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Caffeine is a natural alkaloid found in coffee, cocoa, tea, cola, guarana and mate plants and beverages obtained from them. Coffee and tea are the most commonly consumed drinks which makes caffeine the most used toning and stimulating substance in the world. Caffeine’s stimulating effect is not limited to oral consumption, it also effects the scalp when applied locally: in that case, caffeine is absorbed through the scalp, stimulates blood flow, and favors hair bulb oxygenation. Well-oxygenated hair bulbs stay healthy and prevent aging and eventual hair loss.