Has Anyone Here Known The Medicinal Chaga Mushroom?

Recently, I was given some Chaga by a good friend in Maine, who forages for it in the woods. It turned out that everyone there drinks it! Because of this, I started reading about it, and making chaga tea. It's wonderful! Apparently, it's a super antioxidant. What do you think? Has anyone here used it? Any down sides?
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You may need to process it. Most chaga is consumed in the form of an extract. You can learn more about chaga here: http://www.nootropedia.com/chaga/
Here is a really good article on turning the raw chaga mushroom into a medicinal tea: http://themushroomforager.com/2012/02/06/chaga-from-tree-to-tea/
Good luck!
OYASIN
^ Yes, that's how I make it, and I buy double tincture too.
Do you guys notice any difference?