Natural Factors Bee Propolis Throat Spray - Helps soothe a sore throat and relieves the symptoms of mouth and throat infections. Each spray contains the equivalent of 37.5 mg of dried propolis to help support immune function. Propolis is a source of antioxidants and contains antibacterial and antimicrobial activity, with propolis naturally protecting bee hives against some bacteria, viruses, and fungi. Natural Factors Bee Propolis is sustainably produced and non-GMO.