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      learn Vitamin D

      Vitamin made in the skin from sunlight, also taken as a supplement

      learn Follistatin

      Protein that blocks activin, a growth-regulating signal

      learn Caffeine

      • Does caffeine stimulate hair growth or only slow hair loss? Caffeine stimulates hair follicles in laboratory cultures, and one open-label, manufacturer-funded trial in 210 men found a 0.2% caffeine topical non-inferior to minoxidil 5% on an anagen-ratio endpoint. A 2025 systematic review found only a few small controlled trials, mostly rated low or very low quality, and none in alopecia areata.

      learn Peppermint

      herb and oil thought to stimulate skin and hair

      learn Dexpanthenol

      Provitamin B5, a moisturiser in hair and skin products