doi: 10.1159/000546764 211 LiuYLuWXiangZShenYNiBZouHet al
[6] Omar Hoftun, "Ephedra sinica seeds, by Omar Hoftun," Wikimedia Commons
The publication concluded that Supplementation with a combination of vitamin D and L-cysteine or glutathione precursor, rather than supplementation with vitamin D alone, is beneficial and helps achieve more successful vitamin D supplementation. Study Confirms Significant Effect of Vitamin D Level on Levels of Glutathione, GSSG, and Cysteine A study by Alvarez et al
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