beauty hacks with historical backing

ive been interested in self-improvement, especially the beauty side of it since I was young. but the older I get, the more I realize that a lot of the products we're sold are profited in a way that makes whatever you're trying to care for worse, just so you can buy more of their products.

im wondering if anyone has any ancient beauty tips they can give, even basic ones that are backed by proper research through the years and not drenched in marketing and lies. I avoid chemists now and just go to health shops because of this