BLITHE Pressed Serum Tundra Chaga for ultimate nutrition and friming 50ml Pressed Serum Tundra Chaga IS a high-nutrition serum that provides rich moisture and nutrition to the skin, as it is packed with 57.34% tundra chaga mushroom extracts, which contain rich beta-glucan. Combined with a blend of fermented oils, including olive and argan oils, it helps improve skin lines and elasticity.