Kiwifruit pulp contains carotenoids, such as provitamin A beta-carotene, lutein and zeaxanthin. When eaten, beta-carotene is a provitamin, converted to retinol (vitamin A). Tempeh contains ergosterol (provitamin D2). The oil contains provitamin A (mostly beta-Carotene). Menadione is a synthetic provitamin of vitamin K. A provitamin is a substance that may be converted within the body to a vitamin. An early issue was that golden rice originally did not have sufficient provitamin A content.