Nutrients in Vitalixir PLUS are at optimal levels that have proven efficacy, where peer review studies exist. The nutritional balance of Vitalixir PLUS has been carefully formulated taking into account: an average pet diet, ingredients that are endorsed by the APVMA as having proven efficacy or positive benefits on hip and joint conditions, and the AAFCO and FEDIAF standards for daily nutrient requirements for dogs and cats. Unlike other products on the market, the formula has been developed to ensure that your pet gets complete daily nutrition when Vitalixir PLUS is added to your pet's normal food in addition to supporting hip and joint conditions.