§ Same category · Cognitive peptides
P-21 vs Semax
Side-by-side price comparison across every tracked vendor. Updated every 4–6 hours.
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P-21
5
vendors tracked
from $9.80/mg
Semax
23
vendors tracked
from $2.52/mg
◎ Cheapest $/mg:Semax at $2.52/mg
P-21
CNTF-mimetic cognitive peptide
Operational
$116.00
$23.20/mg
In stock◎ Best $/mg
| Vendor | Grade | Risk | Price | $/mg | Trend | Stock | |
|---|---|---|---|---|---|---|---|
| Core Peptides US | A | Operational | $116.00 ◎ Best $/mg | $23.20 | In stock | Buy with code → |
Sort:
Last crawl 2026-05-09Sort:
2026-05-09Semax
Nootropic ACTH fragment
Operational
$24.83
$4.97/mg
In stock◎ Best $/mg
B-
Watch$39.99
$8.00/mg
In stock▲ 61.1% vs best
| Vendor | Grade | Risk | Price | $/mg | Trend | Stock | |
|---|---|---|---|---|---|---|---|
| Research Peptides Europe EU | A | Operational | $24.83 ◎ Best $/mg | $4.97 | In stock | Buy with code → | |
| Modified Aminos US | B- | Watch | $39.99 ▲ 61.1% | $8.00 | In stock | Visit → |
Sort:
Last crawl 2026-05-09Sort:
2026-05-09About P-21
An 11-mer fragment derived from ciliary neurotrophic factor (CNTF), studied for neurogenesis and cognitive enhancement in preclinical models.
About Semax
A synthetic heptapeptide based on an ACTH(4-10) fragment. Studied in Russian neurology for neuroprotection and cognitive enhancement.