Hair
Inversion Method (Hanging Upside Down)
Blood flow is not the limiting factor in hair growth, and hanging your head down for four minutes does not durably change scalp perfusion anyway.
Also called: inversion method · upside down hair growth · head down hair
Verdict — cope
The mechanism does not hold. Your time is better spent elsewhere.
Evidence grade D
Nobody has demonstrated this works. Note that this grades the evidence, not the danger — read the verdict for that.
Mechanism
Claims gravity-driven increased scalp perfusion stimulates follicles. Follicular miniaturisation in pattern loss is driven by androgen receptor signalling, not by inadequate blood supply.
Citations
- Pathogenesis of androgenetic alopecia: androgen receptor signalling and follicular miniaturisationJournal of Investigative Dermatology Symposium Proceedings · 2005
The full read
The premise fails twice. Scalp perfusion is not what limits the follicle in androgenetic alopecia — if it were, a scalp massage would be a treatment — and the perfusion change from a few minutes inverted reverses the moment you sit up. The reported 'inch a month' results come from measuring hair that was there already and from a growth rate (roughly 1–1.5 cm a month) that was happening regardless. Contraindicated with high blood pressure, glaucoma or reflux. This one is a clean example of a plausible-sounding mechanism that does not survive being asked what the actual bottleneck is.
