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To maintain its effectiveness, B12 needs to be kept in a cool, dry place, far away from direct sunlight
For people who cannot tolerate GI side effects or who have medical conditions that make GLP-1 agonists risky, this safety differential is not a minor footnote
One study found that high doses of oral B12 (1,000 mcg daily) could provide adequate absorption even in the presence of intrinsic factor deficiency
Critical Functions of B12 in the Body Vitamin B12 helps make red blood cells, supports the nervous system, and is needed for DNA
You can read more about the safety profile in the AOD 9604 side effects article
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