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These products are typically supplied in lyophilized (freeze-dried) powder form , with notable differences between sellers in terms of testing transparency, documentation, and overall quality signals
Feelings of nausea, a disrupted stomach, or diarrhea
Insider's takeaway The Institute of Medicine has not established a tolerable upper intake level of B12 because studies show no adverse health effects when taking excess levels of B12, either through food or supplements
This can include other supplements and vitamins
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