How to Use Retinol and Vitamin C in Your Skincare Routine: The Right and Wrong Way to Apply Them
Before you mix or layer these ingredients, read this.
Sodium Ascorbyl Phosphate
The Reason Vitamin C Serum Can Darken Your Skin (And How to Stop It from Happening)
Serum staining your face and fingers? Here's what to know.
This Is Why Your Skin Is So Dry (and What to Do About It)
Address these underlying causes, and you'll probably need less moisturizer.