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Severe gastrointestinal disease or gastroparesis
Vitamin B12 injections can be a useful supplementation method for vegans and vegetarians who might struggle to maintain healthy vitamin B12 levels through diet alone
doi:10.1002/1099-0690(200301)2003:1 3.0.CO;2-I
An intramuscular injection, which goes deep into the muscle, allows for very rapid absorption and is great for quickly addressing low B12 levels
Because this formula contains niacinamide, a few people might experience a flushing reaction (warmth, redness of the skin) or slight itching, although niacinamide usually does not cause the intense skin flush that niacin (nicotinic acid) does
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