UK peptide reference
Peptides A–Z
A plain English reference to 116 compounds across 8 categories. For each one we give the UK legal status and, where there is one, the licensed alternative. We list no sellers and link to none.
Sexual wellness · 5
Kisspeptin-10 is a natural signalling peptide that sits at the top of the chain controlling the body's sex hormones. It is an active area of fertility research. It is not a licensed medicine in the UK, and is sold online for research use.
Melanotan 1 is a peptide that darkens the skin by boosting its natural pigment. In a controlled form, afamelanotide, it is a licensed medicine for a rare light sensitivity condition. The Melanotan 1 sold online for tanning is unlicensed and unregulated.
Melanotan II is a synthetic peptide marketed to darken the skin, and sometimes for appetite or erections. It has never been approved as a medicine, and the MHRA has warned against buying or using it. The human evidence is very limited.
Oxytocin is a natural hormone involved in childbirth and social bonding. As a medicine it is licensed for use in childbirth, given in hospital. The nasal sprays sold online for bonding, anxiety or intimacy are unlicensed, and the evidence for those uses is weak.
PT-141, also called bremelanotide, is a peptide that acts on the brain to affect sexual desire rather than on blood flow. It is a licensed medicine in some countries for a specific type of low desire in women. It has no UK marketing authorisation.
Factual reference only, not medical advice. “Research use only” labelling does not make an unlicensed product legal to sell as a medicine (MHRA). Report side effects through the MHRA Yellow Card scheme.