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.
Do not take VALIUM for a longer time than your doctor has prescribed. VALIUM should be taken for short periods only (for example 2 to 4 weeks) unless advised by your doctor. Do not stop taking VALIUM or lower the dose without first checking with your doctor.
Adults should not consume more than 400 micrograms of selenium per day, according to the National Institutes of Health Office of Dietary Supplements. Some selenium supplements contain 200 micrograms.