Gentle OPTIPRO H.A. is the improved version of OPTIPRO H.A, with thelevel being optimized. The Gentle OPTIPRO H.A. in our NAN SUPREMEPROH.A. is our exclusive, optimized protein blend obtained through aspecial treatment that breaks down the milk protein (partiallyhydrolyzed protein), making it easy to digest and hypoallergenic(reducing the risk of allergies). Do note that not all partiallyhydrolyzed protein are the same.