What is NAN sensitive used for?

According to the Nestle NAN webpage, NAN OptiPro One contains an exclusive optimised protein blen called OPTIPRO, which provides babies with the right amount of proteins. It claims to help maintain a healthy digestive system during his first crucial year of life. As for NAN Sensitive, the name is pretty self-explanatory I feel. It is for babies with sensitive digestive system and helps with the management of infants aged 0-12 months with symptoms of lactose intolerance / maldigestion and diarrhea caused by lactose intolerance.