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“The addition of xanthophyll apparently decreased the gastro-intestinal destruction of carotene , vitamin A alcohol, and vitamin A acetate and, thus, enhanced the response to the 3 vitamin A sources at the levels fed.”
Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine • 1947 | View Paper
“Surprisingly, administration of 1,000 or 2,000 ppm of β‐carotene and lutein increased colonic ACF formation in a dose‐dependent manner, i.e., to 124% and 144% for the former and 110% and 159% for the latter.”