I am not sure if your B supplement is a good one or not. But, what I did want to mention is that if you have candida, that means you have gut issues, which means you won't be able to digest properly. So, a tablet or capsule going down into the gut probably won't help because you may not be able to digest it.
I also have adrenal fatigue and am B12 deficient. Doc has me on B12 shots weekly (I give them to myself)and I take a sublingual B complex by NOW. I can't vouch that it's the greatest brand, etc., but with it being sublingual I know it has a much better chance of getting absorbed.