In the mycotherapy there are almost no side effects at all. Sometimes people recognise a slight change in their digestion, which is related to the diatary fibre and the indigestive fungus protein. By means of a reduced dose the body is able to slowly get used to the fungi.

In individual cases it is possible that persons suffering from allergic food disorder might show allergic reactions after eating vital fungi products. When eating the Shiitake, people with an appropriate disposition reacted with a pruritic skin rash. This has to be understood as a detoxication reaction, which can be attenuated by absorbing a less concentrated dose and eventually will fully diminish.