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Nat Rev Dis Prim
Current availability is confined to the research-chemical market, without regulatory oversight or established human safety data
Theyre also helpful for people who dont get enough B12 from their diet (spoiler: often vegetarians and vegans) and for people whose guts cant break down and absorb the vitamin
FDA.gov (2026) 11
For a subcutaneous B12 injection, a finer, shorter needle is used: around 25 to 27 gauge and half to five-eighths of an inch
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