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Before making any changes in diet or supplements, be sure to consult with your health professional.
Cramps, numbness and pain in the feet are common when diabetes is not well controlled. Chronic high blood sugar levels can cause nerve damage in the feet which is called diabetic neuropathy. Vitamins B6, B12 and Biotin are helpful in preventing this problem, so if you are diabetic, it's a good idea to take a high potency B vitamin supplement. Here's more information about nutritional supplements for diabetics.
http://www.diabetes-guide.org/nutritional-supplements.htmIn addition, cramps in the feet are sometimes caused by low blood calcium levels. If you decide to take a calcium supplement to help reduce foot cramps, try calcium citrate, which is a much more absorbable form than calcium carbonate (which is cheap and common in many supplements). In addition you might want to get a supplement that includes magnesium as well as a natural form of vitamin D.