How to Tell if Your Vitamin C Serum Has Gone Bad
Vitamin C is a powerhouse antioxidant that guards the skin against free radical damage. However, one unfortunate downside of vitamin C serum is that it's unstable, which can cause it to degrade, oxidize, and lose its efficacy over time. So, how can you tell if your vitamin C serum has gone bad? Experts say a major red flag is if the color has changed since you first bought it. You should also take note of texture or scent changes, as it can also signal that it's time to swap it out for a fresh one. Bonus tip: If you want to prevent your vitamin C serum from going bad, store your product in a cool, dark location, and pay attention to its expiration period.