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Unless the argument is that those people can access their B12 stores and you cannot, but I don't think we can assume that

The three recommended injection sites are the abdomen (at least 2 inches from the navel), the front of the thigh, and the back of the upper arm

" "For those with normal absorption capacity, meaning being under age 50 with an intact gastrointestinal system and without diseases like pernicious anemia, we normally lose about one microgram of vitamin B12 a day

Energy tends to respond first, mood and focus follow within a week or so, and the longer-term, structural benefits build quietly over months

ISBN 9782080125163