Chaga mushroom is a good source of absorbable SOD. Yet, its most potent ingredient is a special substance known as superoxide dismutase (SOD). This is an enzyme with great potency. Its function is to halt oxidation, especially the toxicity of a free radical known as singlet oxygen. This is the type of oxygen which is responsible for oxidizing and damaging the tissues, which results in aging. It is the same oxygen which rusts a nail. SOD blocks this damage by quenching the singlet oxygen free radical. The SOD content per gram of chaga is exceedingly high and accounts for many of its historical powers. Tests performed on North American Herb & Spice’s wild chaga prove that it contains some 10,000 to 20,000 active SOD units per gram. This is an exceedingly high amount, far higher than that found even in typical SOD pills. The typical SOD pill contains from 200 to 2,000 units per serving. So the difference is considerable. Plus, the type in pills is virtually impossible to absorb, while the wild chaga type is well-utilized by the body.