Deficiency of vitamin A is rather rare, as the liver can store enough for months or even years before it is depleted, even if none is consumed in the diet.

Vitamin A deficiency can result in dry skin, eyes, and mucous membranes, loss of vitamin C, impaired night vision, degeneration of tooth enamel and gums. Also can be problem with bone growth, sinus trouble, loss of smell, and increased susceptibility to infections.

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Symptoms of Vitamin A overdose include blurred vision, bone pain, headaches, diarrhea, loss of appetite, skin scaling and peeling, and muscular weakness. Vitamin A toxicity doesn’t usually occur until you’ve been taking really large doses (more than 25,000 IU daily) for a long time, but don’t take any chances—stick to the RDA.

Babies and children can reach toxic Vitamin A levels at much smaller doses. Most multivitamin supplements contain only the RDA, but some contain 10,000 IU (2,000 RE) or even more.

Read labels carefully and talk to your doctor before giving vitamins to babies and children.

Fortunately, most symptoms of Vitamin A toxicity gradually go away without lasting damage when you stop taking it.

Be very careful about Vitamin A supplements if you are or might become pregnant. Too much Vitamin A (over 5,000 IU or 1,000 RE) can cause birth defects, especially if taken in the first seven weeks of pregnancy—when you might not even realize you’re pregnant.

Today many doctors suggest that women of childbearing age take beta carotene instead of Vitamin A supplements.

Symptoms of Vitamin A overdose

Adult and children symptoms of overdose of Vitamin A are differing. Children can feel appetite loss, bone pain, bulging fontanel, irritability, Lethargy, stunted growth.
Vitamins A overdose symptoms for adult include:

appetite loss, blurred vision, diarrhea, drowsiness, hair loss, headaches, irribility, lethargy, muscle weakness, skin scaling and peeling, vomiting.
So it is important to understand that 60,000 IU of vitamin A given for long periods of time could lead to vitamin A toxicity, but generally this would only occur if doses in excess of 50,000 IU were used for several years.

Smaller doses may produce toxicity symptoms if there are problems in storage and transport of vitamin A.

These problems are generally found only in people with cirrhosis of the liver, hepatitis, or malnutrition and in children and adolescents. However, for a period of only one month, as in this study, vitamin A toxicity is of virtually no concern.