100% Pure Lysine + Herbs Lip Balm Cold Sore Treatment uses lysine; an amino acid (naturally found in milk, poultry, eggs, and potatoes) that has been shown in studies to prevent cold sore virus from multiplying, greatly reducing the length and severity of an outbreak. Additional herbs in 100% Pure Lysine + Herbs Lip Balm Cold Sore Treatment help to alleviate cold sore symptoms, such as burning, itching, and irritation, while coconut oil provides deep hydration. Its a soothing, holistic remedy in a tube! Please note: You may notice small black specks in the lip balm. This is completely normal. This ingredient is propolis, a natural antibiotic and antifungal substance collected from trees that brings relief to various ailments including inflammations, viral diseases, ulcers, and cold sores.