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.

[1] https://en.wikipedia.org/wiki/Small_intestinal_bacterial_ove...

[2] https://en.wikipedia.org/wiki/Metformin CTRL-F "B12"

Genetics will play a huge role in B12 absorption. Transcobalamin to be specific.

https://ashpublications.org/blood/article/114/22/1989/111148...