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Critically, both subjects and investigators were blinded to the group assignment, ensuring impartiality throughout the study

"Vitamin C." National Institutes of Health: Office of Dietary Supplements

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While oral glutathione is generally considered to be safe, there is not enough data to recommend long-term use, especially for women who are pregnant or breastfeeding, people who take prescription or over-the-counter drugs, and those who have chronic conditions, says Malhotra

A total of 40 participants were selected and randomized into two sequences in a double-blind, placebo-controlled crossover design, with a one-week washout period between treatments to eliminate carryover effects