Support healthy immune system function with Propolis liquid extract from Herb Pharm. We prepare our Propolis Extract from the bee-collected resin known as Propolis. Honeybees harvest the crude resins from wild-growing trees, process it, and store it in their hives. The Propolis is then carefully collected from the honeybee hives and thoroughly extracted to produce this richly aromatic Propolis Extract. May rarely cause allergic reaction in certain individuals.