Bees make propolis, which they use to glue the materials of their hives together, by mixing beeswax and other secretions with resins from the buds of conifer and poplar trees. ... However, propolis does have proven antibiotic and antiseptic properties and may also have antiviral and anti-inflammatory effects.

https://www.drweil.com/health-wellness/.../what-are-the-benefits-of-bee-propolis/