The most advisable dosage is 10-20mg/kg BodyWeight. To use glutathione as an anti-oxidant and for whitening it has to be 20-40mg/kg/BW. Example: 50kg x 20mg = 1000mg. You have to take it with Vitamin C in ascorbic acid form to be able to maximize its whitening effect.
It is 100 percent proven that it really works to whiten skin. For most people, the first 3 months use of gluta is crucial for it is the time where gluta is building the foundation (body chemistry re-alignment) and once built this is only the start for its whitening process. The lightening of skin is gradual (speed is depending on your metabolism and body chemical functioning) this is where you will notice that your skin is shinier and healthier than before. After this process, you will notice that your shade is lighter than before. Glutha whitens the skin by reducing the melanin formation of the epidermis going up to the dermis