Growing is stressful for kittens, as they experience huge body changes in a short period of time. Also a kitten’s immune system is not yet fully developed, which can result in unbalanced intestinal micro-flora and tummy upsets. Good to know PURINA® vets and nutritionists have identified nutrients in food which can support kittens’ natural defences. The addition of bioactive ingredients – found in milk - has been shown to have an impact on kittens’ immune response. The bioactive nutrients in PRO PLAN® are called OPTISTART®. OPTISTART® is pro ven to help support kittens’ intestinal health and help reduce risk of upsets, by helping balance the intestinal flora and support intestinal defences. OPTISTART® is available in PRO PLAN® JUNIOR - a complete and balanced food, which supports the healthy development of kittens from 6 weeks to 1 year. PRO PLAN® JUNIOR contains the high levels of protein and fat needed to fuel your kitten’s growth. A blend of all essential nutrients including DHA also helps support the healthy development of the brain and vision.