Nature's Own Double Strength Cold Sore Relief is a potent formulation of Lysine, an essential amino acid for helping with the symptomatic relief, frequency and severity of cold sores. If symptoms persist consult your healthcare professional. Vitamin supplements should not replace a balanced diet. No added yeast, gluten, lactose, sugar, artificial colours or flavours, artificial sweeteners or preservatives, dairy products or animal-derived ingredients. Dosage Take 1 tablet daily with food or as recommended by your healthcare professional.