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In summary, both intramuscular and intravenous methods have their uses in B12 therapy
[1] For example, if a 2 mL dose (full 200 mg thiamine, 200 mg niacinamide) is to be given IV, a nurse might mix it into 50 mL of saline and infuse over 15-30 minutes
10.1093/oxfordjournals.bmb.a072259 33 EyreD
MOTS-c is typically administered via subcutaneous injection into the abdomen, lateral thigh, or flank, rotating injection sites to prevent tissue accumulation