In Chinese pharmacology it is known as "Ling Zhi" and a few of its therapeutic properties include calming the mind, dispelling phlegm, supporting the blood and qi. Because it is composed of B-glucan it boosts the immune system. It is also well-known for being adaptogenic, which means it has a normalizing action irrespective of the direction of the pathological state.
It can be taken during chemo and/or radiation to support those treatments. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3585368/
Consult with an acupuncturist or an herbalist for dosing recommendations.
Taking Vitamin C helps in the absorption of Reishi mushrooms.
Because Reishi has blood invigorating properties it should be used with caution and monitored for anyone taking blood thinning drugs.
***Do not consume Reishi mushrooms if you have a sensitivity or are allergic to them.