Tips for using Vitamin C and Retinol

Active ingredients for whitening and wrinkle improvement oxidize rapidly over time due to light and heat, causing their effectiveness to diminish.

You can tell just by looking at the contents turning yellow. That is why skincare companies invest heavily in developing heat- and light-blocking vacuum containers and stabilization technologies; however, the most effective method for the skin is still to use up fresh products before their expiration date. Additionally, regarding cleansers, using too little of milk, balm, or oil can cause irritation due to increased friction when rubbed into the skin. Conversely, cleansing foams, which contain concentrated cleansing ingredients and lather sufficiently, can dry out the skin by excessively removing sebum and moisture if used in excess, so it is important to use only the appropriate amount.