Mechanical stimulation of the scalp in androgenetic alopecia: a narrative review of massage, tension, and mechanotransduction

Mechanical stimulation of the scalp, such as massage and tension devices, is a low-risk approach with a biologically credible mechanism for addressing androgenetic alopecia (AGA), but the clinical evidence supporting its efficacy is limited and immature. The review highlights that while the dermal papilla is responsive to mechanical forces, direct clinical evidence for manual massage is based on a small uncontrolled study of 9 men and a retrospective survey with 68.9% reporting stabilization or regrowth. The galea-tension hypothesis and circulation arguments are interesting but not strongly supported by causal evidence. Microneedling, which operates through a different mechanism, has stronger trial support. Motorized devices are plausible but lack specific efficacy trials. Overall, mechanical stimulation should be considered an adjunct rather than a primary therapy, and more robust, controlled trials are necessary to substantiate its effectiveness.