If more hair is showing up in the shower drain or on your brush, you might already be typing peptides for hair loss into a search bar. That's a natural reaction. But the first question isn't which product to buy. It's why your hair is shedding.
Before you try a peptide for hair loss, find out what type of shedding you have. Here is how the hair cycle, the common causes, and the evidence fit together.
Why the Order of Questions Matters
Hair loss isn't one condition. Gradual thinning at the crown, a diffuse shed a few months after a fever, and round patches from an autoimmune process can all look like more hair in the drain. Each one calls for a different response, so diagnosis comes before any product. If you want to understand how common pattern hair loss is, search PubMed for androgenetic alopecia prevalence review and read the population and methods of each paper before trusting a figure. This post doesn't quote a percentage, because the answer depends on who was studied and how.
Track your labs and see how your protocol moves your biomarkers.
Track it in the appHow a Hair Follicle Cycles
Each follicle moves through three main phases. Anagen is the active growth stage. Catagen is a brief transition, when growth stops and the follicle shrinks. Telogen is the resting phase, when the hair is eventually released and a new one begins to form in the same follicle. Losing some hair every day is part of this normal process. For the difference between normal and pathological shedding, the hair loss section of the American Academy of Dermatology is the place to check. Dermatology guidance focuses less on a single daily count and more on whether shedding increases, persists, or follows a recognizable pattern.
The cycle is also slow. A trigger that happens this month may only become visible on the scalp later, so judging any change, for better or worse, takes patience. That lag is also why one bad week in the shower drain tells you very little on its own.
