This product is in a catagory all its own. I have been taking Chinese medicinal mushroom blends for years but Paul Stamets MyCommunity is of superior quality. I had lingering congestion from a case of the flu that just would not go away, apparent especially when I was tired, but in less than 48 hours after taking 4 caps of this product a day, all traces of it were completely gone, and this is after taking about 15 caps a day for a month of another hot water extracted mushroom blend product that had come highly recommended. I have also noticed a marked relief in the little aches and pains that I had come to consider normal for my body as my immune system gets freed up to go to work on all kinds of things. Paul Stamets is the number one expert on mushrooms in the world with another fascinating book out now called 'Mycelium Running'. He cares deeply about our planet, our local environment and our individual health and his whole life's work has revolved around mushrooms. I trust his products. He uses the mycelium in the product which are the tiny root filaments where a lot of the medicinal power is, not just the fruiting body of the mushroom as in most other products. His extraction process is superior and he puts no stearate flow agents into the product, as per the label, which is a major plus. I trust this product and have seen its efficiency in action, am very impressed and have recommended it to everyone I know.