iNot medical advice. We don’t recommend any dose. Every dose below is a quote from the person named, describing their views or their own use. Thymalin is registered as a medicine in Russia but not in the EU, UK or US. Products sold online are research chemicals.
2 statements from 2 people. Each one is word for word: we add punctuation only and mark cuts with […]. The chips repeat the exact words used.
“Dosing Guidelines: 5–10mg 1x/day for 3-10 days, repeat every 6–12 months”
Context: From his immune stack. In his anti-aging stack in the same article he gives “5–10mg 1x/day for 10 days, cycle 1–2x/year”. He writes that these are general guidelines and that he is not a doctor.
“Dose: 2mg. Timing: PM. Frequency: Every day. Duration: 20 days in a row, 3x per year. Administration: SubQ injection. […] Jay’s Note: Thymalin and Epitalon are run together as a 20-day longevity cycle — this is exactly how the original Khavinson research was structured. Don’t separate them. Don’t extend the cycle. Twenty days, three times a year, and you’re letting the biology work the way it was designed to.”
Context: The Thymalin card itself lists no product source. Quoted from a protocol card on his website (the field labels Dose, Timing, Frequency, Duration and Administration are his). The protocol pages say every protocol has been “personally tested, refined, and used by Jay Campbell”, and most cards link to a product from BioLongevity Labs, a company he co-founded.
0 statements from 0 people about risks and how strong the evidence is.
No expert safety statements are listed yet.
Context, not a dosing guide. Most thymalin research comes from Professor Khavinson’s institute in St Petersburg. The long-term study below was not randomised in the modern sense and has not been independently repeated. None of it sets a dose for self-use.
| Study | Studied in | What the study used | What it found |
|---|---|---|---|
| Khavinson & Morozov, 2003, Neuro Endocrinol LettPubMed 14523363 | 266 older people followed for 6–8 years | Thymalin and/or epithalamin courses during the first 2–3 years | Lower death rate reported in the thymalin groups vs controls; single research group |
No. Both come from the thymus, but thymosin alpha-1 is a single defined peptide; thymalin is a peptide complex first made as a thymus extract.
Ben Greenfield describes 3–10 day courses repeated every 6–12 months; Jay Campbell describes 20 days in a row, three times a year, alongside epitalon. See their quotes.
We do not write our own dose ranges. The protocol cards show, word for word, what named people have publicly said, with their caveats and a link to the source.
Word-for-word statements about how thymalin is used, each with a link to the source. Thymalin is a mix of short peptides first extracted from the thymus gland in Russia; it is discussed for immune support and ageing. The research is listed separately as context.
Last reviewed 11 Oct 2026 · Compiled by the Peptide Dosing editorial team · How we check quotes