These 4 powerful polypore mushrooms are boiled in the maple sap during the syrup-making process, effectively extracting the water soluble constituents, including the valuable polysaccarides, such as PSK, into the finished maple syrup. So the resulting syrup is also a concentrated hot water extract, elegantly preserved with the maple sugars. This is an excellent tasting alternative to alcohol-preserved extracts. A 2 oz bottle contains the extract of 15 grams of dried medicinal mushrooms. Wild Branch Mushrooms