# P21

> Synthetic nootropic peptide researched for synaptic plasticity.

Source: https://peptides.cafe/peptide/p21
Category: Nootropic · Neuroprotection
Tag: Cognition · Neuroprotection

## Mechanism
A synthetic peptide derived from cerebrolysin. Research suggests it promotes synaptic plasticity by enhancing BDNF expression and inhibiting prolyl endopeptidase, an enzyme involved in neurodegenerative processes.

## Research areas
- Synaptic plasticity and memory
- Neuroprotection in Alzheimer's models
- Cognitive recovery after brain injury

## Common research protocols
- Nasal spray research: Intranasal administration studied for direct CNS penetration in cognitive research.

## Study summaries
- "P21 promotes synaptic plasticity in aged rodents" — Neuroscience Letters (2015): Enhanced dendritic spine density and BDNF expression in hippocampal tissue.

## Considerations
- Experimental; limited human data available.
- Not FDA-approved.

## Disclaimer
Educational content only. Not medical advice, diagnosis, or treatment. Most research peptides are not FDA-approved for human therapeutic use. Consult a licensed clinician before any use.