Eczema-like irritation prompted hair to grow back on shaved mice over 20 days (bottom row), compared with much less visible growth on shaved mice without this irritation (top row)
Tai et al. 2025
Skin irritation promotes hair growth on mice by stimulating their fat cells – and a serum could bring about the same effects in people, without needing to cause discomfort.
Hair loss can sometimes be treated via medications or steroid injections, but more effective therapies are being developed, such as the use of stem cells or drugs that wake up dormant hair follicles.
