Does your body absorb it somehow? Does it help as a moisturizer?
In: Biology
Topical caffeine can’t really get into your bloodstream to the levels necessary to have the same effect as say… a caffeinated drink. But it can penetrate into the upper levels of your skin and cause minor vasoconstriction (reduced redness / dark circles) and a mild tightening effect, and so it’s popular in eye creams. But even if these claims are true, the effect would be purely temporary and short-lasting. Any claims about it improving your skin long-term are not currently supported by the evidence.
It’s more likely that including it in other products like shampoo is more akin to the “cold” sensation of minty toothpaste: i.e. it has no effect whatsoever on actual oral hygiene, but people have come to associate the cold feeling with how toothpaste “should” feel, and will reject toothpastes that don’t add it.
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