In addition to lutein, our Multivitamin OPTIMUM also contains beta-carotene, a nutrient belonging to the bioactive group of substances called carotenoids. Carotenoids are important natural colouring agents responsible for the orange, red and yellow colour of fruit and vegetables. There are many carotenoids and they all have unique properties that are useful for the body. Beta-carotene is also called provitamin A. Beta-carotene has an important modulating function when it comes to vitamin A. Our bodies can convert beta-carotene to vitamin A as needed and will never convert more beta-carotene to vitamin A than it needs. This means that no inconveniences can arise from an overdose of vitamin A, because the absorption in the gut, and conversion of beta-carotene to vitamin A, is automatically slowed down when the body does not need vitamin A. This makes beta-carotene a safe alternative to standard vitamin A.