I’ve been applying DIY 20% ascorbic acid solution on my face for a few weeks, and am seeing some benefits already. Photoaging and spots seem to revert a bit, and there is definitely some lightening (as expected [1]). According to some Reddit posts, it takes a few months until the improved collagen synthesis becomes noticeable. Vitamin C serums are quite expensive because ascorbic acid oxidizes quickly, and other form…
Interesting, though why would a person want to do this skin depigmentation? Is it like people dying their hair color?
In my case, I‘m just taking it as a sign that it’s working, as pigmentation is only one of the areas AA affects.