Have you ever heard of caffeine-containing body wash and soap? I’d heard of using coffee grounds as a fat-reducing, exfoliating scrub before (spoiler: rubbing coffee on your body will not help you lose weight, it does exfoliate quite nicely though but also makes a mess in the tub). Anyway… Until last month I’d never heard of caffeine-containing body wash. Silly me, I should have known that it would exist.
Upon hearing about it, naturally, my first question was if we could even absorb caffeine topically. As it turns out, yes, we can. Of course, my next question was whether or not one could absorb enough caffeine from a body wash to have any appreciable effect. Short answer: probably not. The study in the previous link showed that about 50% of caffeine applied topically can be absorbed through hair follicles and caffeine shows-up in blood after only five minutes of topical application when follicles are open. A nice warm shower would ensure that your follicles are open for maximum absorption. However, I don’t know about you but I don’t really want to stand around for at least five minutes to get a little bit of caffeine from my soap. I’d hazard to guess that for the amount of time that most of us spend covered in soap suds that we’d absorb very little caffeine from our soap.
While caffeinated soaps and body washes may make a fun gimmicky gift for the caffeine aficionado in your life, if you really want to keep them awake you’re better off giving them some good old-fashioned coffee beans.