User blog comment:MaaZDS/Zombie Villager not curing/@comment-28905095-20170226093714

Which potions and apple did you use?

The correct combination should be a Potion of Weakness, and an ordinary Golden Apple. Not potion of Slowness, nor Enchanted Golden apples.

This combination worked for me, when I did it on a trapped Zombie Villager in an Igloo! Very nice to have him in a cage, when doing this stuff.