Hair on GLP-1
Three to four months in, the shower drain starts telling a story. Most of what's happening is reversible — and the timeline is predictable. This part covers the biology, the evidence-backed actives, and the line where topical care stops being enough.
Companion toRosemary Scalp Oil- 1.1Why am I losing hair on GLP-1?Why You're Losing Hair on GLP-1 — And Why It's Not What You ThinkThe biology of telogen effluvium, why semaglutide and tirzepatide push hair into its resting phase, and the 3–6 month timeline that explains what you're seeing in the shower drain.
- 1.2Which scalp ingredients actually have evidence?The Ingredients with Evidence: Rosemary, Peppermint, and What Else WorksThe 2015 Panahi rosemary-vs-minoxidil trial explained, peppermint's mechanism, the carrier-oil layer, and an honest read on what doesn't work.