I have always thought that B12 is only from animal foods.
Now I’m finding a few articles considering cordyceps a valid source of vitamin B12 but I cannot find anything confirming that.
Also, no one seems to know how much vitamin B12 cordyceps contain.
Any valid source about that?
mushrooms, including cordyceps, are an unreliable source of b12. same goes for fermented foods, they are highly unreliable sources of b12, if they have any of it to begin with. even animal meats, organs, and other products can be low in b12 depending on what foods and supplements are fed to the animal.
b12 is synthesized by some types of bacteria and other organisms found in soil and water. the mushrooms need to grow in area where they are directly exposed to these bacteria species through soil or water. and you need to eat the mushrooms without washing off all the dirt, because the fungus (mushroom) itself doesn’t produce b12.
animals also need to graze on open pasture in order to get b12 from the ingested soil. most factory farm animals these days are fed corn, soy, and husk, so they don’t get b12 from their food and need to be supplemented. so it’s generally a good recommendation for a lot of people to directly supplement a small amount of b12 through tablets or fortified foods instead of depending on animal foods/fermented foods/mushrooms, etc.