How can I understand vitamin A content in foods?

As you know, there are multiple forms of vitamin A, including retinol and beta-carotene.

And the amount of vitamin A may be written using different units. Often this is mcg per 100 grams of food but, you may also see IU (International Units) sometimes.

The estimation that 800mcg = 2400 IU is based on a variety of "common factors" and should be treated as any estimation would - with extreme caution and awareness that this estimation is a pure generalisation of a matter. Think of it as guidelines more than as a framework (or rule for that matter).

The form of the vitamin A which is mostly always in question when it comes to these types estimations is retinol.

However, due to the specific needs of each individual and mandatory requirement for personalization upon dealing with personal recommendations the scientific community is planning on the phasing out the international measurements (IU) mentioned above.

In general, upon advising a client, you would want to include a specific form of vitamin A in the equation.
Provitamin A, including beta-carotene, are found in vegetables, fruits, and plant-based products. Also,

Previtamin A, including retinyl palmitate and retinol, are found in animal sources.

There are many sources online which can help you to examine the nutrient content of certain foods. But when you look at these sites, may sure that you understand the units they are using, the type of vitamin, whether is takes into account cooking methods, and how portion sizes are measured.

Updated on: 27/10/2026