What are peptides?
Peptides are short chains of amino acids — the same basic building blocks used to make proteins. In the body, many peptides act as signalling molecules.
The word peptide does not automatically mean something is approved, effective or safe. Those questions depend on the specific compound, how it was studied and the quality of the evidence.
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What are you interested in?
Start with the question or outcome you care about. Each route opens a curated evidence topic, not a recommendation list.
New to peptides?
Start simple. Go deeper only when you need to.
What you will find on a compound page
- A plain-English answer first
- Human evidence separated from animal and laboratory evidence
- Important negative or uncertain findings
- Safety and regulatory context
- Links to the underlying studies and sources
Vials, pens, BAC water & brands →Commonly researched compounds
View all →Retatrutide
Metabolic and weight-management research
BPC-157
Tissue and injury research
GHK-Cu
Skin, collagen and tissue research
Evidence library
Explore studies →How WhichPeps works
Methodology →Start with the plain answer
See what the evidence means before the technical detail.
Separate evidence types
Human, animal, laboratory, regulatory and combination evidence stay distinct.
Trace the conclusion
Open the studies, limitations, review dates and source records behind the page.
Latest evidence changes
Change history →Orforglipron — U.S. approval updated
Foundayo approval is reflected with the relevant indication and date.
Thymosin alpha-1 — sepsis evidence updated
The large TESTS trial found no clear 28-day mortality benefit in adults with sepsis.
Dihexa — retraction flagged
A central mechanistic paper was retracted and remains visibly flagged in the record.
Evidence before hype
Study count is not a score. Mechanism is not the same as clinical benefit. Negative results, uncertainty and research-integrity issues stay visible.
Structured evidence sits underneath the public pages.
Canonical entities, aliases, study design, populations, outcomes, route/formulation, regulatory status, provenance, review dates and change history are tracked as structured fields.