Mary one last clarification – basically there are 2 types of sunscreen: Chemical and Physical (aka Mineral). All sunscreens fall into one of those two categories, and occasionally sunscreens contain both chemical AND physical ingredients.
Physical (aka Mineral) sunscreen contains the minerals zinc oxide and titanium dioxide. When you apply this type of sunscreen, it forms a physical barrier that blocks the sun’s rays from getting to your skin. These physical sunscreens are reef safe because they don’t contain the harmful chemicals that are in chemical sunscreens. The thing a lot of people don’t like is the way these physical (mineral) sunscreens leave a white cast immediately after you apply it, but there are a lot of brands making some amazingly thin and light physical sunscreens. And the white cast (which fades eventually) is there because it’s literally a layer of protection that will prevent the sun from penetrating your skin.
Chemical sunscreens *absorb* the sun’s damaging rays before the damage can penetrate your skin further. Chemical sunscreens contain ingredients like avobenzone, octinoxate, oxybenzone, benzophenone-3, and several other [potentially] harmful chemicals that can damage our ocean’s reefs and fish, ocean mammals, etc etc etc. Some people have irritation and sensitivity to chemical sunscreens due to their (probable) harmful ingredients, which is why dermatologists always suggest physical sunscreens for those who have sensitive skin.
Ideally, people who spend time in the ocean use physical (mineral) sunscreen, since it does not contain the dangerous, harmful ingredients that chemical sunscreens contain.
Personally I use both types of sunscreen daily as I live my normal life and go to work, etc., but if I were to go in the ocean I would only use physical sunscreen 100% of the time.
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