Thymalin vs Thymosin Alpha-1
Which should you choose? Here's what you need to know.
The short answer
Thymalin and Thymosin Alpha-1 are both immune / inflammation peptides, but they work differently. A bioregulatory peptide extracted from the thymus gland. Studied for immune system regulation and potential anti-aging effects on immune function. A thymic peptide that modulates immune function. FDA-orphan drug approved and used clinically in many countries for immune support. Compare vendor pricing and availability below.
On 20 Sep 2026 Peptide Compare tracked 18 vendors selling Thymalin, cheapest in stock $2.00 per mg at Ruo Bio, and 37 selling Thymosin Alpha-1, cheapest $3.85 per mg at Step One.
Thymalin
Immune / InflammationA bioregulatory peptide extracted from the thymus gland. Studied for immune system regulation and potential anti-aging effects on immune function.
Thymosin Alpha-1
Immune / InflammationA thymic peptide that modulates immune function. FDA-orphan drug approved and used clinically in many countries for immune support.
Price & availability
Once you've decided which peptide fits your needs, here's how they compare on price and vendor options. Prices verified Sep 20, 2026.
Thymalin
Thymosin Alpha-1
$40.00
Starting from
$37.00
$7.49
Avg. price per mg
$8.69
18
Vendors selling it
37
17 options
In stock now
38 options
7.6/10
Top trust score
9.0/10
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Where does this data come from?
We re-check vendor prices continuously and score vendors on Finnrick blind-test results — samples bought anonymously and sent to a lab, not vendor claims. No vendor can pay to rank higher. See our full methodology.