How to convert Retinol and Carotene to total Vitamin A

Vitamin A is measured using Retinol Equivalents (RE). The contribution of both retinol and beta-carotene is used to determine the total vitamin A content of a specific food.

Vitamin A can be calculated from its content of retinol and beta-carotene and its derivatives, based on the following formula:

total vitamin A (RE) = µg of retinol + ( µg of beta-carotene ÷ 6)

International Units (IU) were formerly used to express the vitamin A content of a food. To convert IU of vitamin A into Retinol Equivalents, the following formulae are used:

IU retinol÷3.33 = RE
IU beta-carotene ÷ 10 = RE

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s