Should I use a separate antioxidant under my sunscreen or just use a sunscreen with antioxidants?

I love that you asked this. In my opinion, this is a marketing ploy on the part of large manufacturers. It’s a little like my the zinc issue. My patients come in and say, “I found this great sunscreen at the pharmacy, and it has zinc in it!” Sure enough, it HAS zinc in it but only 1-2% which is virtually useless. If you look at the back of the tube or bottle, it tells you the active ingredients and their percentage. For zinc you want 8-20% depending on where you live (like Florida versus Seattle :)), how much you are outside, in a car, sweating, what time of day you’re outside, etc.
The antioxidant issue is really similar. Some large manufacturers are putting an antioxidant in their sunscreen products, but it’s so little, or not active that it’s useless. Notice how they don’t mention a percentage, and if you contact the company, they generally won’t tell you.
You’ll get a much better result over time if you use a high-quality one. Antioxidants are one area where it’s worth it to spen..

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