beta-carotene

Carrots contain beta-Carotene (bet you can't guess the etymology.) Beta-Carotene gets metabolized into various forms of vitamin A, including retinal, which is necessary for eye health.

Art explained that it was the grass diet that gave the eggs their color, indicating lots of beta-carotene.

There is only one difference between normal rice and Golden Rice and that is the presence of beta-carotene in the grain.

All the referenced studies (none of them are behind a paywall): The Beta-Carotene and Retinol Efficacy Trial: incidence of lung cancer and cardiovascular disease mortality during 6-year follow-up after stopping beta-carotene and retinol supplements.

Rice leaves are already full of beta-carotene but are inedible.

We see negative health outcomes from substances such as beta-carotene, vitamin E, and folic acid in supplemental form [2], while high levels in whole foods demonstrate no such harms.

That said, here's some analysis of his sources: Most of the articles he (doesn't) link to are about harmful effects of beta-carotene and vitamin A, which coincidentally turn out to be mostly the same thing, just in a different form.

Checking out the one article I found [1], they gave 30mg of beta-carotene (16K UI), and 25000 UI of retinyl palmitate, which converts to a total of 41000UI of vitamin-A, or 800% of the recommended daily dosage.

One example 'The appendix of the FSA report shows that some nutrients, such as beta-carotene, are as much as 53% higher in organic food, but such differences are not reflected in its conclusions.' I suggest that if you are going to attempt to wield the sword of 'scientific proof' you should at least have some understanding of how it works.

Ingredients: Non-GMO Expeller Pressed Canola Oil, Filtered Water, Lemon Juice, White Vinegar, 2% or less of the following: Organic Sugar, Salt, Pea Protein, Spices, Modified Food Starch, Beta-Carotene.

On the other, as far as I can tell from a small amount of reading, Bt corn, "golden rice" (rice that makes its own beta-carotene), the non-browning apple, and now this Bt eggplant are all probably okay.

"Based on properly designed and conducted randomised clinical trials, convincing evidence that beta-carotene, vitamin A, vitamin C, and vitamin E or their combinations may prevent gastrointestinal cancers is not found [...] These antioxidant supplements even seem to increase mortality." Here's the study for lung cancer.