The relaxation response is a common term developed by Herbert Benson and he thought of it as an antagonistic of the fight or flight response (this one activated by the sympathetic system).

It has been recorded in several studies how Reiki activates the relaxation response. Cortisol is one of them. The commonly known as the stress hormone can be modulated when receiving Reiki.

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human frequencies energy level

Reiki and Cortisol

Even though the Relaxation Response is enhanced during a Reiki therapy, this doesn’t always mean a low cortisol level.
reiki science

Reiki Frequencies and Schumann Resonances

¿How does Reiki work? The scientific evidence suggests a tendency to believe that the channeling might have to do with low frequencies of the body.