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Vitamin A is one of the most important fat-soluble vitamins, essential for vision, immunity, skin and growth. It is also one of the vitamins where both too little and too much can cause problems. Understanding its two main forms, and where they come from, helps you get the balance right.

What Does Vitamin A Do?

• Vision: vitamin A forms rhodopsin, a pigment in the retina needed to see in low light. Night blindness is one of the earliest signs of deficiency.
• Eye surface health: it keeps the cornea and conjunctiva moist; see our eye health guide.
• Immunity: it supports the barriers of skin, gut and airways and the function of immune cells.
• Skin: it regulates skin cell renewal. Topical retinoids, derived from vitamin A, are among the best-studied anti-ageing ingredients; see healthy skin after 50.
• Growth and reproduction: it is vital for fetal development.

Two Forms of Vitamin A

Preformed vitamin A (retinol and retinyl esters)

Found in animal foods. The body can use it directly. Rich sources include:

• Liver (beef, chicken, fish)
• Cod liver oil and other fish liver oils
• Butter and ghee from grass-fed cows
• Egg yolks
• Whole milk, cheese and oily fish

Traditional products such as fermented cod liver oil and high-vitamin butter oil contain naturally occurring retinol; read our guides to cod liver oil and butter oil.

Provitamin A carotenoids (mainly beta-carotene)

Found in plants. The body converts them into vitamin A as needed. Rich sources include:

• Sweet potatoes, carrots and pumpkin
• Dark leafy greens: spinach, kale, collards
• Red peppers
• Mangoes, apricots and cantaloupe

Conversion efficiency varies a lot between people due to genetics, gut health and fat intake. Eating carotenoid-rich vegetables with some fat improves absorption.

How Much Do You Need?

Vitamin A is measured in micrograms of retinol activity equivalents (RAE). The US RDA is:

• Men: 900 mcg RAE per day
• Women: 700 mcg RAE per day
• Pregnancy: 770 mcg RAE; breastfeeding: 1,300 mcg RAE

Deficiency: A Global Concern

In high-income countries, deficiency is uncommon except in people with fat malabsorption conditions. Globally, the World Health Organization identifies vitamin A deficiency as a leading cause of preventable childhood blindness, and it increases the risk of severe infections such as measles. Signs include:

• Night blindness
• Dry eyes and, in severe cases, damage to the cornea
• Dry, rough skin
• More frequent infections

Toxicity: Why More Is Not Better

Because preformed vitamin A is stored in the liver, excessive intake over time can build up. The US tolerable upper intake level for adults is 3,000 mcg RAE per day of preformed vitamin A. Too much can cause:

• Headaches, nausea and dizziness
• Liver damage
• Reduced bone density and higher fracture risk with long-term high intake; see bone health awareness
• Birth defects when taken in high amounts during pregnancy

Beta-carotene from food does not cause vitamin A toxicity; the body converts only what it needs. Very high intakes may turn skin slightly orange (carotenaemia), which is harmless. However, high-dose beta-carotene supplements increased lung cancer risk in smokers in two large trials (ATBC and CARET), so smokers should avoid them.

Add Up Your Sources

If you take more than one supplement, the vitamin A can add up quickly. Common sources include:

• Cod liver oil and other fish liver oils
• Butter oil and liver-based supplements
• Multivitamins
• Eye health formulas
• Regular liver in the diet

Check labels and ask a pharmacist or doctor to review your total intake, especially if you are pregnant or planning pregnancy. Pregnant women are commonly advised to avoid liver and liver oils unless directed by their healthcare provider.

Vitamins A, D and K2 Work Together

These fat-soluble vitamins interact, particularly in bone and calcium metabolism. This is why traditional diets often paired them, as discussed in our vitamin K2 article and vitamin D guide.

A Balanced Vitamin A Plate

• Roasted sweet potato and carrots drizzled with olive oil
• Sautéed spinach or kale
• An egg or a portion of oily fish
• Mango or apricots for dessert

Frequently Asked Questions

Can vegetarians get enough vitamin A?

Yes. Colourful vegetables and fruits provide beta-carotene, and dairy and eggs provide retinol. Eating carotenoid-rich foods with a little fat improves absorption.

Is cod liver oil safe every day?

In label-recommended amounts, many adults use it safely. Add up vitamin A from all sources, and pregnant women should consult their healthcare provider first.

Does vitamin A help acne?

Prescription retinoids are effective acne treatments, but high-dose oral vitamin A supplements are not recommended for acne and can be harmful.

Which foods are richest in vitamin A?

Liver and fish liver oils are by far the richest sources of retinol. For beta-carotene, sweet potatoes, carrots, pumpkin and dark leafy greens lead the list.

The Takeaway

Vitamin A is essential for sight, immunity and skin. Most people can meet their needs with a mix of colourful vegetables and some animal foods. Use concentrated sources like liver and fish liver oils thoughtfully, add up your supplement totals, and take extra care during pregnancy.

Related Articles

• Iodine and Thyroid Health: What You Should Know
• Electrolytes and Hydration: A Practical Guide for Hot Days and Active People
• Sea Salt, Pink Salt, Black Salt or Table Salt? An Honest Comparison
• Fermented Cod Liver Oil
• Butter Oil and Vitamin K2

Disclaimer: This article is for general educational purposes only. These statements have not been evaluated by the Food and Drug Administration. Live Pine products are not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified healthcare professional before starting a new supplement, especially if you are pregnant, nursing, taking medication or managing a health condition.