When you have someone who can weave spirit and matter together along with being able to communicate with divinity you have created alchemical healing. Being able to do things like that gives you influence over the body and the mind. You can give a transformation of healing. The reason you can do this is that you have an extreme psychic ability in the way it interacts with the body.
While much of this is science a lot of is has to do with the magical realms in which magic exists. The transformation is bringing it out of those realms into the human realm. This is what alchemical healing really is. It is a blend of the magical and the here and now. The magic weaves itself into your mind allowing you to heal. This is one of the best healing magic short of miracle pieces.