Almost anyone will tell you what to take. Far fewer will tell you what to skip.

This guide grades 139 compounds across nine categories against the clinical literature - Strong where the human evidence is consistent and replicated, Moderate where it is real but qualified, Emerging where the direction is promising and the trials are not there yet, and Overhyped where the marketing substantially exceeds what the research supports. Thirty-three entries earned the top grade. Ten compounds earned the bottom one, and they are in here too.

Every entry gets a full page: what it actually does, the evidence tier, the optimal form, the dose, bioavailability, purity red flags, what to stack it with, what to avoid it with, and the food-first alternative where one exists.

Written by Daniel Edlund, a Le Cordon Bleu-trained private chef, licensed strength coach and personal trainer with thirty years of strength training behind him. Not a doctor, and the book says so plainly - a practitioner who read the research and shows the reasoning, including for the entries he could not recommend.

A rating scale that never returns a negative result is not a rating scale. It is a catalogue.