Mineral sunscreens, like those offered by My Day Screen,  contain zinc oxide and titanium dioxide as active ingredients.These are the only two active ingredients that the FDA has deemed to be Generally Recognized As Safe and Effective (GRASE) for use in sunscreens. Mineral sunscreens protect by reflecting the light.Chemical sunscreens, like those with Oxybenzone, Avobenzone, Octisalate, Octocrylene, Homosalate, and Octinoxate as active ingredients, actually absorb into the skin to work. The FDA conducted a recent study and found that six of the most common chemical active ingredients tested were absorbed into the body. Some continued to be elevated beyond the FDA’s threshold of concern for three weeks after the subjects in the study stopped using the sunscreen. This study is referenced in the following article: https://www.webmd.com/skin-problems-and-treatments/news/20200121/fda-skin-absorbs-dangerous-sunscreen-chemicals.