Formulated with natural active ingredients that stimulate the body's natural defenses. We all want our eyes to be white and clear, but many are concerned about the chemicals found in redness relieving eye drops. Most over-the-counter redness relieving eye drops use chemicals such as vasoconstrictors to mask symptoms. Vasoconstrictors may actually worsen the symptoms if used more than directed (usually 4 times a day maximum). Similasan works differently, by using natural botanical extracts to stimulate the body's natural defenses and target the root cause. Similasan products are made without harsh chemicals, so you can use them as often as needed.