Carrots contain beta-carotene, whereas liver contains preformed vitamin A. Both contribute to vitamin A intake, but they are not the same. When comparing foods or supplements, distinguish retinol from provitamin A. This is especially important during pregnancy and when considering high-dose supplements. [1]
Retinol and beta-carotene: what is the difference?
Preformed vitamin A is mainly found in animal foods. Certain plant carotenoids, including beta-carotene, can be converted to vitamin A in the body. The amount made available depends partly on food structure, preparation and individual absorption. A plant pigment's milligram amount is therefore not equivalent to the same amount of retinol. [1]
Which foods are suitable sources?
| Food | Predominant form | Practical perspective |
|---|---|---|
| Carrots, sweet potatoes and pumpkin | Provitamin A carotenoids | Use as a vegetable side dish, soup or part of a complete meal. |
| Spinach and other dark green vegetables | Provitamin A carotenoids | Green colour does not rule out a contribution to vitamin A intake. |
| Eggs and dairy products | Preformed vitamin A | Can contribute within a mixed diet. |
| Liver and liver products | High in preformed vitamin A | Not a daily optimisation target; particular caution is needed during pregnancy. |
This overview does not replace a nutrient calculation. Variety, portion and preparation change a meal's contribution. One vitamin-rich food does not automatically balance an otherwise restricted diet. [1] [2]
How much vitamin A is needed?
For adults aged 19 to under 65, the German Nutrition Society (DGE) gives daily reference intakes of 700 µg retinol activity equivalents for women and 850 µg for men. Values can differ at other ages and life stages. Retinol activity equivalents, abbreviated RAE, allow different sources to be compared: 1 µg RAE equals 1 µg of retinol or 12 µg of beta-carotene from foods. [2]
A clearly hypothetical calculation: 3,600 µg of beta-carotene in a food portion corresponds to 300 µg RAE. This explains the unit; it is not a measurement of an individual's absorption or a recommended supplement serving.
Making carotenoid-rich meals practical
Some fat in a meal can improve absorption of fat-soluble carotenoids. Vegetables do not need to be drenched in oil. Examples include carrots with a suitable dressing, pumpkin soup with a small fat component, or spinach as part of an ordinary meal. Chopping and appropriate preparation can also affect availability. [1] [2]
Try alternating orange and green vegetables throughout the week. This provides more variety than relying on a daily juice as a supposed complete solution. Keep protein sources, whole grains and other food groups in the overall plan too.
Why liver and high-dose supplements need special care
Too much preformed vitamin A can be harmful. Excessive retinol intake is particularly problematic during pregnancy. Because of its high content, the DGE advises against eating liver regularly or in large amounts, especially in the first trimester. Vitamin A supplements and cod liver oil should not be added independently as preventive measures in this situation. [1] [2]
High-dose beta-carotene supplements are not equivalent to vegetables either. Large studies found risks from particular high-dose regimens in groups who smoked or had been exposed to asbestos. This is not a reason to avoid carrots or leafy greens; it argues against automatically transferring the roles of food nutrients to high-dose products. [1]
What a product label should make clear
Check the vitamin A form, amount in the actual daily serving and any other supplements used. A multivitamin and an additional oil product may both provide vitamin A. Milligrams, micrograms and international units should not be added without checking their basis. If anything is unclear, review it with a pharmacist rather than estimating from the front of the pack.
Frequently asked questions
Do only orange plants contain provitamin A?
No. Dark leafy greens can also provide relevant carotenoids. [1]
Will extra carrots improve every eyesight problem?
No. Vitamin A is needed for normal vision, but an existing refractive problem is not automatically corrected by it. New visual symptoms need assessment. [1]
Can vitamin A intake be planned through plant foods?
Yes, through suitable provitamin A sources. Actual food intake and individual absorption conditions still matter.
Are retinol and beta-carotene interchangeable on a label?
No. The form and reference unit must be appropriate for the comparison.
Conclusion
Everyday priorities are varied foods and understandable quantities. Distinguish preformed vitamin A from plant-based provitamin A, and do not treat high-dose supplements like an extra serving of vegetables.
Read more: Vitamin E: foods and daily intake and Planning nutrients on a vegan diet.
Sources
- NIH ODS: Vitamin A and Carotenoids – Health Professional Fact Sheet
- DGE: Vitamin A reference values and guidance (German)
Editorially revised: 26 September 2026. General information for adults, not individual diagnosis or treatment. Natur Total also operates a food supplement shop. The reference intakes quoted are the German DGE values.
