Vitamin B12 is not just one vitamin. They come in several forms and collectively are called vitamin B or cobalamins because they all contain the mineral cobalt.
People who have trouble absorbing vitamin B12 from foods, as well as vegetarians and vegans, that don't eat animal foods, are required and will benefit from vitamin B12-fortified food because plant foods don't contain vitamin B12.
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Vitamin B-12 Added To Foods
Vitamin B-12 is found naturally in some foods and added to others. Food companies add vitamin E to different foods like breakfast cereals, fruit juices, margarine, and spreads. They fortified the foods by having the vitamin added to them. (source 🗗)
You can find benefits of vitamin B12 in Vitamin B12: 6 Research-Backed Benefits .
Vitamin B-12 Deficiency
Vegetarians and vegans are at greater risk of developing vitamin B-12 deficiency because natural vitamin B12 is only found in animal foods. They need added Vitamin B-12. Fortified breakfast cereals and fortified nutritional yeasts are some of the only sources of vitamin B12 from plants. (source 🗗)
Synthetic vitamin B12
Synthetic vitamin B12 that is added to fortified foods, is in a free form. It means that the body can absorb it quicker than when it comes from food sources. Even people with atrophic gastritis, that can't absorb vitamin B12 from foods, can usually absorb the synthetic vitamin B12. (source 🗗)