Commonly used in Japanese over-the-counter (OTC) medications as an acne-fighting ingredient. QUATERNIUM-73 possesses extremely strong antibacterial activity(disrupting bacterial and fungal cell membranes, with excellent effects against Propionibacterium acnes); it also inhibits melanin formation; it is highly effective yet extremely safe; and is frequently used in acne-fighting, whitening, and spot-removing products. Suitable for various skincare products, it is recommended for use in oil-controlling acne-fighting, anti-acne skincare products, and men’s skincare products.Even at low doses, it can inhibit bacterial growth or render bacteria unable to survive by breaking down microbial cell membranes and reducing intracellular activity, thus exhibiting broad-spectrum antibacterial activity. It effectively inhibits tyrosinase and melanin formation, achieving a whitening effect.