P21 vs Selank
Which should you choose? Here's what you need to know.
The short answer
P21 and Selank are both cognitive / neuro peptides, but they work differently. A synthetic analog of the immunomodulatory peptide tuftsin, developed in Russia for its anxiolytic and nootropic properties. Compare vendor pricing and availability below.
On 18 Sep 2026 Peptide Compare tracked 7 vendors selling P21, cheapest in stock $8.50 per mg at Soma Chems, and 58 selling Selank, cheapest $1.63 per mg at Bio Pepz.
P21
Cognitive / NeuroSelank
Cognitive / NeuroA synthetic analog of the immunomodulatory peptide tuftsin, developed in Russia for its anxiolytic and nootropic properties.
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.
P21
Selank
$84.99
Starting from
$15.00
$47.57
Avg. price per mg
$5.73
7
Vendors selling it
58
5 options
In stock now
61 options
7.0/10
Top trust score
9.1/10
Ready to buy?
Our top-rated vendor for each, based on trust scores, purity testing, and price.
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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.