Propolis is a natural substance collected by honey bees from buds & trees. Propolis contains tree resin, essential oils, waxes & bioflavonoids. Bioflavonoids are one of the most important components in Propolis. The antioxidant effects of bioflavonoids may help to maintain a healthy immune system. This unique natural substance is subject to tests for potency & quality. Bee Health guarantee the bioflavonoids present are naturally occurring flavonoids, with no synthetic substances added.