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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

Within this period re-treat with a non-selenised Vitamin B12 supplement

B12 overdoses are unusual

The nutrients circumvent issues with oral administration including upset stomach, absorption issues, and loss of potency leading to quicker health results

Declaration of interest: K

Then switch to a 10mg vial for weeks 9 through 16, where weekly doses of 1mg and 1.7mg consume the vial much faster