Our kitten supplement was designed to be used with our MATURE line of foods for households that have both kittens and mature cats. We want our mature cats to consume lower levels of minerals to protect their kidneys, however, kittens that are still growing bone need those minerals for continued growth. With our Kitten Supplement, you can add the necessary minerals to canned, soft food while feeding the mature food as the general household diet. This Kitten Supplement should never be used with our 50/22 or our standard ZERO formula as they already have a full compliment of minerals, adding extra can compromise your cats health.