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Most evidence comes from laboratory and animal studies rather than controlled human trials, which means benefits remain investigational
Every unopened vial comes with a printed expiration date from the manufacturer
It occurs naturally in your blood plasma, and your body produces less of it as you age, dropping from roughly 200 ng/mL at age 20 to about 80 ng/mL by age 60
& Uyeda, K
Because it directly delivers glutathione into the bloodstream for faster results
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