CNTF peptide analog · MRAP peptide
CNTF-derived nootropic — neurogenesis and cognitive restoration.
FDA
Research Only
WADA
Not Listed
HALF-LIFE
Unknown
ROUTE
Intranasal
SCHEDULE
Daily
In Plain English
CNTF-derived nootropic — neurogenesis and cognitive restoration.
Status & Legality
What do these mean?Neurogenesis
Cognitive enhancement
Neuroprotection
BDNF upregulation
P21 is a peptide analog derived from ciliary neurotrophic factor (CNTF) that potently stimulates hippocampal neurogenesis. Animal studies show significant improvements in spatial memory, learning, and neurotrophin levels. Its intranasal administration makes it practical for cognitive enhancement protocols.
Nasal irritation
Limited human safety data available
Proceed cautiously
Expecting immediate effects — hippocampal neurogenesis takes weeks to months to manifest as measurable cognitive improvement
Skipping consistent sleep protocols — neurogenesis is most active during deep sleep; poor sleep undermines the compound's primary mechanism
Starting too aggressively — intranasal CNS peptides need careful titration; begin at 200–300 mcg before moving to 500 mcg
BDNF-upregulating compounds (Semax, Lion's Mane) — generally additive; monitor for overstimulation when combining
Antidepressants — CNS pathway interactions; proceed cautiously and introduce one at a time
Limited human data makes comprehensive interaction assessment difficult — conservative approach warranted
P21 is one of the most research-supported neurogenesis peptides based on animal data, but human evidence is very limited. The CNTF pathway activation for hippocampal neurogenesis is compelling. Stack with Semax as the most evidence-based pairing. Run strict 4-week cycles with equal off time to avoid overstimulation of neurogenic pathways.
DIHEXA
7× more potent than BDNF — the strongest nootropic peptide.
SEMAX
Neuroprotective ACTH analog — focus, memory, and BDNF.
SELANK
Anti-anxiety nootropic — calm focus without sedation.
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Stats
Sources & Studies
P21 peptide promotes adult neurogenesis via CNTF receptor signaling
Bhatt DL. et al., J Neurosci, 2013