I pulled this from a website (tried to create shortcut, but it wouldn't let me)
Most women need 2,333 International Units, or 700 micrograms, of vitamin A each day, while men need 3,000 IU or 900 micrograms, according to the Linus Pauling Institute. Because vitamin A plays such an important role in a developing baby’s development, pregnant and breastfeeding mothers need more vitamin A -- 2,567 IU and 4,333 IU, respectively. A healthy and varied diet should provide adequate vitamin A to keep you healthy in most cases, but vitamin supplements -- taken under a doctor’s supervision -- can help pick up any slack to prevent a deficiency.
Conversely, overconsuming vitamin A eventually causes vitamin toxicity, called hypervitaminosis A. The toxicity affects your skin and hair -- you might notice excessive oil production on your skin and scalp, and you might also experience hair loss and skin flaking. Too much vitamin A can also prove-life threatening -- it causes fluid to build up in your skull. This increases pressure on your brain and can cause coma or even death. Do not exceed an intake 10,000 IU of vitamin A daily, advises the Linus Pauling Institute, or you put yourself at risk of hypervitaminosis A. Only preformed vitamin A -- the type found in animal products and some vitamin supplements -- causes hypervitaminosis A. The vitamin A in plants is found in an inactive form, called beta-carotene, which does not pose a health risk.