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McCarty, J

For example, this promotes fibrogenesis in the liver worsening the course of underlying hepatic disorders, and a similar worsening effect is observed on the course of other chronic disorders apparently not directly linked to iron homeostasis such as metabolic and cardiovascular disorders (Pietrangelo, 2016)

As the publication concluded, 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. How Supplementing with L-cysteine can Improve Vitamin D Status and Activity Glutathione is made of 3 different amino acids: cysteine, glycine, and glutamic acid