Propolis is a mixture that honey bees produce by mixing saliva and beeswax with exudate gathered from tree buds, sap flows, or other botanical sources.
Also known as: Bee Glue; Bee Putty
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https://medlineplus.gov/druginfo/natural/390.html
https://chriskresser.com/the-health-benefits-of-bee-products-with-carly-stein/