... after he crystallized this compound from carrot roots. Beta-carotene is a member of the carotenoids, which are highly ... squash, spinach, apricots, and green peppers). Alpha, beta, and gamma carotene are considered provitamins because they can be converted to active ... of the eye), and ultimately death. Commercially available beta-carotene is produced synthetically or from palm oil, algae, or ...