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RSV efficacy may depend on formulation, dose, or bioavailability (Malaguarnera et al
Reitman recommends baseline blood work to confirm deficiency and rule out other causes of fatigue
12 , e34 (2010)
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
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