Yog tias koj tus menyuam tsis tu ncua noj cov khoom noj siv mis thiab qe (lacto-ovo-vegetarian), nws cov vitamin B12 txaus. Txwv tsis pub, nws yog qhov yooj yim dua rau qhov tsis muaj vitamin B12 uas feem ntau pom hauv cov khoom tsiaj. Soy formulas (soy), fortified cereals, poov xab, fortified soy los yog txiv ntseej dej qab zib yog qhov chaw ntawm vitamin B12. Yuav tsum tau them nqi ntxiv. Ntxiv dua thiab, nrhiav cov lus qhia ntawm tus kws kho mob. Yog hais tias leej niam yog vegan, niam mis yuav muaj vitamin B12 tsawg heev thiab tus me nyuam mos yuav tsum tau noj cov vitamin B12 ntxiv. Nws raug nquahu kom suav nrog tsawg kawg peb zaug hauv ib hnub ntawm cov khoom noj uas muaj vitamin B12 lossis ntxiv ntawm 5 µg rau 10 µg ntawm vitamin B12.