Vitamin b12 and vitamin d levels low?

Mental health
1

hi iv got to have b12 injections anyone had these? and any e effects please?
also my b12 level is 87
and vitamin D level is 19 i know mine are low as got to have injections but anyone if these are these really low or ok low
thank you

2

experts say that B12 levels are considered low when they are below 200 ng/ml.
doctors say vitamin D levels should be between 20 and 40 ng/ml . other experts recommend a level between 30 and 50 ng/ml.

3

thank you very much
muchly appreciated.