HOW MUCH VITAMIN A IS NEEDED?
RDA of vitamin A
Recommended daily allowance (RDA) of vitamin A
The necessary daily intake (RDA) of this vitamin is 4500 for men IU and 3500 IU for women.
These doses may vary according to age, sex or other special needs. For example, people with ulcerative colitis, Crohn's disease, pancreatitis, liver disease, etc.. use to present an intestinal vitamin A malabsorption.
Other people exhibit additional needs, such as women with abundant menstruation, pregnant women, etc. All of them may require additional doses of this vitamin
The following chart shows how the daily dose can vary according to sex, age, pregnancy or lactation parameters:
Special needs of vitamin A
Sometimes, a special intake of vitamin A should be taken into account. In this case more vitamin A containing foods to should be eaten to reach the adequate amount or, in accordance with the doctor, vitamin A supplements can be taken. The usual intake of vitamin A could be increased in the following cases:
- Smoking or ingesting drugs: Because they have a oxidant activity and attack vitamin A.
- Inadequate diet: Either people who do not eat enough vegetables, fruits or animal food containing vitamin A or people who usually undertake low-fat diets (Vitamin A is a fat-soluble vitamin and needs fat to be absorbed)
- Zinc deficiency: Zinc is necessary to synthesize vitamin A
Although additional supplementation of vitamin A may be necessary in this cases, one should never exceed the Recommended daily allowance (RDA) since vitamin A abuse can be very harmful, especially when it is done by Vitamin A supplements. This is especial applied to pregnant and breastfeeding women. The excess of this vitamin can affect the fetus or the baby.
More information about vitamin A in the listing above.
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This material is for informational purposes only. In case of doubt, consult the doctor.