Natural Factors Vitamin A - 10,000 IU - A fat-soluble nutrient, important for the healthy development and maintenance of eyes, bones, teeth and connective tissues. Maintaining proper levels of Vitamin A will help promote faster and more thorough wound healing, boost the immune system and help maintain healthy skin and bones. Natural Factors Vitamin A supplement is derived from Cod Liver Oil, and is an excellent source of this important nutrient.