Cal. Health & Saf. Code § 1209
This chapter does not authorize any person other than a licensed practitioner of a healing art, or any corporation except charitable or professional corporations as expressly provided in this chapter, to furnish to any person any advice, services, or treatment within the scope of such professional licensure.
This chapter does not authorize any person, other than a licentiate of a healing art acting within the scope of his or her license, to engage directly or indirectly in the practice of medicine and surgery, dentistry, optometry, podiatry, psychology, or pharmacy.
This chapter does not regulate, govern, or affect in any manner the practice of medicine and surgery, pharmacy, dentistry, optometry, chiropractic, podiatry, psychology, or drugless healing by any person duly licensed to engage in such practice.
Ca. Health and Saf. Code § 1209