Lion’s mane mushrooms are large white mushrooms that, according to registered dietitian Molly Knudsen, M.S., RDN, have a “shaggy, mane-like appearance.” Often used in salads, sauteed as a delicious side, or steeped in tea, as you can guess, these mushrooms get their name entirely based on their appearance. But just like many other forms of mushrooms, lion’s mane can also provide some significant benefits for your body.