Protocol MD

Research & Guides · Longevity

Longevity, written by clinicians.

20 physician-reviewed articles on longevity — what each compound does at the cellular level, who it's for, and what the evidence does and doesn't establish.

Articles

20

Pages

3

Avg Read

9 Min

Updated

2026

Physician reviewing an individualized NAD+ dosing plan with a patient

Featured · Longevity

NAD+ Dosage: What Actually Determines Your Injection Protocol

NAD+ injection dosing is individualized — there's no universal chart. Here's the general ranges people use, how frequency works, and what a physician weighs to set your dose.

Dr. Richard Dentico, MD · 7 min read

Read article
Close-up of a woman's sunlit face, neck, and shoulders with dewy, healthy-looking skin against a clear blue sky.

Longevity · 9 min read

NAD+ IV Therapy: Benefits, Cost, and How Injection Compares

NAD IV therapy, explained by a physician: what it is, the benefits people pursue, cost, and how clinic IV drips compare to a convenient at-home NAD+ injection.

Glutathione therapy administered under physician supervision

Longevity · 9 min read

Glutathione IV vs. Injection: An Honest Comparison of Delivery Routes

Glutathione IV vs. injection vs. oral, compared honestly by a physician: how each route is absorbed, what it costs, convenience, safety, and how to choose.

A gray scoop holding white supplement powder resting in a bed of more powder, evoking glutamine, the widely sold supplement-powder amino acid, in the glutamine versus glutathione comparison.

Longevity · 8 min read

Glutamine vs Glutathione: The Real Difference, Explained

Glutamine vs glutathione, by physicians: one is an amino acid, the other an antioxidant tripeptide your body partly builds from it. The real difference.

NMN and NAD+ molecule comparison

Longevity · 9 min read

NMN vs NAD+: The Difference, Explained Simply (2026)

NMN vs NAD+ explained by a physician: NMN is a precursor your body converts into NAD+. The real difference, which absorbs better, whether NMN is 'better,' and how the form you take matters most.

A woman resting outdoors at sunset, looking out over the water

Longevity · 8 min read

NAD+ Side Effects: What to Expect, Especially With IV and Injections

NAD+ side effects explained by a physician: the mild GI effects of oral, the characteristic infusion 'rush' with IV and injections, how long they last, and when to call your doctor.

A person outdoors at sunset, wrapped against the evening air

Longevity · 9 min read

Glutathione Side Effects: What to Expect by Form (Oral, Injection, IV)

Glutathione side effects explained honestly by a physician — the mild GI effects of oral, the injection-site and rare serious reactions with IV, plus the regulatory safety warnings you should know.

503A US PharmacyPhysician-PrescribedUSP-Compliant Compounding

Built around you. Real medicine, designed by your physician.

Take the 60-second assessment