Every peptide, explained.
Most peptides work by restoring a signal your body already uses. Each entry covers what the peptide is, the signal it works through, and what the research actually shows, with every claim referenced to the primary literature. How entries are graded
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Sermorelin
A small peptide that copies the first 29 amino acids of growth-hormone-releasing hormone, the signal your brain sends to tell the pituitary to make growth hormone.
Human-testedSemaglutide
A longer-lasting version of GLP-1, a hormone your gut releases when you eat.
EstablishedTirzepatide
A weekly peptide that acts like two gut hormones at once, GLP-1 and GIP.
EstablishedPT-141 (Bremelanotide)
A seven-amino-acid peptide that works on the brain circuits involved in sexual desire.
EstablishedGlutathione
A three-amino-acid peptide your cells make themselves, and the body's main antioxidant.
Human-testedNAD+
A coenzyme (not a peptide) that every cell uses to turn food into energy, made in the body from vitamin B3.
Human-testedOxytocin
A nine-amino-acid hormone your brain makes, tied to labor, bonding, and social connection.
EstablishedThe Atlas is growing. New entries are added in reviewed batches, ordered by what people ask about most.