Is it possible to overuse Alpecin Caffeine Liquid by applying more frequently (i.e after bathing in the morning or exercising at night)?

No, the amount of caffeine absorbed via the scalp and hair corresponds to approximately half a cup of coffee. This is absolutely safe even for people who react sensitively to caffeine. In addition, the active ingredient is applied locally to the scalp; the quantities that disseminate throughout the organism from there are negligible.