among subjects who did not supplement their diets with vitamin b12 or multiple vitamin tablets , 92 % of the vegans ( total vegetarians ) , 64 % of the lactovegetarians , 47 % of the lacto-ovovegetarians and 20 % of the semivegetarians had serum vitamin b12 levels less than 200 pg/ml ( normal = 200-900 pg/ml ) .
C0042845
vitamin b12
C0978787
multiple vitamin