It's good to be a birch. Birch velvet alias chaga, also known as Inonotus obliquus. The mycelium of Betula platyphylla is cold-resistant, and the mycelium living in wood can withstand the low temperature of-40℃. It is a dual-purpose product with many functions and good efficacy, which can help the human body improve many problems and has the effects of delaying aging, lowering blood sugar and preventing allergies.