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Vitamin B12s benefits for the brain are many: It helps make myelin, speeding up nerve signals

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When we don't get enough iron, we may experience: Reduced capacity to exercise and skeletal muscle atrophy, even before iron deficiency anemia (IDA) develops Over time, IDA, resulting in abnormal red blood cell formation and symptoms such as fatigue, weakness, difficulty concentrating, impaired cognitive and immune function, and poor body temperature regulation IDA has also been linked to impaired glucose metabolism---potentially due to poor conversion of proinsulin to active insulin in the body

This is another check to make sure the supplements actually contain what the company says and that theyre really following the FDAs guidelines for creating high quality supplements