Did you know that mixing certain skincare ingredients can actually do more harm than good? Niacinamide, retinol, glycolic acid, and vitamin C should not be mixed with certain other ingredients to avoid skin irritation and reduced effectiveness. Keep your skin healthy and glowing by using these ingredients separately, or at different times of the day. #skincare#beauty#niacinamide#retinol#glycolicacid#vitaminc#skincaretips