Bio propolis cold sore barrier ointment is formulated with carefully selected skin protectives and propolis extract bio propolis cold sore barrier ointment contains a patented propolis extract collected from the hives of bees that feed on a special variety of canadian poplar trees bio propolis can be used at any stage of the cold sore39s development it is designed to be rapidly applied to soothe the cold sore area and form a protective barrier to the elements allowing the skin39s