3 grams -5 grams or so. Fang Fang whitening beverage is an oral whitening product, which contains a lot of whitening ingredients such as vitamin C. If 18-20-year-old people drink about 3 grams a day, if people over 25 drink about 5 grams a day, such persistence will have certain effects, too little is ineffective, and too much is not easy to absorb.