Long story short I'm 26 and had some tests done for unspecified fatigue, but the results were very odd and make no sense and I've never hear of a profile like this, which worries me:

not vegiterian,
Had a physical -- no abnormalities except the following.
had serum b12 level, b6, folic acid, homocysteine, MMA (serum), etc. -- all normal, except b12 was slightly elevated (900's), folate was slightly elevated, homocysteine was slightly elevated (17), MMA was normal according to lab -- 0.253.

I take a good multivitamin daily (and have for last 10 years). It contains 100 mcg of b12.

I was invited through a friend to try a new intracellular analysis. It said there was a mild b12 deficiency (but no other problems) !! My doctor doesn't think it's possible, but in restrospect, my MMA doesn't look great (though it's normal). She said I could try a sublingual b12 tablet daily for a couple of months then she would retest everything.

I'm relatively familiar now with this stuff, and I understand that MMA is a better indicator than serum b12 level, but how can someone's b12 level be close to a 1000, and they're still deficient?