1ď¸âŁLOTION P50 "150ml $680" Highest concentration, suitable for combination skin, oily skin, and acne-prone skin. For skin with excessive sebum production that is not allergic, use this one; 2ď¸âŁLOTION P50W "150ml $680" Weakest concentration, suitable for sensitive skin or first-time users; regardless of skin type, if the skin is sensitive, use this one; 3ď¸âŁLOTION P5OV "150ml $680" Contains walnut extract, more moisturizing, stronger antioxidant properties, suitable for dry acne-prone skin, suitable for ages 35+; 4ď¸âŁLOTION P50pigm400 "150ml $790" Contains spiraea extract and algae ingredients, helps even out skin tone, brightens and whitens skin, suitable for those without melanin issues or acne, can also use this one; Usage instructions: During initial use, first week, dilute P50 with a cotton pad and purified water (do not shake)