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Thymulin vs Thymalin: Different Molecules
This distinction matters because search queries conflate them. Thymulin (facteur thymique serique/FTS) is a single, defined molecule with known structure and mechanism. Thymalin is a crude extract from calf thymus containing multiple peptides, developed by Kha
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- This distinction matters because search queries conflate them. Thymulin (facteur thymique serique/FTS) is a single, defined molecule with known structure and mechanism. Thymalin is a crude extract from calf thymus containing multiple peptides, developed by Khavinson in Russia⁴¹.
- Thymalin’s geroprotective claims — including lifespan extension and immune normalization — come almost entirely from Khavinson’s research group with no independent Western replication. The COVID-19 thymalin trial (n=80, unblinded) reported halved hospital mortality, but Khavinson was co-author at his co-affiliated institution⁴². These are not equivalent molecules and should not be treated interchangeably.