Generally—depending on what kinds it is—make-up is made to last somewhere between one month to two years. ... Preservatives in all make-up break down over time, so even a powdered eyeshadow palette isn't recommended for use past the three-year mark.

When should you throw away eyeshadow?

As a guideline: Foundation, primer, blush and eyeshadow may last up to 2 years. Lipstick should last for one year after it is opened. Eye makeup such as mascara and eyeliner would need to be replaced every three months.

What happens if you use expired eyeshadow?

When cosmetics get older, they won't just break down and get clumpy; eye makeup will also start to harbor bacteria, especially when they're improperly stored. When you use expired mascaras, eye shadows, or eyeliners, the bacteria can come in contact with your eyes, causing irritation and even serious infections.