Vitamin A is a fat-soluble vitamin that is important for normal visual, immune and reproductive function. It can be further divided into preformed Vitamin A and provitamin A (beta-carotene), which come from different sources. The recommended daily dietary intake of Vitamin A for adults is 900 mcg for men and 700 mcg for non-pregnant women.
Vitamin A can appear as retinyl acetate, retinyl palmitate, beta-carotene or preformed vitamin A. You should only take a Vitamin A supplement when you have a Vitamin A deficiency or are unable to take sufficient Vitamin A from your diet. Vitamin A deficiency can cause night blindness, dry scaly skin, and an increased risk of infection.
Vitamin A is available as oral preparations. The usual adult dose of Vitamin A supplement is 2000-35,000 international units (IU) daily and taken with food. For specific dosages, refer to the product label.
The dosage of Vitamin A and beta-carotene can also be described as retinol activity equivalents (RAE).
Vitamin A supplements usually do not have side effects. However, because Vitamin A is a fat soluble vitamin, high dosages can accumulate in your body and cause symptoms such as dry itchy skin, hair loss and abnormal liver function.
Common dosing schedule:
This schedule is for reference only, adjustments may be made according to individual needs.
Some common medications Vitamin A may interact with:
Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.
Depending on the recommended daily dose of the products, Vitamin A can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. It can also be obtained from doctors.
For pharmaceutical products containing Vitamin A with a recommended daily dose of not less than 10,000 international units (IU), they require a prescription from a doctor to be purchased in a pharmacy. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.
For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at https://www.drugoffice.gov.hk
Need more information?
For detailed information about the use of Vitamin A (Supplement) in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.
Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.