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From almost anything from the plant part of living things. The most common sources are yeast and mushrooms. But it’s mostly based on, on the geography basically. Because we as a western civilization, we historically drink beer and eat bread. So if there is a lot of mushrooms around, they are very cheap. So we used to (or we are used to) derive glucan from yeast.

People in china and Japan they use mushrooms as old folks’ remedy because they have a lot of mushrooms and it’s common to pick up mushrooms and eat them. So they derive beta glucan from, from mushrooms.