Here's How Often You Should Use Sunscreen, According To Science — PHOTOS

I think we can all agree that the most fundamental beauty rule for healthy skin is to use sunscreen. It will protect against skin cancer, aging, and damage to the skin from the UV rays, so naturally, you want to slather it on. But what you may not be sure of is how often you should use sunscreen? Everyone is going to have their own opinion, so it's probably better to go directly to the experts and find out what's best for your skin, according to science.

Whatever your friends/mom/or the sunscreen bottle says, if you are going to be outside, you need sunscreen. So if you're outside every day, then you need sunscreen every day. Even if it's cloudy. Even if it's raining. Unless it's pitch black dark out — say it with me — you need sunscreen. But how often do you have to reapply it? I mean, that isn't always easy once you've put your makeup on and stuff. Is it a one-time application and you're good to go kind of thing?

According to the American Academy of Dermatology, you need to apply sunscreen 15 minutes before going outside, and reapply it every two hours. However, if you swim or sweat, you'll need to reapply it after that.

Now that you know what to do, shop these products to help protect your skin. (And apply them every two hours!).

1. La Roche Posay

La Roche Posay Sunscreen; $29.99; amazon.com

This sunscreen is Paraben and fragrance-free, so you don't have to worry about irritation.

2. Neutrogena

Neutrogena Face Sunscreen; $10.49; amazon.com

It's oil-free, so if you're prone to breakouts, choose one like this.

3. Kiss My Face

Natural Sunscreen; $6.64; amazon.com

If you prefer all-natural products, this sunscreen is for you.

4. Radha Beauty

Face Moisturizer With SPF 30; $11.95; amazon.com

It's a moisturizer and a sunscreen all in one.

5. Andre Lorent

Daily Rehydrating Sunscreen; $24.95; amazon.com

If your skin is feeling dry, this sunscreen will help rehydrate it.

6. CeraVe

SPF 50; $12.74; amazon.com

The higher the SPF, the more protection.

7. Sun Bum

Face Stick; $9.93; amazon.com

If you're not into lotions, try a face stick.

8. Supergoop! Defense Refresh Setting Mist SPF 50

If you're worried about ruining your makeup when reapplying, use this setting mist, equipped with SPF 50.

Supergoop! Defense Refresh Setting Mist SPF 50, $28, sephora.com

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Image: Isla Murray/Bustle