Capsanthin

You can also check product ingredient lists for beet, carotenes, annatto, capsanthin (a paprika extract) -- as all are natural colorants. ❋ EatingWell (2010)

These pigments absorb blue and green wavelengths and are responsible for most of the yellow and orange colors in fruits and vegetables (beta-carotene, xanthophylls, zeaxanthin), as well as the red of tomatoes, watermelons, and chillis (lycopene, capsanthin, and capsorubin; most red colors in plants are caused by anthocyanins). ❋ Harold McGee (2004)

In red varieties, both lutein and the green aroma disappear during ripening along with chlorophyll, and other carotenoid pigments accumulate, the main ones being capsanthin, capsorubin, as well as beta-carotene, the precursor of vitamin A. ❋ Harold McGee (2004)

The reason, La Puma said, is that the oil makes several nutrients - the lutein in the green peppers, the capsanthin in the red peppers, the lycopene in the tomatoes, even the limonene in the lemon - more body ready for you.