Peptide Library
Neutral, sourced summaries of widely discussed peptides. Each entry lists its regulatory status and the level of human evidence — not promises of results.
Educational information only. Not medical advice. Always consult a licensed healthcare provider before making any health decision.
How to read this library
Every entry carries three labels. Together they answer the question marketing never does: how much is actually known about this compound?
Regulatory status
FDA-approved drugs sit at the top; compounds available only through compounding pharmacies vary by current eligibility; 'research-stage' means no approval pathway at all. The status tells you which rules — and whose oversight — apply.
Evidence level
Three honest tiers: human clinical trials, limited human data, or mostly animal and lab studies. A compound's tier is about what's been published — not what a forum says worked for someone.
The mismatch to watch
Online popularity and evidence level have almost no relationship. Several of the most-discussed compounds in this library sit in the lowest evidence tier — that mismatch is the single most useful thing the library shows.
The categories at a glance
An honest sentence on each — tap one to filter the library.
Showing 48 of 48 peptides
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How many peptides are there?
Thousands occur naturally in the human body, and hundreds circulate in research and commerce. This library covers the compounds people actually encounter — approved drugs, compounded prescriptions and widely marketed research compounds — with the regulatory status and evidence level stated for each.
What do the evidence levels in this library mean?
They grade the human evidence behind each compound: approved drugs with large trials sit at the top; compounds with only animal or cell studies sit at the bottom. A compound's popularity online has no relationship to its tier — that mismatch is the main thing the library exists to show.
What is the strongest peptide?
'Strongest' isn't a scientific category — compounds do different jobs with different evidence. The better question is which peptide has demonstrated evidence for a specific, diagnosed need, and that answer belongs in a conversation with a licensed provider.
Why do some entries say 'not eligible for compounding'?
FDA periodically evaluates which bulk substances licensed pharmacies may compound, and several popular peptides have been restricted or excluded. That status changes over time — a licensed pharmacy can tell you where a compound stands today.
What are the best peptides?
'Best' only means something attached to a goal and an evidence tier. For medically supervised weight loss, the FDA-approved GLP-1 class is the one family with large-trial support; for every other goal in this library, the honest answer is that no compound has earned the word 'best' in human trials. Ranked lists that ignore that are marketing.
What are research peptides?
Compounds sold 'for research use only' outside pharmacy channels. The label is a legal posture, not a quality tier — it means no required purity testing, no verified dose, and no oversight. Analyses of such products have repeatedly found mislabeled contents.
Do peptides require a prescription?
It follows the channel: peptide drugs and compounded peptides require a prescription from a licensed provider; cosmetic and supplement peptides don't. Anything injectable offered without a prescription is operating outside the lawful channels entirely.
Do peptides have side effects?
Approved peptide drugs have documented ones — measured in trials, listed on the label, managed by a prescriber. Unapproved peptides have largely unmeasured ones, which is worse, not better: 'no reported side effects' usually means nobody was required to look.