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№ 052

P-21

Synthetic ciliary neurotrophic factor (CNTF)-mimetic peptide. Targets neurogenesis. Pre-clinical / early research compound.

Nootropic
Evidence: Anecdotal
Half-life
~hours
Route
Subcutaneous
Cycle
Short courses
Schedule
Daily
In plain English

P-21 is a synthetic peptide that mimics CNTF (ciliary neurotrophic factor). Targets neurogenesis pathways. Pre-clinical research compound — no human dosing data exists.

Status & legality
Natty?
Not natty
FDA
Not approved

Not FDA approved. Pre-clinical.

Compounding
Not classified

Not formally categorized in the FDA bulks lists.

WADA
Not listed
Prescribed

Not prescribed in conventional medicine.

Who it's for

  • →Researchers studying CNTF pathways
  • →Cognitive-decline research contexts
  • →Educational reference — limited human data

What to expect

  1. Week 1

    Subtle. Animal-model markers begin shifting.

  2. Week 4

    Cycle endpoint in most pre-clinical protocols.

  3. Week 8

    No human long-term data.

How it works (mechanism)

Synthetic peptide that mimics CNTF (ciliary neurotrophic factor) action on neurogenesis pathways. Pre-clinical only — mechanism partially characterized.

Dosing protocol

No standardized human dose. Animal-model dosing is per-kg.

Stacks well with

Standalone — too experimental

Side effects

01Limited human data
02Generally well tolerated in animal models

When NOT to use

  • ⚠Pregnancy / nursing
  • ⚠Anyone risk-averse to pre-clinical compounds

Common mistakes

  • • Treating it as a defined nootropic protocol
  • • Long cycles without safety data

Educational only. User-specific dosing is between you and a qualified provider.

Frequently asked

What is P-21?+
P-21 is a synthetic peptide that mimics CNTF (ciliary neurotrophic factor). Targets neurogenesis pathways. Pre-clinical research compound — no human dosing data exists.
Is P-21 FDA approved?+
Not FDA approved. Pre-clinical.
Is P-21 banned by WADA?+
P-21 is not currently on the WADA prohibited list.
Are you still natty after taking P-21?+
No. P-21 is a performance-enhancing peptide and would disqualify a strict natty claim.
Do doctors prescribe P-21?+
Not prescribed in conventional medicine.
What's the typical dose of P-21?+
No standardized human dose. Animal-model dosing is per-kg.
What are the side effects of P-21?+
Common side effects include: Limited human data; Generally well tolerated in animal models. Less common effects and full safety details are on the entry page.
How long until P-21 starts working?+
Subtle. Animal-model markers begin shifting.

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