Herb Pharm - Usnea Extract - 1 oz. (29.6 ml) Herb Pharm Usnea Extract. Herb Pharm prepare their Usnea Extract from various species of Usnea lichens which have been Custom Wildcrafted in their native habitat. To assure optimal extraction & concentration of Usnea's usnic acid and other bioactive compounds, they custom extract the lichens with their special double-extraction process. Usnea extract, also called usnic acid or old man's beard, is a medicinal substance known as lichen -- a species mixture composed of a fungus and an algae. Traditionally, usnea was used to aid in digestion and treat common infections. A Healthy Farm Yields Healthy HerbsAt Herb Pharmthey grow most oftheir herbs on the "Pharm Farm" - their certified organic farm located in a rural valley of the Siskiyou Mountains in southern Oregon. As organic farmers, we never use synthetic fertilizers, herbicides and pesticides, nor dothey use genetically modified seeds. Instead, they employ fundamental, time-honored sustainable agriculture techniques including crop rotation, cover cropping, natural weed control such as hand weeding and flame weeding, and composting to condition our soil. Each year,their farm is inspected and certified as organic by Oregon Tilth. Oregon Tilth is a nonprofit organization supporting and promoting biologically sound and socially equitable agriculture through education, research, advocacy, and certification. Oregon Tilth Certified Organic (OTCO) is an internationally recognized symbol of organic integrity. The purpose of organic certification is to ensure that the agreed upon conventions of organic agricultural systems are being practiced not only by growers, but also by all the people who handle and process organic food, feed and fiber on its journey to the consumer.