Healing Category
Thymulin
THE THYMUS REJUVENATOR
Facteur Thymique Sérum (FTS), Thymic Serum Factor
Thymulin is a natural hormone produced by your thymus gland that declines with age. It's essential for training and maturing your T-cells, the soldiers of your immune system. By supplementing thymulin, you can help restore youthful immune function, reduce excessive inflammation, and support recovery from illness or chemotherapy. It requires zinc to work properly.
Thymulin Evidence Snapshot
How these guides are reviewed- Regulatory status
- Not FDA approved · research use only
- Dosing guidance
- No established regimen
- Linked evidence
- 1 research sources
- Content updated
- Sep 15, 2026
Research links are provided so readers can inspect the supporting evidence directly. Review the sources.
Quick Answers About Thymulin
Is Thymulin FDA approved?
No. This profile records Thymulin as not FDA approved and for research use only.
More context
Review the regulatory and source details on this page for the current context.
What research supports this Thymulin guide?
This guide links to 1 curated or current research sources.
More context
Open the research section to inspect the source titles, publication details, study types, and available abstracts directly.
Review the Thymulin research sourcesWhat are the side effects of Thymulin?
Reported side effects of Thymulin include Mild injection site irritation.
More context
They are reported or occasional reactions, not a prediction of what any one person will experience.
Is Thymulin safe?
Thymulin has an editorial safety grade of B (Good Safety).
More context
Well-tolerated with rare mild side effects. Natural hormone with good safety record. Safety depends on dose, sourcing, health history and medical supervision, so this page does not call it safe for personal use.
Studied Effects & Mechanisms
T-Cell Development
Promotes CD3, CD4, and CD8 expression on developing T-cells
Cytokine Balance
Reduces inflammatory cytokines (IL-6, TNF-α) while increasing anti-inflammatory IL-10
Neuroendocrine Connection
Modulates hypothalamic-pituitary axis for balanced stress response
Thymus Preservation
Upregulates FOXN1 and IL-7 signaling to protect against thymic involution
From serum thymic factor to thymulin
The earlier name FTS refers to serum thymic factor. In a 1982 paper, Mireille Dardenne and colleagues distinguished the peptide without zinc from its zinc-bound form and proposed the name thymulin for FTS-Zn. Their chemical work examined a one-to-one metal-to-peptide ratio. This nomenclature describes a peptide-metal complex, not a second peptide sequence.
[Dardenne and colleagues, zinc and serum thymic factor, 1982](https://pubmed.ncbi.nlm.nih.gov/6957870/)
Who is this for
People with declining immune function due to aging · Those recovering from chemotherapy or illness · Anyone with autoimmune inflammation issues · People experiencing chronic infections · Those wanting to delay immune system aging
Thymulin price snapshot
In-stock prices from 11 vendors, checked Oct 14, 2026.
- Vendors
- 11
- Listings
- 11
- Observed range
- $29–$84
Market evidence
Thymulin product testing and COAs
We found certificates from a few of the Thymulin vendors we track. Based on the certificates our crawler found; vendors may publish more than we index. Research on this page describes the molecule. Vendor certificates concern particular market samples or batches; they do not change the research evidence or establish clinical safety, sterility, or suitability for use.
Thymulin research
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Compound evidence
Thymulin needs zinc to act, and it curbed inflammation in mice
Zinc switches thymulin on, and the hormone curbed inflammation in mouse studies. Its cited human data are one 1982 case series in three children.
Compound evidence
Thymulin prolonged the growth phase of cultured human hair follicles
Thymulin at 10 pg/mL prolonged the growth phase of human scalp follicles in organ culture. That one study is unreplicated, and no controlled hair trial exists.