At the risk of sounding obvious, don’t use brown-colored skincare. So I haven’t always been so informed about skincare ingredients. Vitamin C is popping up in lots of products nowadays due to its ability to lighten up hyperpigmentation. Turns out that one sign of vitamin C becoming destabilized and losing its efficacy is a deep yellow/orange or light brown color.
I’ve used various products without even realizing that this had happened because the product was discolored from the start and because I didn’t even realize that vitamin C was an ingredient.