Research
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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.
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.
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.
"FDA-approved" and "works" are different questions, and conflating them is how most peptide confusion starts. This explains the two independent axes — regulatory status and evidence level — with four worked examples.
Fake and counterfeit versions of semaglutide and tirzepatide are being sold online, sometimes with made-up pharmacy labels. Here is how the FDA says to recognize them and buy safely.
Compounded semaglutide is not the same as Ozempic or Wegovy. It is not FDA-checked, the shortage that made it common is over, and the FDA has linked it to dosing errors and hospital visits. Here is the plain version.
Growth-hormone peptides are sold almost entirely on muscle claims. No controlled trial has measured muscle with them. The one peptide with positive lean-mass data is the one nobody markets for it.
Appetite changes in weeks, weight declines for over a year before plateauing, and cardiovascular benefit separates over months. Here is when each GLP-1 benefit appeared in the trials that measured it.
Whether a peptide is worth it depends on four things: what benefit is proven, in whom, for how long, and whether the effect lasts after you stop. Here is that framework applied to every peptide we cover.
Two peptides produce large, well-documented weight loss in randomised trials. Several others are marketed for fat loss with no outcome data at all. Here are the numbers, the timeframes, and what happens when you stop.
