Thymulin is a naturally occurring peptide hormone produced by the thymus, studied for its role in immune-cell regulation and, in some research, sleep and inflammatory signaling.
Not the same as "Thymalin" — a real, important distinction
Thymulin (also called FTS, "facteur thymique sérique") is a genuinely well-characterized, internationally-recognized zinc-dependent nonapeptide hormone, discovered by Jean-François Bach and colleagues in Paris in 1975 — distinct from "Thymalin," a differently-named calf-thymus extract bioregulator from the Russian Khavinson research lineage (see the Khavinson bioregulator peptides on this site for that separate research program). Thymulin has real, independently-published Western literature behind it, unlike most of the compounds in that other family.
Benefits
Thymulin's defining feature: its biological activity is strictly zinc-dependent — without zinc bound in the molecule, it's biologically inactive. It induces T-cell differentiation and enhances multiple T-cell subset functions, with suppressor T-cell effects specifically flagged by its discoverers as the most clinically promising application. Bach & Dardenne, Med Oncol Tumor Pharmacother, 1989
Dosage
No modern human dosing trial was independently verified in this research pass — the foundational literature (1970s-80s) established the mechanism and zinc-dependence, not necessarily a specific validated dose for the product as currently sold.
What is Thymulin researched for?+
Immune system regulation is the primary research theme, given its role as a thymic hormone.
Is Thymulin FDA-approved?+
No, it is sold as a research compound only.
Is Thymulin the same as Thymosin Alpha-1?+
No, they are different thymic-derived peptides studied for overlapping but distinct immune research questions.
Looking for something specific, or placing a wholesale order? Send us a DM or email.