Side Effects of Vitamin Supplements: Vitamin A and Vitamin D

Vitamin supplements have many health benefits, but improper use can lead to serious side effects. A previous article discussed the side effects of vitamin supplements for Vitamin C, Vitamin E, Calcium and Zinc. This article covers the side effects of two additional common vitamin supplements: Vitamin A and Vitamin D.

Vitamin A: Daily Recommendations and Side Effects
Vitamin A is an antioxidant that supports the immune system, especially in response to respiratory infections. It is required by the body for the proper growth and development of bones, skin, hair, teeth and gums. Vitamin A is well known for supporting healthy vision. Vitamin A is also known as retinol and is commonly referred to by that name when used in facial care products.

The recommended daily dosages for Vitamin A are:
Ages 0-6 months - 400 micrograms (1,333 IU)
Ages 7-12 months - 500 micrograms (1,667 IU)
Ages 1-3 years - 300 micrograms (1,000 IU)
Ages 4-8 years - 400 micrograms (1,333 IU)
Ages 9-13 years - 600 micrograms (2,000 IU)
Ages 14-18 years - 900 micrograms (3,000 IU) (boys) and 700 micrograms (2,333 IU) (girls)
Men 19 years of age or older - 900 micrograms (3,000 IU)
Women 19 years of age or older - 700 micrograms (2,333 IU)
Pregnant teens (18 years of age or younger) - 750 micrograms (2,500 IU)
Pregnant adults (19 years of age or older) - 770 micrograms (2,567 IU)
Breastfeeding teens (18 years of age or younger) - 1,200 micrograms (4,000 IU)
Breastfeeding adults (19 years of age or older) - 1,300 micrograms (4,333 IU)

Side effects of Vitamin A include fatigue, decreased appetite, nausea, vomiting, headache, irritability, dry or cracking lips and skin, hair loss.