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Clinical evidence shows that glutathione inhibits the tyrosinase enzyme that produces melanin, but oral absorption is extremely poor, with bioavailability of only 10-20%
Additionally, research indicated that there may be a reduction in the expression of urea cycle enzymes, a possible re-establishment of nitrogen balance, and a potential modification or enhancement of nitrogen levels in different tissues
About 20% of users report flushing
Meat, broccoli, tomatoes, spinach, and other foods contain the (R)-(+)-enantiomer of ALA [132,133,134]
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