Thymalin
A peptide from the thymus gland, studied for immune regulation and immune aging.
Also listed as Thymic peptide.
Peptide Compare tracked 18 vendors selling Thymalin on 10 Oct 2026. The cheapest in-stock 20 mg vial is $2.00 per mg at Ruo Bio, 52% under the $4.20 median. Prices are scraped from vendor sites; trust scores come from Finnrick blind tests.
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Best value right now · 20 mg
Ruo Bio
IN STOCKUNTESTED
Per mg52% under the $4.20 median
Vial price20 mg · verified Oct 10
Avg per mg · 20 mg
$4.41−5.3%
Ranged $4.41 – $5.36 across 18 vendorsCompare 6 vendors · 20 mg
Across all sizes, verified in-stock listings run $40.00 to $390.00 from 9 vendors.
VendorStock
Thymalin prices verified Oct 10, 2026
$2.00/mgRuo Bio · $40.00
Buy best priceSee how Thymalin moved against the rest of the catalogue in the Peptide Price Index: median price per mg now versus 30 and 90 days ago, every tracked peptide, with a CSV.
Thymalin price by vial size
| Vial size | Lowest per mg | Vial price | Vendor |
|---|---|---|---|
| 5 mg | $15.80 | $78.98 | Behemoth Labz1 vendor carries it |
| 10 mg | $4.60 | $45.99 | Modern Research11 vendors carry it |
| 20 mg | $2.00 | $40.00 | Ruo Bio6 vendors carry it |
| 50 mg | $6.38 | $319.19 | Behemoth Labz1 vendor carries it |
| Other | $4.56 | $114.00 | Biotech Peptides1 vendor carries it |
Verified 10 Oct 2026. Lowest figures are in-stock listings checked within the last week, with any coupon applied; a size with none says so.
Price movement · 30 days
−0.8%median per mg, all sizes
Cheapest ever recorded: $1.58/mg on Aug 7. Today is 26.6% above that low.See our top-ranked Thymalin vendors
Ranked by Finnrick trust score, independent lab testing, and price.
Compare Thymalin head-to-head
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Quick Summary
A peptide preparation extracted from calf thymus, registered in Russia and studied there in elderly patients for age-related immune decline. Available from 18 vendors, priced from $40.00 to $390.00.
Research: The mortality and infection figures once quoted here come from Khavinson and Morozov, Neuroendocrinol Lett 2003;24(3/4):233-240. That study was unblinded, had no placebo arm, and its 266 participants were the total across every treatment group rather than the number who received thymalin. It has not been replicated outside the original Russian group, and the effect sizes have been removed from this page for that reason.
Side effects: No adverse event table from a controlled trial has been published
Approved in RussiaRegistered in Russia since the 1980s. Not approved by the FDA or the EMA.
- 15 of 18 vendors currently have it in stock
- Highest-rated vendor: Peptidology (7.6 Finnrick score)
- Most common vial size: 10mg
- Category: Immune / Inflammation — Immune modulators and anti-inflammatory peptides
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