Chaga is a fungus that grows on Birch and other kinds of trees here in New Hampshire.
It is a nutrient-dense superfood that has tons of health benefits and can even treat/cure certain diseases. People take Chaga to reduce inflammation, boost the immune system and enhance liver health. It is very common to make tea from Chaga or ingest it via an extract.

New Hampshire Chronicle did a segment on Chaga Grove which is a medical supply store in Hooksett. They sell Chaga teas, extracts, even Monthly Mushroom Boxes so you can keep up with your daily dose of Chaga. I haven't tried it yet but I have heard it is actually pretty tasty!

As Chaga Grove says on their website, Keep Calm and Chaga on.