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The body's capacity to absorb B12 from food is naturally limited by intrinsic factor, a protein produced in the stomach that binds to B12 and facilitates its absorption in the small intestine

Thanks If my memory serves me well I believe you would need about 10mls of air direct into a vein to cause an air embolism so I wouldnt worry about a tiny amount re subcutaneous and IM

This means that when one or more drugs are taken, there is always a potential risk of interactions with the nutrient status

Ideal candidates typically include adults interested in proactive aging interventions who have realistic expectations about current evidence limitations