Theoretical concerns Copper accumulation: Each 2mg injection contributes about 0.03mg copper versus 0.9-2.2mg from daily diet
The participants were between the ages of 20-50 years old, did not have any chronic medical conditions, did not have any presence of acute illness, were within the normal BMI category (18.5-24.9 kg/m2), and did not use any drugs or dietary supplements on a frequent and/or mandatory basis
While many use glutathione for skin brightening, scientific evidence supporting oral supplementation for this purpose is limited
BMJ 305 : 14241429 Sachdev D, Li SL, Hartell JS, Fujita-Yamaguchi Y, Miller JS, Yee D (2003) A chimeric humanized single-chain antibody against the type I insulin-like growth factor (IGF) receptor renders breast cancer cells refractory to the mitogenic effects of IGF-I
Splitting into twice-daily injections is reasonable at higher daily totals (e.g., 250 mcg AM + 250 mcg PM at a 500 mcg/day total)