Vitamin A: (Beta Carotene) Helps maintain smooth, soft disease-free skin; helps protect the mucous membranes of the mouth, nose, throat lungs, which helps reduce our susceptibility to infections; protects against air pollutants and contaminants; helps improve eye sight and counteracts night-blindness; aids in bone and teeth formation; improves skin elasticity, moisture content and suppleness; and helps reverse the signs of photo-aging. A lack of vitamin A can cause skin to become dry and hardened. Go to the Vitamins Dictionary and look up Vitamin A.