Health Guide — Page 5

The peptide library, written by clinicians.

48 long-form articles on peptide therapy — what each compound does at the cellular level, who it's for, what the FDA says about it, and where the gray-market vendors get the story wrong. Every guide is reviewed by a US-licensed physician and updated as evidence evolves.

Articles

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.

Dr. Richard Dentico, MD · 9 min read

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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.

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 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: cellular energy, healthy aging, brain and metabolic support — what the research shows, what's hype, and how the form you take matters.

Strength · 10 min read

Sermorelin Side Effects: What to Actually Expect

Sermorelin side effects, explained honestly by a physician — the common mild ones, the rare serious ones, how long they last, and when to call your doctor.