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Recent issues cover

Benefits4 min read

Peptides for Hair Growth: What Has Actually Been Tested

Copper peptides and biotinoyl tripeptide-1 are sold widely for hair loss. The supporting studies are mostly cells and animals. Here is what exists in humans, and how it compares with the two treatments that have decades of trial data.

Benefits4 min read

Peptides for Energy and Sleep: Claims Versus Trials

Better sleep and more energy are standard peptide selling points. No growth-hormone secretagogue has been tested with sleep laboratory measurement, and the one peptide with a large sleep trial works by a completely different route.

Benefits4 min read

Copper Peptides vs Retinoids: Comparing the Skin Evidence

Copper peptides and topical retinoids are both sold for photoaged skin. One has several small trials, the other decades of large ones. What each has actually demonstrated, and the head-to-head trial nobody has run.