Vitamin A


In the human diet, vitamin A is in the form of retinol and its esters, present only in animal products, and the form of provitamin carotenoids, mainly of plant origin.

In Nutritiomètre ®, it is followed that includes retinol equivalent these two forms, taking into account that β-carotene vitamin activity 6 times lower than that of retinol.

Vitamin A has a role in vision and is involved in the biochemistry of phototransduction and is the prosthetic group of retinal purple, which is the pigment in the rod cells of the pigment epithelium of the retina.

Sources of Vitamin A (Retinol Equivalent)

See the list of foods that provide the most Retinol and β-carotene


The 100% value in the ANC Nutritiomètre ® is 800 mcg per day adult men and 600 micrograms per day in adult women.

Studies tend to settle at 3000 mcg retinol equivalent threshold beyond which vitamin A may be teratogenic. A safety limit has been set at 1000 mcg retinol equivalent, beyond the recommended dietary allowances (we retain the value of 250% in the Nutrimeter ®).

(Source: "Recommended dietary allowances for the French population," the CNERNA-CNRS. Edition coordinated by Ambroise Martin.)