Can-C contains a special analogue of the N-Acetylcarnosine, a naturally occurring nutrient that combines two amino acids or protein fragments. This particular form is known as N-acetyl or NAC and is the main ingredient due to its potency at cleaning up free radicals, the root cause of tissue damage.As a preventative measure, 2-drops into each eye once a day with frequent breaks may be a suitable on-going regime. Maximum recommended dose is one to two eye drops moisturizing twice daily, or as directed by a medical health professional. Please do not exceed recommended dosage. It is recommended that occasional use of N-acetyl eye-drops continue even after the reduction. Measurable affects can occur within only 1 month of use. For maximum efficacy, the recommended administration is 3-5 months.Caution : always avoid contamination by replacing cap after use. Do not touch the end of the vial to any surface. Do not allow others to use your vial. Once a vial is open keep it in a fridge. Unopened may be stored out of sunlight at room temperature. Keep out of reach of children.*This product and its statements have not been evaluated by the FDA. This product is not intended to cure or prevent disease.