It may help, but it will also throw off lab tests while you’re taking it and for a time after. Also, B12 absorption depends strongly on good gut health (ex. no SIBO[1], low gastric acid, pernicious anaemia, etc.), as well as on other medications (ex. metformin[2]) not interfering with absorption.
https://ashpublications.org/blood/article/114/22/1989/111148...