Thymosin Alpha-1 vs VIP
Which should you choose? Here's what you need to know.
The short answer
Thymosin Alpha-1 and VIP are both immune / inflammation peptides, but they work differently. A thymic peptide that modulates immune function. FDA-orphan drug approved and used clinically in many countries for immune support. Vasoactive Intestinal Peptide, a neuropeptide with potent anti-inflammatory and immunomodulatory effects. Studied for mast cell conditions and gut health. Compare vendor pricing and availability below.
On 18 Sep 2026 Peptide Compare tracked 37 vendors selling Thymosin Alpha-1, cheapest in stock $3.85 per mg at Step One, and 30 selling VIP, cheapest $3.90 per mg at Peptides Collective.
Thymosin Alpha-1
Immune / InflammationA thymic peptide that modulates immune function. FDA-orphan drug approved and used clinically in many countries for immune support.
VIP
Immune / InflammationVasoactive Intestinal Peptide, a neuropeptide with potent anti-inflammatory and immunomodulatory effects. Studied for mast cell conditions and gut health.
Price & availability
Once you've decided which peptide fits your needs, here's how they compare on price and vendor options. Prices verified Sep 18, 2026.
Thymosin Alpha-1
VIP
$37.00
Starting from
$34.99
$8.69
Avg. price per mg
$11.96
37
Vendors selling it
30
38 options
In stock now
28 options
9.0/10
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.