NAN is an infant formula that is made by Nestle, the company that also makes Good Start Essentials and Good Start Supreme formula. It is marketed primarily in Latin America.
In addition to having a different name, it is made with a different mix of milk proteins. Instead of the 100% whey “comfort proteins” found in Good Start Supreme, NAN is made with a combination of whey and casein milk proteins. It is basically the same as the older Good Start Essentials line of baby formula made by Nestle.