I would not wait either
Signs of Vitamin B12 Deficiency Some common signs that you may be deficient in Vitamin B12 include fatigue or tiredness, weakness, difficulty concentrating or thinking clearly, pale skin, dizziness or light-headedness, loss of appetite, weight loss, constipation or diarrhea, numbness or tingling in the hands and feet, sore tongue, headaches and vision problems
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Hypoglycemia: risk increased when co-administered with insulin or sulfonylureas
As vitamin B12 is especially found in animal protein, this method can be helpful for vegetarians, vegans, and others who have little or no natural source of the vitamin