According to Sugai, vitamin C “helps reduce dark spots and hyperpigmentation on the face." In simpler terms, it’s a brightening serum. However, you’ll want to pay close attention to vitamin C serums ...
Optionally, you can add a few drops of vitamin E oil for added nourishment. Store the serum in a dark glass bottle to prevent degradation from light exposure. Apply a few drops to cleansed skin every ...