The most common dosage in the (limited) body of research is 1.33 and 0.81 mmol/kg/day (millimoles per kilogram of bodyweight per day) of glycine and cysteine (in the form of N-acetylcysteine, which is about 74% cysteine), respectively. This dosage is equivalent to about 100 and 133 mg per kilogram of body weight per day (mg/kg/day) of glycine and N-acetylcysteine, respectively.