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.

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9 Min

Updated

2026

Featured · Longevity

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.

Richard Dentico, MD · 9 min read

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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, injection-site soreness with shots, 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 Infusion)

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.

A smiling woman outdoors in warm natural light

Longevity · 10 min read

NAD+ Benefits: What It Actually Does, and What the Science Really Shows

NAD+ benefits explained honestly by a physician: what people seek it for, what the research shows and has not shown, what's hype, and how the form you take matters.

A medical syringe filled with blue liquid on a light background

Longevity · 7 min read

NAD Injections Near Me: Do You Actually Need a Clinic Nearby?

NAD injections near me: you may not need a clinic at all. An honest comparison of local IV bars and physician-prescribed at-home NAD injections available in all 50 states — oversight, and how to choose.

Water droplets on a clear surface — glutathione, the body's master antioxidant, working at the cellular level.

Longevity · 8 min read

Glutathione Benefits: What the "Master Antioxidant" Actually Does

Glutathione is your body's master antioxidant and a liver-detox cofactor — that part's settled. The disease 'benefits' are mostly still being studied. A physician-reviewed look at what's real, and what the delivery route does and does not change.

Longevity · 12 min read

What Is Glutathione? How It Works, Its Forms, and How the Routes Compare

What glutathione is, what it does in your cells, and how oral, injectable and IV forms differ, with the honest state of the evidence. Physician-prescribed, 503A compounded.