Why Does Vitamin C Serum Turn Orange? When It’s Still Safe to Use — and When to Throw It Away
Your Vitamin C serum was almost clear when you opened it. A few weeks later, it looks yellow. Then orange. Does that mean it has gone bad? Not necessarily. Vitamin C — especially pure L-ascorbic acid — is famously unstable. Light, heat and oxygen can slowly change it over time, and one of the easiest…