For Vegetables

How much vitamin A, in a day, is considered toxic?

I heard that Vitamin A toxicity can occur at doses of 15000 IU in a day? Just curious, how many percent of the recommended daily intake is that? An 8 ounce glass of carrot juice contains about 630% of the recommended daily intake, is this over 15000 IU? Is there an equation to convert IU to the percentage? What is IU in general? Thanks for your time!

Public Comments

1. http://www.chiroweb.com/archives/11/07/06.html Some people have symptoms with 50,000 IU a day yet the article says people suffering from acne were taking 1 million a day with no side effects! Depends on the person!
2. The recommended daily intake of Vitamin A is 3000IU for men and 2333IU for women. A safe limit for most people is 10000IU to 25000IU per day, depending on which research you use. The Vitamin A upper limit for those over 65 and with liver problems is 10000-15000IU/day. Keep in mind that the RDA (recommended daily allowance) is usually the absolute minimum suggested for proper nutrition, so exceeding the RDAs a little is not usually a risk. Check with a medical professional before taking action. The 630% should not be a concern. Much of the Vitamin A in carrots comes from beta carotene, which the body converts into Vita A as needed. Getting your Vita A from beta carotene is a good way to avoid getting "too much" Vitamin A, since your body will only convert what it needs in to Vita A. If you're taking Vitamin A supplements and medication, there is a chance that they may reduce the effectiveness of each other. You check here for a list of medications and Vitamin A: http://www.cncahealth.com/health-notes.htm?org=cnca&ContentID=3250005 I hope that helps!