Monograph
Thymulin: A Practical Guide
Overview Thymulin (also known as FTS — facteur thymique sérique, or serum thymic factor) is a nonapeptide (9 amino acids; pyroglutamate-Ala-Lys-Ser-Gln-Gly-Gly-Ser-Asn) produced by thymic epithelial cells (TECs) in the thymus gland. First isolated by Bach and colleagues in France in the 1970s…
By Kristopher Crawford
·
13 May 2026
·
4 min read
Overview Thymulin (also known as FTS — facteur thymique sérique, or serum thymic factor) is a nonapeptide (9 amino acids; pyroglutamate-Ala-Lys-Ser-Gln-Gly-Gly-Ser-Asn) produced by thymic epithelial cells (TECs) in the thymus gland. First isolated by Bach and colleagues in France in the 1970s…
In the full monograph
- What it is, and how it works
- What the evidence shows — randomized trials, observational data, animal studies, graded and cited
- Dose, form, and timing
- What to expect, and how soon
- Who should be careful, and what to check first
- The verdict
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