What is vitamin A-oral, and how does it work (mechanism of action)?

  • Oral vitamin A is used to treat vitamin A deficiency. Carotene compounds (found, for example, in egg yolk, butter and cream) are gradually converted by the body to vitamin A (retinol). Vitamin A supports growth and bone development, vision, reproduction, and development and maintenance of skin tissue. It may also improve function of the immune system and prevent some cancers. A form of vitamin A called retinal is responsible for transmitting light sensation in the retina of the eye. Deficiency of vitamin A leads to night blindness.

What brand names are available for vitamin A-oral?

Natures Way Vitamin A, Now Foods Vitamin A, GNC Vitamin A, and many more brands

Is vitamin A-oral available as a generic drug?


Do I need a prescription for vitamin A-oral?


What are the uses for vitamin A-oral?

Vitamin A is used for prevention and treatment of vitamin A deficiency.

What are the side effects of vitamin A-oral?

Side effects of vitamin A include (The frequency of side effects was not reported.):

Possible serious side effects include:

What is the dosage for vitamin A-oral?

  • The recommended dose for routine treatment of vitamin A deficiency is 10,000-20,000 units per day vitamin A for 2 months.
  • The recommended dose for treating severe vitamin A deficiency is 100,000 units orally for 3 days, followed by 50,000 units daily for 2 weeks then 10,000 to 20,000 units daily for 2 months.
  • The dose for preventing vitamin A deficiency is 10,000 to 50,000 units daily.

Which drugs or supplements interact with vitamin A-oral?

Concurrent use of isotretinion (Amnesteem, Claravis), tretinoin (Retin-A) and vitamin A may result in increased risk of vitamin A toxicity.


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Is vitamin A-oral safe to take if I'm pregnant or breastfeeding?

Recommended daily allowance of vitamin A is safe to use during pregnancy and is compatible with breastfeeding.

What else should I know about vitamin A-oral?

What preparations of vitamin A-oral are available?

  • Capsule: 7,500, 8000, 10,000, 25,000 Units
  • Tablets: 10,000, 15,000 Units

How should I keep vitamin A-oral stored?

Vitamin A should be stored in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.


Vitamin A (Natures Way Vitamin A, Now Foods Vitamin A, GNC Vitamin A, and many more brands) is a supplement used to prevent and treat vitamin A deficiency. Common side effects of vitamin A supplements include:

Drug interactions, dosage, and pregnancy and breastfeeding safety information should e reviewed prior to taking any vitamin or supplement.

Treatment & Diagnosis

Medications & Supplements

Prevention & Wellness


According to the USDA, there is no difference between a “portion” and a “serving.” See Answer

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Medically reviewed by John P. Cunha, DO, FACOEP; Board Certified Emergency Medicine


National Institute of Health Office of Dietary Supplements