This may be a worthwhile test to have when eating a plant-based diet because it is mostly found in animal products.
Important functions include brain function, DNA replication and making healthy red blood cells.
Sources: Dairy products. Eating dairy products is one of the simplest ways to get enough vitamin B12 in a vegetarian diet.
Eggs. Another source of B12 for vegetarians is eggs. One large, hard-boiled egg contains 0.6 mcg of vitamin B12, or 25% of your DV.
Fortified foods like tempeh, soy milk, tofu and cereals along with nutritional yeast.