Willow vs Peter MD: Which longevity Clinic Is Better in 2026?
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Short answer
Willow and Peter MD tie at 6.5/10, so it comes down to what they can prescribe and what they disclose.
Willow and Peter MD are essentially tied, 6.5/10 vs 6.4/10.
Willow · from $199/mo billed monthly until cancelled
Willow
Names its company, 36 physicians and five pharmacies, but not the dose its $199 NAD+ vial contains or which pharmacy makes it.
from $199/mo billed monthly until cancelled
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NAD+ as injection or capsule, plus sermorelin and metformin, priced by supply rather than by month.
from $369 for an 8 to 10 week supply (2 vials)
Read ReviewWillow vs Peter MD, side by side
| Feature | Willow | Peter MD |
|---|---|---|
| Our score | 6.5/10 | 6.4/10 |
| Starting price | $199/mo billed monthly until cancelled | $369 for an 8 to 10 week supply (2 vials) |
| Medication types | nad-injection | nad-injection, nad-capsule, sermorelin-injection, metformin, bloodwork |
| Best for | — | NAD+ in two forms, plus metformin |
| Overall ranking | #21 | #23 |
| Real monthly cost (25%) | 6.0 | 6.5 |
| Prescriber & follow-up (30%) | 7.5 | 6.5 |
| What they can prescribe (20%) | 5.5 | 8.0 |
| What they disclose (25%) | 6.5 | 5.0 |
Sources: Willow pricing verified on startwillow.com, Peter MD pricing verified on getpetermd.com
Pros & cons
Willow
Pros
- + Names its legal entity with a street address, 36 US-licensed physicians with individual bio pages, and all five partner pharmacies with full addresses
- + One published monthly price that states what it includes: the vial, syringes, needles, doctor access and free shipping
- + States plainly that compounded NAD+ is not FDA-approved, on the product page and its safety page
Cons
- − Weaker on What they can prescribe (5.5/10)
- − Weaker on Real monthly cost (6.0/10)
- − Weaker on What they disclose (6.5/10)
Peter MD
Pros
- + NAD+ as both injection and capsule, plus sermorelin and metformin
- + Publishes the states it cannot ship to, on the product page itself
- + Comprehensive bloodwork sold openly alongside treatment
Cons
- − Not available in 2 states
- − Weaker on What they disclose (5.0/10)
- − Weaker on Real monthly cost (6.5/10)
The bottom line
After scoring all 31 clinics on our 4-criterion rubric (real monthly cost, prescriber & follow-up, what they can prescribe and what they disclose), Willow and Peter MD are essentially tied (6.5 vs 6.4/10). There is no clear overall winner here, so the right choice comes down to what matters most to you.
Choose Willow if you want this option. From $199/mo billed monthly until cancelled.
Visit →Choose Peter MD if you want nad+ in two forms, plus metformin. From $369 for an 8 to 10 week supply (2 vials).
Read Review →Editor's overall pick
Not sold on either? Our highest-rated clinic overall is HealthRX (8.5/10) from $161/mo on a 1-month plan, renewing monthly. Read the review →
Ready to start longevity care?
Willow and Peter MD are essentially tied. Either is a solid choice.
Frequently asked questions
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How we score: every clinic is rated on five weighted criteria from documented evidence. Prices checked weekly. See each review for that clinic's own verification status. Scores are never influenced by affiliate commissions. “Visit” links may be affiliate links that support our work. Educational information only. Not medical advice.