All healers use life force or Ki, but not all use Reiki. Reiki is a special kind of life force that can only be channeled by someone that has been attuned to it. It is possible that some people are born with Reiki or have gotten it some other way. However, most healers who have not received the Reiki attunement from a Reiki Master are not using Reiki but another kind of life force. People who already do healing work consistently report an increase of at least fifty percent in the strength of their healing energies after taking the Reiki training.
This was verified for me when I first began teaching Reiki. There were two clairvoyant healers I knew who had highly developed abilities. They could easily see the life force flowing through a person's body, as well as see the aura and chakras. They could also communicate with a person's guides and Higher Self. They were adept at moving negative psychic energy out of the body as well as channeling healing energies. In my twenty years of metaphysical work, they were the most accurate and effective psychic healers I had met.
They told me later they had doubted there was anything I was teaching they couldn't already do, but that they took the Reiki training anyway, simply to support me in my new work. After the attunement, they were amazed at the difference they could feel between the healing energies they had been using and Reiki. They said the Reiki energies were more powerful and of a much higher frequency. They noted also that Reiki didn't have to be guided like the other healing energies they were using, and that the Reiki energies began flowing without having to enter an altered state. They also indicated the attunement process itself was a powerful healing experience, releasing restrictions relating to their healing work they had unknowingly acquired when they were healers in past lives. They were very pleased they had taken the class.
Reiki: The Healing Touch