There are two different types of vitamin A. The first type, preformed vitamin A, is found in meat, poultry, fish, and dairy products. The second type, provitamin A, is found in fruits, vegetables, and other plant-based products.The most common type of provitamin A in foods and dietary supplements is beta-carotene.here are two different types of vitamin A. The first type, preformed vitamin A, is found in meat, poultry, fish, and dairy products. The second type, provitamin A, is found in fruits, vegetables, and other plant-based products.
Your doctor will tell you how many VALIUM tablets to take each day. The dose varies from person to person depending on age and the condition being treated. The usual adult dose is between 5 and 40 mg daily. Children, elderly and very ill patients may need to take less.
RDA of Selenium. The Institute of Medicine's Food and Nutrition Board advises that adults and adolescents over age 13 need 55 micrograms of selenium each day. Children up to 13 years old need less -- between 20 and 40 micrograms daily, depending on age and weight. Pregnant and lactating women need more. During pregnancy, a woman should aim to consume 60 micrograms of selenium each day. When she is nursing, she needs about 70 micrograms.