Beta carotene is a precursor the body can convert to vitamin A. Unfortunately, as a supplement, synthetic beta carotene is usually “stabilized” in refined vegetable oils. In this trans fatty acid form, oxidation occurs and the chemically “pure” beta carotene can no longer act as a nutrient, because it was changed. Almost all synthetic beta carotene is produced by the Swiss drug giant Hoffman-LaRoche.
This form can no longer be converted to vitamin A. The best it can be is worthless, and at the worst is toxic.
