There is no such thing as over dosage in whitening supplements. Primarily Glutathione is given at a daily dose of more than 500mg to certain patients. GLUTATHIONE and its components are all supplements; they are in existence in our body. They are water-soluble which just means that if there’s anything in excess, it will be just excreted through urine or bile.
Some people with darker skin tone report that taking GLUTATHIONE along with vitamin C for three to six months or more actually lightens the color of their skin.