Spontaneous cramps in the calf, foot, upper thighs, low back or hands can be a symptom of hypoglycemia. Following a sugar-free, high protein diet with frequent small meals often results in alleviation of this kind of cramping. Muscle cramps are also associated with an imbalance in the electrolyte minerals. Supplementing with calcium, magnesium and vitamin D helps to restore this electrolyte balance. Sometimes only magnesium and vitamin D are required.
Example of muscle cramp relief formula: https://vitamost.club/shop/calmax-osteo-nutrition-vitalized/