When To Chuck Sunblock:
I HAVE AN OLD TUBE OF SUNSCREEN. IS IT STILL SAFE TO USE?
SKIN SHORT: Toss it if it looks or smells funky, or if it’s been more than 18-24 months since its manufacture date.
MORE SKINFO: Many companies can guarantee stability and efficacy for two years. Others guarantee longer or shorter. A lot depends on what actives are used.
Sunscreen actives need to be handled carefully: they are notoriously unstable with sun exposure and need to be stabilized by other ingredients. This is why you need to know the quality of the company making your sunscreen. The formulation’s other ingredients also matter. More fragrances and preservatives may make a product last longer but might cause other problems.