The enzyme glutathione reductase regenerates GSH from GSSG, keeping the antioxidant pool replenished
Although some studies have demonstrated benefits such as increased lean body mass and improved body composition (in populations with clinical need for the drugs), these gains have not consistently translated into enhancements in muscle strength, physical performance, or overall quality of life
A 2019 study found that older adults supplementing high doses of vitamin B12 were at an increased risk of colon cancer
Possible Side Effects Observed in Research & Experimental Settings Glutathione has been explored in laboratory and experimental research settings, and observations in some research contexts have included: Administration-site irritation Temporary redness or discomfort Headache-related observations Nausea-related observations Fatigue- or lethargy-related observations Dizziness-related observations Gastrointestinal-discomfortrelated observations Temporary flushing or warmth-related sensations Responses may vary depending on experimental conditions, research amount, administration frequency, and experimental protocol design
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References Lopaschuk GD, Karwi QG, Tian R, Wende AR, Abel ED