I would rather buy my supplements from Amazon or a health food store. I only buy supplements from a company that I recognize. There are some fakes out there. Some good brands are NOW, Nutricost and Swanson Vitamins. This is the brand of Reishi that I take. I take 2 capsules a day. One in the morning and one in the afternoon.
https://www.amazon.com/gp/product/B08FCJ3BY8/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
I would also add that there are many other anti andogens that you can take. Mint is one. You can get a supplement or drink a few cups of herbal mint tea. You can buy at your grocery store. I drink mint tea and take reishi.