P21vsSelank
P21 vs Selank — independent comparison of uses, administration, pricing across providers, and key differences. Last reviewed April 21, 2026.
Quick Verdict
Based on clinical evidence and real patient data
A 21-amino-acid peptide that mimics the action of ciliary neurotrophic factor (CNTF). Studied for neurogenesis, cognitive improvement, and neuroprotection. Shows promise in animal models for enhancing memory consolidation and protecting against neurodegenerative decline.
A synthetic peptide derived from the naturally occurring immunomodulatory peptide tuftsin. Developed as an anxiolytic with nootropic properties, it modulates GABA and serotonin systems without sedation.
Best choice depends on your insurance, budget, and treatment history.Take the quiz to get a personalized recommendation.
P21 vs Selank: At a Glance
Full comparison across all key factors.
| Factor | P21 | SelankALLY PICK |
|---|---|---|
| Category | cognitive | cognitive |
| Also Known As | CNTF analog, Colostrinin fragment | TP-7 |
| Administration | Intranasal spray | Intranasal spray |
| Prescription | Required | Required |
| Providers | 3 providers | 4 providers✓ Better |
| Common Uses |
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Data sourced from FDA prescribing information and peer-reviewed clinical trials. Prices reflect telehealth platform costs as of April 21, 2026. See our methodology.
Pricing by Provider
3 providers offer both P21 and Selank.
| Provider | P21 | Selank | Consultation | Lab Testing |
|---|---|---|---|---|
 | $55/one-time | $45/one-time | Async Telehealth | No |
 | $180/monthly | $120/monthly | Video Telehealth | Yes |
 | $230/monthly | $160/monthly | Video Telehealth | Yes |
 | Not offered | $140/monthly | Video Telehealth | Yes |
Key Differences
P21
A 21-amino-acid peptide that mimics the action of ciliary neurotrophic factor (CNTF). Studied for neurogenesis, cognitive improvement, and neuroprotection. Shows promise in animal models for enhancing memory consolidation and protecting against neurodegenerative decline.
Selank
More ProvidersA synthetic peptide derived from the naturally occurring immunomodulatory peptide tuftsin. Developed as an anxiolytic with nootropic properties, it modulates GABA and serotonin systems without sedation.
Which Is Right for You?
Choose P21if…
- You want a cognitive medication
- You prefer intranasal spray administration
- 3 providers available on our platform
- Your primary goal is neurogenesis
- Your primary goal is memory consolidation
Choose Selankif…
- You want a cognitive medication
- You prefer intranasal spray administration
- You want more provider options (4 available)
- Your primary goal is anxiety reduction
- Your primary goal is cognitive enhancement
Frequently Asked Questions
What is the difference between P21 and Selank?
Which is cheaper, P21 or Selank?
Can I switch from P21 to Selank?
Medical Disclaimer
This comparison is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider before starting, stopping, or changing any medication. Individual results may vary. The information presented reflects publicly available data and may not account for your specific health situation.