Beta-carotene (or provitamin A) is an orange- pigmented terpene. It has beneficial effects in the fight against free radicals. Contrary to vitamin A, betacarotene can not be stored in the liver and beta-carotene excess is not toxic. During digestion, one part of beta-carotene is absorbed as- is and the other part is transformed into retinol (vitamin A) by the intestinal cells.