That translation didn't make any sense to me, either.
It’s true that B12 is an issue for vegetarians, especially vegans. Only bacteria and archaea can make cobalamin (B12). Certain bacteria that live in the digestive tracts of most animals, including humans, produce B12. However, in humans that happens in the colon, past the point where absorption can occur, so humans need to get it from their diet.
B12 is a micro-nutrient and we only need a very small amount – a few ug/day on average. It is stored in the liver and muscle tissue and humans can store it for years without needing to get it in the diet, but eventually you need to have some in your diet. (Or get an occasional B12 shot)
Because it is not in the diet of most vegans, they should take a non-animal source of B12 supplement. Also, older people and those who take certain drugs may lack “intrinsic factor” and not be able to absorb enough, so those people may need to get B12 shots or supplement with high doses of B12.
There are also sub-lingual supplements that are designed to be absorbed directly into the blood through tissues under the tongue, but I don’t know if there are any studies that confirm whether that actually happens or not with those supplements.
