What other names is Vitamin A known by?
3-Dehydroretinol, 3-Déhydrorétinol, Acétate de Rétinol, Antixerophthalmic Vitamin, Axerophtholum, Dehydroretinol, Déhydrorétinol, Fat-Soluble Vitamin, Oleovitamin A, Palmitate de Rétinol, Retinoids, Rétinoïdes, Retinol, Rétinol, Retinol Acetate, Retinol Palmitate, Retinyl Acetate, Rétinyl Acétate, Retinyl Palmitate, Rétinyl Palmitate, Vitamin A
Acetate, Vitamin A Palmitate, Vitamin A1, Vitamin A2, Vitamina A, Vitamine A, Vitamine A1, Vitamine A2, Vitamine Liposoluble, Vitaminum A.
What is Vitamin A?
Vitamin A is a vitamin. It can be found in many fruits, vegetables, eggs, whole milk, butter, fortified margarine, meat, and oily saltwater fish. It can also be made in a laboratory.
Vitamin A is used for treating vitamin A deficiency. It is also used to reduce complications of diseases such as malaria
, and diarrhea
in children with vitamin A deficiency.
Women use vitamin A for heavy menstrual periods, premenstrual syndrome
), vaginal infections, yeast infections, "lumpy breasts
" (fibrocystic breast disease
), and to prevent breast cancer
. Some women with HIV
use vitamin A to decrease the risk of transmitting HIV
to the baby during pregnancy
, childbirth, or breast-feeding.
Men use vitamin A to raise their sperm count.
Some people use vitamin A for improving vision and treating eye disorders including age-related macular degeneration
, and cataracts
Vitamin A is also used for skin conditions
, cold sores
, wounds, burns
follicularis (Darier's disease
), ichthyosis (noninflammatory skin scaling), lichen planus
pigmentosus, and pityriasis rubra pilaris
It is also used for gastrointestinal ulcers, Crohn's disease
, gum disease
, Hurler syndrome (mucopolysaccharidosis), sinus infections, hayfever, and urinary tract infections
Vitamin A is also used for shigellosis, diseases of the nervous system, nose infections, loss of sense of smell, asthma
, persistent headaches
, kidney stones
, overactive thyroid
, iron-poor blood (anemia
), deafness, ringing in the ears
, and precancerous mouth sores
Other uses include preventing and treating cancer
, protecting the heart and cardiovascular system
, slowing the aging
process, and boosting the immune system.
Vitamin A is applied to the skin to improve wound
healing, reduce wrinkles
, and to protect the skin against UV radiation
- Vitamin A deficiency. Taking vitamin A by mouth is effective for preventing and treating symptoms of vitamin A deficiency. Vitamin A deficiency can occur in people with protein deficiency, diabetes, over-active thyroid, fever, liver disease, cystic fibrosis, or an inherited disorder called abetalipoproteinemia.
Possibly Effective for...
- Breast cancer. Premenopausal women with a family history of breast cancer who consume high levels of vitamin A in their diet seem to have reduced risk of developing breast cancer. It is not known if taking vitamin A supplements has the same benefit.
- Cataracts. Research suggests that high intake of vitamin A in the diet is linked to a lower risk of developing cataracts.
- Diarrhea related to HIV. Taking vitamin A along with conventional medicines seems to decrease the risk of death from diarrhea in HIV-positive children with vitamin A deficiency.
- Malaria. Taking vitamin A by mouth seems to decrease malaria symptoms in children less than 3 years-old living in areas where malaria is common.
- Measles. Taking vitamin A by mouth seems to reduce the risk of measles complications or death in children with measles and vitamin A deficiency.
- Precancerous lesions in the mouth (oral leukoplakia). Research suggests that taking vitamin A can help treat precancerous lesions in the mouth.
- Recovery from laser eye surgery (photoreactive keratectomy). Taking vitamin A by mouth along with vitamin E seems to improve healing after laser eye surgery.
- Complications after pregnancy. Taking vitamin A seems to reduce the risk of diarrhea and fever after pregnancy in malnourished women.
- Complications during pregnancy. Taking vitamin A by mouth seems to reduce the risk of death and night blindness during pregnancy in malnourished women.
- Eye disease affecting the retina (retinitis pigmentosa). Research suggests that taking vitamin A can slow the progression of an eye disease that causes damage to the retina.
Possibly Ineffective for...
- Breathing problems that affect newborns (bronchopulmonary dysplasia). Research shows that injecting vitamin does not reduce the risk of breathing problems in low birth weight infants.
- Gastrointestinal side effects of chemotherapy. Taking vitamin A by mouth does not prevent or reduce gastrointestinal side effects of chemotherapy in children.
- Fetal and early infant death. Taking vitamin A supplements before, during, or after pregnancy does not seem to reduce the risk of fetal or early infant death when taken by malnourished women. However, giving vitamin A to some infants seems to lower the risk of infant death in areas where malnutrition or vitamin A deficiency is common.
- A type of skin cancer called melanoma. Research shows that taking vitamin A by mouth does not increase disease-free survival in people with melanoma.
- Miscarriage. Women who take vitamin A by mouth, alone or in combination with other vitamins before or during early pregnancy, do not have a lower risk of miscarriage or stillbirth.
- Osteoarthritis. Taking a specific product containing selenium, vitamin A, vitamin C, and vitamin E (Selenium ACE) does not appear to improve osteoarthritis. Also, taking additional vitamin A does not reduce pain in people with spinal osteoarthritis who have adequate levels of vitamin A.
- Tuberculosis. Low levels of vitamin A are common in people with tuberculosis. However, taking vitamin A does not appear to improve symptoms or decrease the risk of death in people with tuberculosis.
Likely Ineffective for...
- Head and neck cancer. Taking vitamin A by mouth does not reduce the risk of developing new tumors or improve survival in people with head and neck cancer.
- HIV transmission. Taking vitamin A by mouth does not lower the risk of passing HIV to the fetus during pregnancy, to newborns during delivery, or to infants during breastfeeding. In fact, early research suggests that HIV-positive women who take vitamin A supplements during pregnancy might have an increased risk of passing HIV to their babies through breast milk.
- Lower respiratory tract infections. Taking vitamin A by mouth does not prevent or reduce symptoms of lower respiratory tract infections in children. In fact, vitamin A is linked to a slight increase in the risk of respiratory tract infections in children.
- Pneumonia. Taking vitamin A by mouth does not help treat or prevent pneumonia in children living in developing countries.
Insufficient Evidence to Rate Effectiveness for...
- Alcohol-related liver disease. Early research shows that taking vitamin A together with coenzyme Q10 and other vitamins and minerals does not improve survival in people with alcohol-related liver disease.
- Anemia. Taking vitamin A may help increase levels of proteins that store iron. This may reduce the risk of anemia in children and pregnant women. However, in developing nations in which anemia is common, taking vitamin A (retinol) with iron and folate does not seem to improve anemia in pregnant women compared to taking only iron and folate.
- Cervical cancer. Research suggests that increased vitamin A levels in the blood or higher vitamin A intakes are associated with a lower risk of cervical cancer. However, this only appears to be the case when both forms of vitamin A, retinol and carotenes, are considered. Intake of retinol alone is not linked with a reduced risk of cervical cancer.
- Child development. Taking vitamin A does not appear to improve growth in children with normal nutrition. However, taking vitamin A might improve growth in children with vitamin A deficiency.
- Cancer that starts in the bone marrow (chronic myelogenous leukemia (CML)). Early research shows that taking a specific vitamin A product (Aquasol, Armour Pharmaceuticals) together with busulfan therapy does not improve survival in people with chronic myelogenous leukemia. Taking vitamin A with busulfan therapy might also increase the risk of toxicity.
- Rectal damage caused by radiation therapy. Early research suggests that taking vitamin A (retinol palmitate) can reduce rectal symptoms caused by pelvic radiotherapy.
- Colorectal cancer. Taking vitamin A alone or in combination with beta-carotene does not seem to prevent colorectal cancer.
- Esophageal cancer. Some population research suggests that higher intake of beta-carotene and vitamin A is linked to a reduced risk of esophageal cancer. However, other higher quality evidence suggests that taking vitamin A in combination with beta-carotene does not prevent esophageal cancer.
- HIV. Taking vitamin A during pregnancy does not seem to reduce the risk of death for the mother or child. Also, vitamin A supplementation during pregnancy does not seem to prevent HIV progression in women with HIV and low levels of vitamin A. However, giving vitamin A to HIV-positive infants and children seems to reduce the risk of HIV-related death.
- Lung cancer. Early research suggests that taking vitamin A by mouth might improve survival and reduce the development of new tumors in people with lung cancer. However, other research shows that vitamin A has no effect on lung cancer survival. Also, vitamin A seems to increase the risk of lung cancer in smokers and people exposed to asbestos.
- Ovarian cancer. Population research suggests that taking vitamin A does not reduce the risk of developing ovarian cancer.
- Overall mortality. Giving vitamin A to children aged 6 months to 5 years seems to decrease the risk of death, especially in those at risk for vitamin deficiency. However, taking vitamin A does not seem to reduce the risk of death in healthy adults.
- Pancreatic cancer. Taking vitamin A in combination with beta-carotene does not seem to prevent pancreatic cancer.
- Prostate cancer. Vitamin A intake from the diet does not seem to be linked with a reduced risk of prostate cancer.
- Stomach cancer. Taking vitamin A alone or with beta-carotene does not seem to prevent stomach cancer.
- Promoting good vision.
- Age-related macular degeneration (AMD).
- Preventing and speeding recovery from infections.
- Improving immune function.
- Wound healing.
- Relieving hay fever symptoms.
- Other conditions.
More evidence is needed to rate vitamin A for these uses.
Natural Medicines Comprehensive Database rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, and Insufficient Evidence to Rate (detailed description of each of the ratings).