Well, blow me over, or give me a good roasting in the sun, because your body, and mine, can produce sunscreen.
https://www.theorganicprepper.com/your-body-can-produce-sunscreen/
https://www.nature.com/articles/s41467-020-15421-7
“According to a study published in April 2020 via the journal Nature Communications, genes present within the human body are capable of not only producing Vitamin D when the body is hit with sunlight, but the genes also have the potential to produce a natural sunscreen. You read that right: the human body is to a certain extent capable of producing its own sunscreen, thanks to some of the same genes that assist with Vitamin D production. But what about skin cancer? This find is in stark contrast to the old harping voice of the sunscreen industry, which maintains that sunlight can cause skin cancer and things of that nature. While it’s provable that the massive array of frequencies contained within sunlight contains ultra-high frequency radiation, things that are thought to cause skin cancer and the like. However, is it possible that back in the last several decades of the 20th century, when so many people were getting skin cancer and having holes cut out of their backs to treat it, that sunlight wasn’t the primary agitating factor? Nowadays, it certainly is less common to encounter young people with holes cut in their backs due to skin cancer. Personally, both my grandfathers had just that, holes cut in their backs due to skin cancer. However, one thing I know about their lives, is that they lived and breathed DDT and other carcinogenic chemicals which utterly drenched the common American household back in that day. Some believe that environmental carcinogens in household products, pesticides, herbicides, and the like had more to do with skin cancer back then than sunlight. Supplementation of Vitamin D is more difficult than some vitamins, with a proper balance to Vitamin A necessary, to really get its full benefits if consumed via a supplement. Cod liver oil is said to be a great Vitamin D supplement, because of its natural balance between Vitamin D and Vitamin A.