§ Same category · Cognitive peptides
P-21 vs PE-22-28
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
PE-22-28
8
vendors tracked
from $4.50/mg
◎ Cheapest $/mg:PE-22-28 at $4.50/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:
2026-05-09PE-22-28
Synthetic antidepressant peptide
B
Operational$49.99
$10.00/mg
In stock◎ Best $/mg
| Vendor | Grade | Risk | Price | $/mg | Trend | Stock | |
|---|---|---|---|---|---|---|---|
| Welli Labs US | B | Operational | $49.99 ◎ Best $/mg | $10.00 | In stock | Buy with code → |
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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 PE-22-28
A seven-residue peptide derived from the spadin sequence (SORT1 fragment), studied for rapid-acting antidepressant effects via TREK-1 channel blockade.