P21 vs Semax
Which should you choose? Here's what you need to know.
The short answer
P21 and Semax are both cognitive / neuro peptides, but they work differently. A synthetic peptide derived from ACTH (4-10) developed in Russia as a nootropic and neuroprotective agent. Available as a prescription nasal spray in Russia. Compare vendor pricing and availability below.
P21
Cognitive / NeuroSemax
Cognitive / NeuroA synthetic peptide derived from ACTH (4-10) developed in Russia as a nootropic and neuroprotective agent. Available as a prescription nasal spray in Russia.
Price & availability
Once you've decided which peptide fits your needs, here's how they compare on price and vendor options.
P21
Semax
$61.98
Starting from
$25.00
$15.22
Avg. price per mg
$12.77
9
Vendors selling it
59
6 options
In stock now
59 options
9.0/10
Top trust score
9.1/10
0
Purity tests on file
0
Ready to buy?
Our top-rated vendor for each, based on trust scores, purity testing, and price.
Some outbound links may earn us a commission. Vendors cannot pay to improve rankings.
Best P21 Vendor
7.0/10
$198.00(10mg)
Best Semax Vendor
8.7/10
$30.00(10mg)
Where does this data come from?
We check vendor prices every day and pull in real purity test results from independent labs — not vendor claims. No vendor can pay to rank higher. See our full methodology.