Hydration Serum Before or After Treatment Serum? The Correct Order Explained Most skincare routines fail not because of the wrong products—but because of the wrong order. One of the most common questions dermatologists, formulators, and skin professionals hear in the USA is: Should hydration serum be applied before or after treatment serums like niacinamide, vitamin C, … Continue reading Hydration Serum Before or After Treatment Serum? The Correct Order Explained