No universal dose: appropriate use depends on an individuals health profile and is determined by a licensed provider, not a standard number from the internet
How Often Do You Need a Vitamin B12 Injection
Endocrinology 142 : 51825189 Hollenga C et al
It is a well-characterized, mechanistically specific peptide with a 30-year research history, a strong clinical safety record from formal trials, and modest but real efficacy data from 12-week studies
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
