Vitamin A: Daily Needs, Food Sources & Deficiency

At a glance

Women, 19-50

700 mcg RAE

Men, 19-50

900 mcg RAE

Upper limit (adults)

3,000 mcg RAE/day (preformed vitamin A only)

How common is deficiency?

Uncommon in high-income countries; COMMON in low-income regions (sub-Saharan Africa, South Asia)

Food sources

Animal sources

Beef/chicken liver, cod liver oil, eggs, whole milk, butter, cheese, fatty fish

Plant sources

Beta-carotene foods: sweet potato, carrots, pumpkin, spinach, kale, mango, cantaloupe, red palm oil

Deficiency and testing

Signs of deficiency

Night blindness, dry eyes (xerophthalmia), Bitot spots, dry/rough skin, frequent infections, impaired growth in children

Who is at higher risk

Young children and pregnant women in low-income countries; fat malabsorption (celiac, cystic fibrosis, bariatric surgery); chronic alcohol use

How it is tested

Serum/plasma retinol (HPLC); retinol-binding protein (RBP); relative dose response (RDR) test; dark-adaptation test; conjunctival impression cytology

Cut-offs

Serum retinol <0.70 umol/L (about <20 mcg/dL) = deficiency (WHO); <0.35 umol/L = severe

Symptoms are not specific. Only a clinician with the right tests can tell whether you are deficient.

Supplement forms

Common forms

retinyl palmitate/acetate (preformed), beta-carotene (provitamin), cod liver oil, mixed carotenoids.

More effective

retinyl palmitate/acetate in oil-based softgels taken with a fat-containing meal (fast repletion, e.g., for deficiency). Beta-carotene is a safer way to raise intake in pregnancy and for non-deficient people because the body converts only what it needs.

Less effective

dry tablets taken fasting (poor absorption without fat); high-dose beta-carotene in smokers (linked to higher lung cancer risk); preformed vitamin A above the UL, especially in pregnancy (birth defects, liver toxicity); cod liver oil as a main source if it pushes vitamin A past the UL.

Safety, interactions and halal notes

Safety and interactions

Upper limit for adults: 3,000 mcg RAE/day (preformed vitamin A only). Going above the upper limit over time can cause harm, so check labels and talk to a clinician before high-dose supplements.

Halal note

Vitamin A is often sold in gelatin softgels or gelatin-coated beadlets. Check the shell and the carrier, and ask for the halal certificate. This is general guidance, not a certification.

Frequently asked questions

How much Vitamin A do adults need per day?

Women 19-50: 700 mcg RAE. Men 19-50: 900 mcg RAE. Upper limit: 3,000 mcg RAE/day (preformed vitamin A only). Needs change with age, pregnancy and health conditions.

What are the signs of Vitamin A deficiency?

Night blindness, dry eyes (xerophthalmia), Bitot spots, dry/rough skin, frequent infections, impaired growth in children. These signs are not specific, so only a clinician with the right tests can confirm a deficiency.

What are the best food sources of Vitamin A?

Animal sources: Beef/chicken liver, cod liver oil, eggs, whole milk, butter, cheese, fatty fish. Plant sources: Beta-carotene foods: sweet potato, carrots, pumpkin, spinach, kale, mango, cantaloupe, red palm oil.

Which form of Vitamin A supplement is best?