Can coffee cover gray hair and is it good for your scalp? Know what science says

Coffee can temporarily tint gray hair due to its natural pigments, but the effect is mild and short-lived, unlike permanent dyes. While caffeine in topical products shows promise for promoting hair growth and scalp circulation by blocking DHT and increasing blood flow, excessive coffee application may lead to dryness. Allergic reactions are rare, but caution is advised with DIY treatments.