Exclusive to the cat's metabolism is The shortcoming to transform carotenoids to vitamin A; incapacity to synthesise adequate vitamin D; incapability to synthesise niacin from tryptophan, incapacity to synthesise cysteine, citrulline, and methionine; and an intolerance to glutamic acid.[15] of details about what your cat really requires from their diet, https://www.petskyonline.com/small-pets/