There's a lot of vegan sources for B12, mostly fermented stuff like tempeh or powdered yeast leftovers from making beer. Some plants also have it. They are cheap and plentiful and usually used in a lot of vegan foods like "substitute cheese" or people blend them shakes because they are also rich in other aminoacids.
You can get all the B12 you need and even more from this while still being balanced in macro and micro-nutrients. Also B12 deficiency will usually make you psychotic or very very tired and to die from it you have to be completely depleted, if you live in the modern world and eat products made with fortifried grains, like white bread, pasta or some breakfast cereals, you will probably never go below the threshold were you cause damage.
There's also multiple protein shakes or meal replacement shakes that sell for like 2 dollars that have enough B12 for the daily recommended intake which is far far more than what you actually need as it's based on the old 2000 calorie diet thing.
You can get all the B12 you need and even more from this while still being balanced in macro and micro-nutrients. Also B12 deficiency will usually make you psychotic or very very tired and to die from it you have to be completely depleted, if you live in the modern world and eat products made with fortifried grains, like white bread, pasta or some breakfast cereals, you will probably never go below the threshold were you cause damage.
There's also multiple protein shakes or meal replacement shakes that sell for like 2 dollars that have enough B12 for the daily recommended intake which is far far more than what you actually need as it's based on the old 2000 calorie diet thing.