I did find one topical caffeine product, though, which has scientifically-proven data to back up its claims: caffeine shampoo can induce a small increase in hair growth, per an article in the British Journal of Dermatology. So Alpecin Shampoo, which contains 5000mg of caffeine in its tiny 250mL (approx 8-fl. oz) bottles, can blast your hair follicles with an enormous dose of caffeine without very much of it entering your bloodstream. The average cup of coffee contains 100-150mg of caffeine, which means that if a significant amount of it DID enter your bloodstream through your scalp, you’d suffer an acute caffeine overdose from using Alpecin.
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