Normally, we derive vitamin A from the food we eat, such as carrots, sweet potatoes, beef liver, salmon, and several dairy products.
Having a balanced, healthful diet should ensure that we have enough vitamin A in our systems.
How much vitamin A someone needs depends on their age, as well as other factors.
The National Institutes of Health (NIH) state that the ideal daily intake of vitamin A is 900 micrograms retinol activity equivalents (mcg RAE) for men and 700 mcg RAE for women aged 19–50.
