Minecraft wiki entry for Healing, associated text: 1 Natural regeneration
1.1 Hunger
1.2 Saturation healing
1.3 Peaceful difficulty
2 Artificial regeneration
2.1 Potions
2.1.1 Potion of Healing
2.1.2 Potion of Regeneration
2.1.3 Tipped arrow
2.2 Golden apple
2.3 Totem of undying
2.4 Suspicious stew
2.5 Beacon
3 Mob healing
3.1 Potions
3.2 Regeneration
3.3 Spider
3.4 Villager
3.5 Iron golem
3.6 Witch
3.7 Feeding
3.8 Boss healing
3.8.1 Ender dragon
3.8.2 Wither
4 History