There are benefits to eating many varieties of mushrooms. Lion’s Mane is one that has been studied in a few different countries, including the U.S. and has been found to be helpful in mild cognitive impairment and improving immune function. I do not know about the long term benefits or risks, but in one study I read, once research participants discontinued the supplement, the cognitive improvements declined to pre-supplement status. I think further study is necessary, and perhaps eating Lion’s Mane mushrooms as part of a healthy, whole foods diet, may be the best way to use them unless you are working with someone who has extensive knowledge about supplementing with concentrated forms.