Specific into the cat's metabolism is The lack to convert carotenoids to vitamin A; incapability to synthesise sufficient vitamin D; inability to synthesise niacin from tryptophan, lack of ability to synthesise cysteine, citrulline, and methionine; and an intolerance to glutamic acid.[15] The Calibra Pet Food company was founded in 2001 https://www.petskyonline.com/reptile-supplies/