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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
Nature 388 , 839840 (1997)
Wu T, Zhao Y, Zhang X, et al
2 mg vial reconstituted with 1 ml BAC water = 0.02 mg per unit
This is likely as the fewer ingredients are better for more sensitive and irritation-prone skin, as there is less to avoid
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