B complex does not suit me at all so I take B12 and multivitamin and mineral which seems to be better. I had to try several multivitamins before I found one that suited me though. I guess the dosages of various B vits vary in each. Not sure which bit upsets me (terrible migraine) but seem to be ok with this combination.
They may have come across this issue before and may be able to suggest what is the likely culprit, because they all take B12 and probably take other B vitamins as well.
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