As far as I know, and have read Carrots do help in keeping color. It will not turn an animal that doesn't have it in the genes orange though. Many other veggies can be used for this Carrots is one, an other is sweet potato, and butternut squash. Mostly veggies that are yellow, and orange in color. In one of the bearded dragon books I beleive it to be the Bearded Dragon Manual gives reference to Flamingos at a zoo that lost the pink color. They relized that the animals were not being fed food that they ate in the wild, it was beta Carrotine(sp)that was missing. After changing the diet to a more natural food for flamigos they regained the pink color. I do feed my dragons about two servings a week with sweet potato, and squash on top of there veggies. Two of the dragons I bought for color still have there orange, and yellow full body color. A normal that I feed the same diet does not show any more of these colors then any other normal. So I think the dragon has to have these colors to begin with.