I make my own Seasonal cosmetics. For summer I had to come up with a sunblock of course! I used Titanium Dioxide and Zinc Oxide as my active ingredients (in a coconut oil and shea-aloe butter base, it absorbs translucently like a champ). I am wondering how they mass extract/ manufacture these two ingredients, how they work, and are there any side effects of using them daily during the summer. I went to Costa Rica and tested the product out, it passed with flying colors. I am dark olive skinned and barely got a tan! My fiance is pale and prone to burning and he did not show signs of redness at all. We only applied in the morning and did not need to apply the rest of the day, although if we had been in the water and at the beach ALL day I know we would have re-applied.