What chemicals are in modern sunscreen sticks?

In modern sunscreen sticks you'll basically find two main categories of UV filters. There are chemical filters like octinoxate, avobenzone, or homosalate, which absorb UV radiation and convert it into heat. Then there are physical filters like titanium dioxide and zinc oxide, which basically act like tiny mirrors and reflect the radiation. A lot of manufacturers these days mix both types to get better protection.

Besides the UV filters, there are other ingredients you should know about. There are emulsifiers so the whole thing doesn't separate into oil and water, humectants like glycerin, and often antioxidants like vitamin E to protect your skin. Preservatives are obviously in there too, otherwise the stuff would go bad quickly. Some sticks also have fragrances or plant extracts in them, depends on the brand.

If you have sensitive skin or want to avoid certain ingredients, it's worth checking the list. Some people react to chemical filters with redness, for others it works perfectly. The physical versions tend to be a bit whiter on your skin, but usually they're more tolerable. I personally like going for the sticks with zinc oxide - they just sit better in the summer.