Research & Guides · Longevity

Longevity, written by clinicians.

25 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

Pages

Avg Read

9 Min

Updated

2026

NMN as a precursor to NAD+ for cellular health

Featured · Longevity

NMN Benefits: What the Science Actually Shows (and Why the Form Matters)

NMN benefits start with one fact: NMN is an oral precursor your body converts into NAD+. Early research suggests it can raise NAD+ levels, but human evidence is still developing — and how well it works depends on absorption. An honest, physician-reviewed look.

Dr. Richard Dentico, MD · 9 min read

Read article

Managing chronic stress to support healthy cortisol levels

Longevity · 9 min read

High Cortisol: Signs, Causes, and How to Lower It Naturally

High cortisol from chronic stress is often linked to poor sleep, "wired but tired" energy, anxiety and appetite changes, but only testing confirms it. A physician's guide to the signs, causes, testing and how to lower cortisol naturally.

A woman lifting a barbell in a gym, representing steady, natural energy and strength

Longevity · 8 min read

How to Increase Energy Levels Naturally (and Why They Decline With Age)

How to increase energy levels naturally: the best-supported ways are consistent sleep, movement, balanced meals, stress management and hydration, and they matter more with age. A physician's guide.

Physician reviewing an individualized NAD+ dosing plan with a patient

Longevity · 7 min read

NAD+ Dosage: What Actually Determines Your Injection Protocol

NAD+ dosage for injections 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.

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, Risks, and How Injection Compares

NAD IV therapy, explained by a physician: what it is, the benefits people pursue, 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, 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.