Replying to @kj5932 did you know your vitamin C can go bad? Vitamin C skincare tips from a dermatology physician #vitaminc #vitamincserum #serum #skincare #skincare101 #skincaretips #skincareproducts #skincaretiktok #skintok #skincarecheck #dermatologist #dermatology #fyp #skintokcommunity #insidertip