the most powerful antioxidant is melatonin not glutathione and multiple sclerosis: antioxidant, anti-inflammatory and immunomodulator mechanism of action | Inflammopharmacology Melatonin 100mg for Antioxidant &

It depends on formulation and protocol

Cysteinylglycine or -glutamylcysteine have been proposed as possible alternatives.In a trial of adolescents with poorly controlled type 1 diabetes, a dose of 30-45mg/kg/day NAC failed to correct several markers of glutathione status, suggesting either a higher dose or alternative therapies may be indicated in this population.A recent study of patients with poorly controlled type 2 diabetes found that dietary supplementation of the amino acids cysteine and glycine, markers of glutathione synthesis and plasma oxidative stress were both improved

Found naturally in every cell, glutathione helps neutralize free radicals, combat oxidative stress, and maintain overall vitality

Here are some widely used options