Thymulin

A zinc-dependent thymus hormone. People have been measured for it for decades, but giving it as a treatment has barely been tested in humans.

Also known as: Facteur thymique sérique, FTS, Zinc-thymulin, FTS-Zn
Area: Immune
Status: Not approved as a medicine in the UK or US; experimental

Articles on Thymulin

ImmunePreclinical

Thymulin: a real thymus hormone with almost no treatment trials in people

Thymulin has been measured in human blood since the 1970s and tracks zinc status and thymus function. Giving it as a treatment has barely been studied in humans.

HPR Editorial · 12 Sept 2026 · 7 min read