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.
Immune support · 4
LL-37 is a natural peptide the body makes as part of its defence against infection. It is studied for its antimicrobial and immune effects, mostly in the laboratory. It is not a licensed medicine in the UK.
Thymogen is a very short peptide related to the thymus, developed in Russia and marketed to support the immune system. It is one of the peptide bioregulators, with most research from a single group. It is not a licensed medicine in the UK.
Thymalin is a peptide preparation from the thymus gland, developed in Russia and marketed to support the immune system. It belongs to the family of peptide bioregulators, where most of the research comes from one group. It is not a licensed medicine in the UK.
Thymosin alpha-1 is a synthetic copy of a natural peptide made by the thymus, the gland that helps train the immune system. It is a licensed medicine in a number of countries for certain infections and as a support in cancer care, but 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.