishes a vendor directory and coupon codes; vendor-review section active
Small independent peptide forum with per-compound subforums and a publicly shared lab-tests section; companion to r/Peptidesource.
Vendor promotion: has vendor 'SPONSORS' subforums
Longevity-advocacy forum's subforum on NAD+ and its precursors within the Supplements section.
Vendor promotion: site sponsor banner (CrackAging.com)
Independent testing 5
Crowdsourced peptide testing service that publishes identity/purity/quantity results and vendor ratings, with free community test slots.
Note: commercial company that also sells testing services; some users have raised conflict-of-interest concerns
Public search of test reports from Janoshik, a Czech lab widely used to test research peptides; reports are only public if the submitter chooses.
Note: many public reports are submitted by vendors (selection bias); lab disclaims endorsement
Site that mirrors and audits Janoshik's public test database and publishes vendor audits.
Note: commercial review site; ownership/funding not disclosed on the page loaded
Directory of peptide testing labs plus a searchable archive of public certificates of analysis.
Vendor promotion: also ranks vendors and runs sponsored vendor placements with referral codes
Toronto-based analytical lab offering independent peptide identity/purity testing with report verification; also runs r/Testides.
Note: commercial testing lab (paid service)
Reference 12
NIH/NLM database of biomedical literature citations, useful for finding studies on specific peptides.
Open life-sciences literature database with many free full-text articles.
US registry of clinical trials, including trials of investigational peptides such as retatrutide and cagrilintide.
NLM repository of official FDA drug labels for approved products (e.g. semaglutide, tirzepatide, tesamorelin).
NLM consumer drug information for approved medications and supplements.
NIH database on drug- and supplement-induced liver injury.
Independent summaries of research on supplements and non-pharmaceutical interventions.
FDA page listing bulk substances (including several peptides such as BPC-157) it considers to pose significant safety risks in compounding.
FDA overview of the 503A bulk drug substance categories that determine which substances pharmacies may compound.
FDA statement on compounded and unapproved semaglutide/tirzepatide products.
World Anti-Doping Agency list of substances banned in sport, which includes many peptide hormones and growth factors.
Encyclopedia overview of peptides used as medicines, with links to individual compounds.
Chat groups 3
Main Discord server of the International Biohacking Community, covering biohacking topics including peptides.
Vendor promotion: run by the r/Biohacking owner's brand
Telegram channel of the International Biohacking Community covering longevity, peptides and nootropics.
Vendor promotion: run by the r/Biohacking owner's brand
Discord server for the r/NTNPerformance peptide community.
Vendor promotion: parent subreddit pins a mod-curated vendor list