Features [Triple Collagen Action for Firm Skin] Serum that provides firmness and elasticity, leading to tightened skin. Product Description This serum, compatible with iontophoresis, contains low-molecular-weight collagen. In addition to collagen, five carefully selected types of hyaluronic acid retain moisture, leading to firm, elastic, and tightened skin. When using with iontophoresis, introduce with the negative (-) setting. It can also be applied directly to the skin as a serum. How to Use When using with aesthetic equipment: Apply to the face with a cotton pad or gauze. When using as a serum: After preparing the skin with lotion, take an appropriate amount and blend it into the entire face.