Those study doses should not be interpreted as a universal recommendation
Antioxidants (Basel, Switzerland) , 13 (3), 354
Their activation results in opioid-induced adverse gastrointestinal effects: increased sphincter tone, reduced secretions and increased water absorption, reduced gastric emptying, and reduced propulsion of chime through the intestine (34)
Many people who supplement with glutathione notice immediate benefits to mental clarity and how they feel, but it may take longer (weeks or months) to replete glutathione levels into the optimal range, especially when deficient
10.1371/journal.pone.0226927 PLoS One
Results persist but gradually return toward baseline without ongoing support