Propolis is a natural substance collected by honey bees from poplar trees. For 40 million years, bees have been using propolis in their hives to protect them from contamination. Source Naturals found a pure and potent propolis available in the cold, unpolluted environment.Can be used to drink or gargle, 4-5 drops in half a glass of warm liquid once or twice a day.External use: Apply to the skin where necessary using a cotton bud or piece of linen moistened with liquid.