Commonly referred to as Bee Glue, Now Foods Propolis is a natural substance that is collected by worker bees from the resin of select trees, and used to line their hives. With its high bioflavonoid content and immune supporting compounds, propolis has been used for centuries and may help in caring for minor wounds, boosting immunity and softening the skin. When taken as part of a healthy diet and lifestyle, Now Foods? 500 mg Propolis is a versatile supplement rich in a number of essential nutrients. Now Foods Propolis Plus Extract is an improved formula that now contains a Bee Propolis Extract that yields 20% more Propolis Resins per serving. Resins are the main beneficial constituents in Bee Propolis that are rich in flavonoids.