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In fact, one study found that peoples bodies absorbed about 49% of a 1-mcg dose of cyanocobalamin, compared to 44% of the same dose of methylcobalamin ( Conversely, another study comparing the two forms reported that about three times as much cyanocobalamin was excreted through urine, indicating that methylcobalamin may be retained better within your body ( However, some research suggests that differences in bioavailability between the two forms may be insignificant and that absorption could be influenced by factors such as age and genetics ( Unfortunately, recent research directly comparing these two forms of vitamin B12 is limited

[1] In cultured mouse adipocytes, exposure to a methylquinolinium NNMT inhibitor raised intracellular NAD+ and SAM and lowered lipogenesis

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However, the interactions have not been studied

Then reinsert the needle and syringe an inch or so away from where it was before

Advertisement The site of injection will vary, depending on whether you're giving a simple subcutaneous injection or an intramuscular injection