A. Vogel bio propolis cold sore barrier ointment 2g a clinically proven cold sore treatment made from purified propolis extract from canadian popular trees. It contains a specific spectrum of active ingredients, termed acf active complex of flavonoids. Propolis has been used as a medicine for more than 2000 years. It consists of the plant exudates that honeybees collect and take to the hive, where other bees mix them with beeswax to make an antiseptic sealant for the crevices in the hive. Propolis is also used to make the surfaces smooth and to reduce the size of the hives entrance so that invaders find it harder to get in. Propolis is the bees antiseptic, reducing the growth of bacteria, viruses and moulds inside the hive. It is also used to embalm dead invaders, so that their bodies cannot spread infection.