Research & Guides

The peptide library, written by clinicians.

62 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

GLP-1 and Muscle Loss: What the Evidence Actually Shows

Lean mass falls alongside fat on a GLP-1. What the body-composition studies measured, why the number is less alarming than the headlines, and what actually protects muscle.

Dr. Richard Dentico, MD · 8 min read

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Glutathione vial and syringe prepared for a physician-prescribed injection

Longevity · 9 min read

Glutathione Dosage: What the Research Used, by Route

The doses used in published research, broken out by route — and why the injectable number is a prescribing decision rather than a label instruction.

Lab report and blood test results laid out on a desk while reviewing biomarker data

Guides · 11 min read

Function Health Reviews: What It Does Well, and Where It Stops

What Function Health actually costs, what you get, where it genuinely wins on price, and the gap that shows up in most negative reviews.

Molecular chain illustration representing the amino-acid structure of GLP-1 peptide hormones

Guides · 8 min read

Is GLP-1 a Peptide? Yes — and the Distinction People Draw Is Wrong

GLP-1 is a peptide hormone, and the drugs built from it are peptides. The split you see advertised is regulatory, not chemical — here is what actually separates them.

Open notebook and laptop in morning light, illustrating an article on how to read NAD+ reviews critically

Longevity · 11 min read

NAD+ Reviews: What They Measure and What They Miss

NAD+ reviews contradict each other partly because they are not reviewing the same thing. Most describe an oral capsule; most readers are weighing an injection.

Compounded sermorelin vial on a clinical surface, illustrating an article reviewing patient-reported sermorelin results

Longevity · 12 min read

Sermorelin Reviews: What Patients Report and What Holds Up

Sermorelin reviews contradict each other because they come from three different populations asking three different questions. Here is how to tell which one you are reading.

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