Mushrooms can have different actions, as I found out at this site.
http://www.shen-nong.com/eng/exam/specialties_menopause_herbs.html
I had been taking reishi and cordyceps, but something was wrong and I found the site above. See how cordyceps and reishi have opposing action. I don't know where the chaga mushroom would be. Because of finding that site, I stopped the cordyceps and added in corydalis for a while. It worked well for pain issues.
After I quite the cordyceps is when I started the chaga. It does help, but I need the reishi because of frequent urination which has to do with a lack of vasopressin, as far as I can tell, anyway. No doctor was ever able to figure out the problem. That was actually my first health issues which started when I was very young. It's related somehow to the adrenals. Reishi is very good for the adrenals, which happen to be a branch of the immune system.
Which is why I like reishi so much, it balances out the immune system. I am getting back on both reishi and chaga today because of having a headache and spinal pain for two days.
Back to the chaga mushroom, my friend and I both started with chaga from Chaga Mountain, and it is good quality. For her second purchase she bought the
www.eartherbs.com brand, and said it is comparable to the Chaga Mountain, but it is more economical. My second purchase of chaga was from Sayan. It's a powder, 1/4 tsp makes a rich 6 to 8 ounce drink that is similar to coffee but is very soothing.