From Consumer Wiki
Hypnotists are not licensed or regulated by any state agency. Once under the jurisdiction of the Board of Behavioral Sciences, (State of California Department of Consumer Affairs), this field was deregulated in 1991. Hypnotists may apply to various private entities to acquire some sort of registration or certification.
Hypnotherapy, the use of hypnosis for behavioral changes, is a non-licensed profession in the state of California. Complaints about a hypnotherapist are a civil matter. However, if the hypnotherapist is licensed as an MFCC, LCSW, or psychologist the consumers should contact those boards.