In a double-blind, placebo-controlled study published in Diabetes Care (2005;28[10]:2458–2464), researchers evaluated the effects of micronutrient supplementation on kidney function in patients with type 2 diabetes.
Sixty-nine participants were divided into four groups and followed for three months. One group received 200 mg of magnesium and 30 mg of zinc daily. A second group received 200 mg of vitamin C and 100 IU of vitamin E daily. A third group received both the vitamin and mineral combinations, and a fourth group received a placebo. Kidney function was assessed at baseline and at the end of the study using two markers: urinary albumin excretion (a marker of glomerular function) and urinary N-acetyl-β-D-glucosaminidase (NAG), a marker of tubular function.
After three months, urinary albumin excretion decreased in both the group receiving vitamins C and E and the group receiving the combined vitamin–mineral supplementation. NAG levels did not change significantly in any group. The authors concluded that supplementation with vitamins C and E—alone or in combination with magnesium and zinc—improved glomerular, but not tubular, renal function in patients with type 2 diabetes. In addition, the group receiving both vitamins and minerals experienced higher HDL (“good”) cholesterol levels and lower fasting blood glucose.
Type 2 diabetes is associated with increased oxidative stress and impaired micronutrient status, both of which may contribute to vascular and kidney damage. Vitamin C and vitamin E are known to help reduce oxidative stress, while magnesium and zinc play important roles in insulin signaling, glucose metabolism, and lipid regulation. Low magnesium and zinc levels are common in people with type 2 diabetes and have been linked to poorer glycemic control. Several clinical trials and reviews suggest that restoring these nutrients—particularly in combination—may modestly improve metabolic markers and early indicators of kidney stress. These findings support the view that micronutrients help address underlying deficiencies and metabolic strain, rather than acting as stand-alone treatments for diabetic complications.
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References:
- Diabetes Care. 2005;28(10):2458–2464. Effects of vitamin C, vitamin E, magnesium, and zinc supplementation on renal function in type 2 diabetes.
- Nutrients. 2017;9(8):824. Oxidative stress and antioxidant status in diabetes and diabetic complications.
