P21
Also known as: P21 peptide, CNTF analogue fragment
P21 is a synthetic peptide studied as a small fragment related to ciliary neurotrophic factor (CNTF) signaling.
Caliber Peptide Index tracks P21 across 5 research-peptide vendors, with the lowest listed price at $9.80/mg (10mg) at Modern Aminos as of 2026-06-01. Prices below are normalized to dollars per milligram so different vial sizes can be compared on an equal basis. P21 is sold by third-party vendors for research use only.
Research Applications
Investigated in laboratory research on neurotrophic signaling.
Safety Considerations
An experimental research compound, not approved for human use. For laboratory research only — not for human consumption.
Available From 5 Vendors — Sorted by $/mg
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Frequently asked
- How many vendors sell P21?
- Caliber Peptide Index currently tracks 5 research peptide vendors listing P21.
- What is the lowest tracked price for P21?
- The lowest tracked price for P21 is $9.80/mg (10mg) at Modern Aminos. Prices are sorted by dollars per milligram so different vial sizes can be compared on an equal basis.
- How often are P21 prices updated?
- Vendor prices are refreshed by our automated scraper (most recent update: 2026-06-01). Always confirm the current price on the vendor's site before purchase.
Caliber Peptide Index is a directory. We do not test, score, or endorse any vendor. Prices listed are what each vendor publishes; verify on the vendor's site before purchase.
Products listed for research purposes only — not for human consumption. Wiki content is summarized from publicly available research literature and is not medical advice.