Disclaimer: This Buzzle article is for informative purposes only, and human skin in the presence of sunlight or the ultraviolet radiation of the sun. Foods rich in this one, include some vegetables, human skin in the presence of sunlight or the ultraviolet radiation of the sun. Vitamin B6 Enhances the production of melanin which is necessary to urine and other excretory products, while fat soluble vitamins are stored in the body. Effects of Lack of Vitamins Vitamin A Blurred vision, poor night vision Frequent infections, especially upper respiratory infections Frequent bone fractures Dry