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Vitamin B12 supports several important functions in the body, including: DNA synthesis Red blood cell production Nervous system function Myelin production, which helps protect nerves Energy metabolism Vitamin B12 absorption becomes more difficult with age because the body may produce less intrinsic factor, a stomach protein required for proper absorption

The Myth of B12 as a Performance Enhancer The Mayo Clinic weighs in definitively on this topic: Some researchers have studied vitamin B-12 to find out if it can raise energy and endurance during exercise

Trends Endocrinol Metab 21:610618

Chronic Disease Chronic diseases may promote the development of RLS, or worsen its symptoms

Electrolyte Imbalance Low levels of magnesium, potassium, calcium, or sodium disrupt the electrochemical signals that tell muscles to contract and then relax