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They test four key characteristics associated with quality and safety
An injection addresses one nutrient
Unlike others, the absorption of vitamin B12 depends on a protein called intrinsic factor, which is produced in the stomach
Many contain undisclosed binders, heavy metal chelators, or stimulants that can interact unpredictably
10.1111/j.1439-0434.2004.00884.x 86 LamoureuxG
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