TLDR Metformin helps hair growth by affecting cell signals related to hair follicle development.
In 2019, a study was conducted to investigate the effects of metformin, an AMPK activator, on hair growth. The study found that metformin increased the cellular proliferation of human dermal papilla (DP) and outer root sheath (ORS) cells, which are crucial for hair growth. The study also found that metformin treatment significantly increased Ki-67 expression, a marker of cell proliferation, in the ex vivo hair follicle organ culture. Furthermore, metformin treatment led to a significant increase in AMPK phosphorylation, which suppressed β-catenin degradation and enhanced its nuclear accumulation, promoting hair growth. The study concluded that metformin promoted hair growth via the AMPK/β-catenin signaling pathway in vitro with DP and ORS cells, suggesting potential use of AMPK activators for the treatment of alopecia.View this study on kci.go.kr →