NAD+vsP21
NAD+ vs P21 — 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 coenzyme found in every living cell, critical for energy metabolism and cellular repair. Levels decline with age, and supplementation is used to support longevity and cognitive function.
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.
Best choice depends on your insurance, budget, and treatment history.Take the quiz to get a personalized recommendation.
NAD+ vs P21: At a Glance
Full comparison across all key factors.
| Factor | NAD+ALLY PICK | P21 |
|---|---|---|
| Category | anti-aging | cognitive |
| Also Known As | Nicotinamide adenine dinucleotide | CNTF analog, Colostrinin fragment |
| Administration | Subcutaneous injection or IV infusion | Intranasal spray |
| Prescription | Required | Required |
| Providers | 10 providers✓ Better | 3 providers |
| Common Uses |
|
|
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
2 providers offer both NAD+ and P21.
| Provider | NAD+ | P21 | Consultation | Lab Testing |
|---|---|---|---|---|
 | $220/monthly | $180/monthly | Video Telehealth | Yes |
 | $300/monthly | $230/monthly | Video Telehealth | Yes |
| Price unavailable | Not offered | Hybrid | No | |
| Price unavailable | Not offered | Async Telehealth | No | |
 | Not offered | $55/one-time | Async Telehealth | No |
| Price unavailable | Not offered | Async Telehealth | No | |
| Price unavailable | Not offered | Hybrid | No | |
| Price unavailable | Not offered | Async Telehealth | No | |
| Price unavailable | Not offered | Hybrid | No | |
| Price unavailable | Not offered | Hybrid | No | |
| Price unavailable | Not offered | Hybrid | No |
Key Differences
NAD+
More ProvidersA coenzyme found in every living cell, critical for energy metabolism and cellular repair. Levels decline with age, and supplementation is used to support longevity and cognitive function.
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.
Which Is Right for You?
Choose NAD+if…
- You want a anti-aging medication
- You prefer subcutaneous injection or iv infusion administration
- You want more provider options (10 available)
- Your primary goal is anti-aging
- Your primary goal is energy and focus
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
Frequently Asked Questions
What is the difference between NAD+ and P21?
Which is cheaper, NAD+ or P21?
Can I switch from NAD+ to P21?
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.