I cannot recommend Olive Leaf Extract highly enough. I first heard about it in a magazine article about 16 years ago and its anti-viral properties. All my life I had suffered from cold sores and dreaded one appearing when I had an important event coming up or stress like exams. Since then I have been taking Olive Leaf extract every day and have not suffered one cold sore in 16 years. Thank you so much for giving me my life back. I also take Joint Formula and have so far found this very effective.