Ruruberry - Sushen review for Ethyl 5% Ascorbic Acid

This serum come with yellowish viscous texture. It dry fast and left tacky feeling. I need to wait the serum been fully absorb before apply moisturiser. It left matte finish when fully absorb. I would said it need to try and error to figure the perfect amount you need. For me is one pump. For brightening effect, you can see it does improve my acne redness. Remember to store at cool place and avoid direct sunlight to avoid oxidise and wear sunscreen.