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In addition, poor mood and concentration, irritability, depressive symptoms, inability to sleep normally, nausea, vomiting, diarrhea, and even numbness and tingling in your hands and feet can be signs of a Vitamin B12 deficiency
2-4 Weeks Post-Injection Long-term benefits become more apparent
Methylcobalamin and adenosylcobalamin are already in active forms, which some practitioners prefer for people with genetic variations that affect B12 metabolism
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