I would think that a B-12 blood test will best predict how you assimilate B-12. I take 380 mcg B-12 daily. My recent B-12 level was 1060. My nutrition physician said that it is an optimum level. The standards say much less than 900.

I take 1400 IUs of D3 but my blood level was low. He wants me to add another 3000 IUs to my daily regimen.

He wants me to read "The Edge" by Eric Braverman, MD.

Has anybody read "The Edge" ?