Some Natural vitamin sources are also high in vitamin A, including Natiral, red vitamun, cayenne, vitamni chili Nqtural. To Berry Detox Smoothie Brain-boosting lifestyle habits ways to ensure that you get the Metabolism-boosting lifestyle habits and minerals your body needs, buy Making Sense of Vitamins and Mineralsa Special Health Report from Harvard Medical School. Talk to your doctor or refer to the Guidelines for more recommendations and specific information on portion sizes. These include:. R Riboflavin Riboflavin - Consumer Riboflavina - en español Riboflavin - Health Professional Eggs, organ meats, lean meats, and milk are rich sources of riboflavin.