Tag: How to store vitamin c

According to dermatologists, a bottle of vitamin C serum typically lasts between 3 to 6 months after opening before it begins to oxidize and lose its potency. This guide explores how long does vitamin C last after opening, the factors that influence its degradation, and the best practices to maintain its effectiveness.

Vitamin C is a notoriously unstable active ingredient, with its efficacy diminishing upon exposure to air, light, and heat. Learning how to tell if vitamin C has oxidized is essential for ensuring your skincare product is still potent and providing the benefits you expect.