Dorothy I am glad they that are looking into it further for you, but 7 years years later :confused a bit slack, in my book.
The B complex i take in the morning as it gives me an energy boost, with the the b12 it shouldn't matter what time of day you take it, it's better taken on an empty stomach though, i take mine mid morning but that's up to the individual.

I am sure someone will be along shortly to explain all that technical stuff [explainSerum immunofixation] etc.