Cosmetics expire like food! Here are the tips to keep the expiration date of cosmetic products.

The shelf life, or expiration date, of a cosmetic or personal care product is the period during which the manufacturer has determined a product to be best suited for use.

They're going to dry out, get clumpy and not apply as smoothly. That's true for everything from mascara to lipstick and foundation.

All of the molecules in these products can break down into something else, and you can have a reaction to it

Your expired makeup can also start to harbor bacteria. When it comes to your skin, this can mean irritation and bumps that look like acne. And when it comes to your eyes, this bacteria buildup can actually cause infections and pink eye

Six months for liquids; two years for powders