Glutathione deficiency alters the vitamin D metabolizing enzymes CYP27B1 and CYP24A1 in human renal proximal tubule epithelial cells and kidney of HFD fed mice ScienceDirect POWER PAIR GLUTATHIONE & VITAMIN D An important connection Studies have shown that adequate levels of glutathione are important for the bioavailability of vitamin D absorption. Meaning, if you don't The Impact of Vitamin D and L Cysteine Co Supplementation on Upregulating Glutathione and Vitamin D Metabolizing Genes and in the Treatment of Circulating 25 Hydroxy Vitamin D Deficiency The protective effects of Vitamin D against Cadmium induced nephrotoxicity ScienceDirect Vitamin D Supplementation Modulates Blood and Tissue Zinc, Liver Glutathione and Blood Biochemical Parameters in Diabetic Rats on a Zinc Deficient Diet Biological Trace Element Research Springer Nature Link