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The symptoms of vitamin B12 deficiency can be quite debilitating and include, according to scientific research: Chronic fatigue and weakness Shortness of breath Heart palpitations Tingling or numbness in the extremities Poor balance Loss of concentration and poor memory Disorientation Mood changes, including depression Insomnia Imagine trying to maintain a healthy, active lifestyle when you're constantly battling severe fatigue and low energy

Reconstitution: 3.0 mL per 30 mg vial (~10.0 mg/mL) for accurate unit measurements

Because all four share one vial, they are reconstituted and dosed together the components cannot be adjusted independently

Studies that found associations generally didnt adjust for kidney or liver function