b12 2000 mg injection side effects diarrhea High-dose vitamin supplements can sometimes cause effects, including headache, nausea, vomiting, mild diarrhea, itching, skin rash, tiredness, weakness, or tingling in the hands and feet. OC: Best B-12 Injections for Weight
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How Long Are B12 Shots Good For Once Drawn Up

Have a slow metabolism and need help breaking down fat more efficiently

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Choline some additional links regarding the ingredient choline

Following a vegan or vegetarian diet, as B12 is mostly found in animal products