5D Retrievers does not require you to purchase the vitamin supplements, with the exception being, for the purpose of maintaining the hip guarantee. Why, you ask?... Because hip dysplasia has been proven to be polygenic disorder influenced by environmental factors, nutrition is the only factor we can assist with once the puppy leaves our facility. 5D Retrievers has no control over the dog food brand you choose for your puppy, this is why we recommend supplementing with NuVet Plus supplement to ensure your puppy has the building blocks to support adequate growth.