Longevity & Mitochondrial

Thymulin

Also known as Thymulin · Zinc-thymulin · Facteur Thymique Serique · FTS

PreliminarySubcutaneousIntramuscularNot FDA-approved; remains a research compound without regulatory approval for direct administration

Thymulin is a zinc-dependent nonapeptide produced by thymic epithelial cells that requires zinc as a cofactor for biological activity. It has been studied for its role in T-cell differentiation, cytokine production, and immune function, and its serum levels fall with age as the thymus involutes. The clinical evidence base is very thin, resting largely on older preclinical work and limited early human data that have not been replicated in modern controlled human trials.

Studied / used for

Studied for T-cell maturation and immune modulation
Researched in the context of age-related immune decline (immunosenescence)
Studied for cytokine balance and NK cell activity
Researched for neuroprotective and analgesic properties in preclinical models

Commonly reported side effects

Injection site reactions
Limited modern human safety data available
Side effect profile not well characterized in current research

Preliminary. Mostly early or animal studies. This reflects the strength of the research base, not effectiveness or a recommendation.

Not medical advice.

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