I alternate between sunscreen and foundation. One day, I let my skin rest by applying a light sunscreen, and the next, I protect it with foundation. Even with a light application, the previous day's foundation successfully regulated the skin's oil-moisture balance, neutralizing negative ions. This allows the skin to block UV rays and harmful factors, backed by strengthened immunity. It means your natural immunity has been reinforced. It's amazing. By implementing this good plan of alternating daily and switching to sunscreen every two to three days, I witness my skin's self-regenerating power. It is exciting and fun every time I see my skin becoming healthy and independent on its own. You should experience it too. Enjoy this repetitive process of allowing your skin to breathe and protecting it.