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 of the northern United States. Our propolis is rich in bioflavonoids, vitamins, minerals and organic acids, and is naturally processed, without heat or chemicals. Source Naturals was created in 1982 to support each individual's potential to enjoy optimal health. Source Naturals' comprehensive Bio-Aligned Formulas help bring the power of alignment to your body. When formulating, we evaluate the underlying causes of system imbalances, and then provide targeted nutrition to interdependent body systems. Our line of more than 600 products also includes well-researched, single entity nutrients in their highest quality and most bioavailable forms.