My B12 level is about 2000 and my doctor has no problem there. I doubt the multi low amount of B12 has any bearing. Your B12 may be adequate in general. I take 1000mcg methyl B12 daily. Most days I do not take a multi at this point as I take so many supps separately. Age could have something to do with declining B12 levels. I started dosing with B12 probably 15 yrs ago and I'm 77 now.