§ Same category · Cognitive peptides
P-21 vs Selank
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
Selank
26
vendors tracked
from $3.00/mg
◎ Cheapest $/mg:Selank at $3.00/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 → |
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Last crawl 2026-05-09Sort:
2026-05-09Selank
Anxiolytic neuropeptide
Operational
$19.43
$3.89/mg
In stock◎ Best $/mg
Operational
$25.20
$5.04/mg
In stock▲ 29.7% vs best
B-
Watch$39.99
$8.00/mg
In stock▲ 105.8% vs best
| Vendor | Grade | Risk | Price | $/mg | Trend | Stock | |
|---|---|---|---|---|---|---|---|
| Research Peptides Europe EU | A | Operational | $19.43 ◎ Best $/mg | $3.89 | In stock | Buy with code → | |
| ResearchPeptide UK UK | B- | Operational | $25.20 ▲ 29.7% | $5.04 | In stock | Visit → | |
| Modified Aminos US | B- | Watch | $39.99 ▲ 105.8% | $8.00 | In stock | Visit → |
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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 Selank
A synthetic heptapeptide derived from tuftsin, studied in Russian neuropharmacology research for anxiolytic and nootropic effects.