Zinc Thymulin

Skin & hair Research only Human trials

Thymulin, the thymus hormone, complexed with the zinc it needs to be active at all. Applied to the scalp rather than injected, it is studied for hair growth — a use unrelated to thymulin's immune role.

Evidence at a glance

Evidence: Human trials — Studied in people
Status: Research compound only
Dosing: No human study has set a dose

One small topical study underpins the hair claim. Thymulin itself is well characterised as an immune hormone, but that body of work says nothing about applying it to a scalp.

What studies report

Significantly increased hair growth over 6 months in a topical study
No systemic or local side effects reported in that study
Reported to stimulate pigment production in greying hair

How it works

Thymulin requires zinc for biological activity. The hair effect is attributed to stimulation of the follicle growth phase, with reported effects on melanogenesis in greying hair.

Binds a receptor on the cell surface and signals inward

Where it acts

Acts in the skin, throughout the body

The library groups this compound under Skin & hair. The diagram shows that target, not every tissue it reaches.

Illustrated

A detailed longitudinal hair follicle cutaway with bulb, dermal papilla and surrounding skin.

AI-generated subject illustration; not a depiction of the compound or evidence of its effects.

Why people take it

Hair loss and thinningHair pigmentation

Reasons people seek it out — not a list of proven effects.

In practice Unapproved use

Applied nightly to the scalp
Often combined with minoxidil rather than replacing it

Reported real-world use, not evidence and not a recommendation.

Status: Research compound, available compounded. Not approved for hair loss.

Route: Topical scalp foam
Available as: Topical foam

Search PubMed for Zinc Thymulin → We link a live search rather than a fixed citation list, so it stays current and nothing here is a reference we have not checked.

Educational information only. Nothing here is medical advice, a dosing protocol, or a recommendation to use any compound. Most entries describe substances not approved for human use. Talk to a licensed clinician before acting on anything you read here. How to read these entries.