vitamin b12 injection given im or sq

https://www.evexiasdenver.com/wp-content/uploads/2020/02/Figure-1-People-most-at-risk-of-B12-deficiency.png Size:3ml Rat research found 38.4% oral bioavailability, but no human study has compared the two routes water for injection Reduced calorie diet combined with NNMT inhibition establishes a distinct microbiome in DIO mice | Scientific Reports

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