Does sunscreen ever expire?

KANSAS CITY, Missouri - Sunscreen will help protect you from those burning rays when the weather is this hot. But the question remains, when does your suncreen expire?

According to , sunscreens are designed to remain stable and at original strength for up to three years.

This means you can use leftover sunscreen from one year to the next.

There are some sunscreens that include an expiration date or indicate when the sunscreen is no longer effective.

Discard the sunscreen that's past the expiration date, is more than three years old or has been exposed to high temperatures.

Keep in mind if you use sunscreen frequently, a bottle of sunscreen shouldn't last from one year to the next.

A recommended application of sunscreen is 1 ounce (30 milliliters) — the amount in a shot glass — to cover all exposed parts of the body.

To maximize protection from the sun, use a broad-spectrum sunscreen with a sun protection factor (SPF) of at least 15.

The American Academy of Dermatology recommends using a sunscreen with an SPF of 30 or more.

Apply sunscreen 20 to 30 minutes before going outdoors and reapply about every two hours — or more often if you're swimming or sweating.

Make sure to rub the sunscreen in well.

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