User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/Engorgio/@comment-176.250.227.47-20120526182658

ron says that he thought hargid had got in the way of an engorgment charm when he was a kid (when they found out hagrid was a gient) in the goblet of fire. that would suggest that it can be used on humans