does b12 injection have side effects How Quickly Shot Work? Does It Help to Lose Weight? Does the Vitamin B12 Shot
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B12 is water-soluble, so your body will excrete what it doesn't need

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Methods (2001) 25(4):4028

It is also added to fortified foods, such as breakfast cereals, to help support proper nutrition

Consumers were advised not to use the products and seek a full refund