how often b12 injections frequency Can I Take Injections? How Often Should You Get
Description
This is great if you want quick relief from the symptoms of B12 deficiency, like chronic tiredness and weakness

It clearly states in the guidelines not to retest

Andersson L

Interestingly, a recent study in Danish population showed that lower serum vitamin B12 concentrations were significantly associated higher BMI, but a genetic risk score related to vitamin B12 concentrations associated variants was not associated with BMI
