Cal. Bus. & Prof. Code § 2068
This chapter shall not be construed to prohibit any person from providing nutritional advice or giving advice concerning proper nutrition. However, this section confers no authority to practice medicine or surgery or to undertake the prevention, treatment, or cure of disease, pain, injury, deformity, or physical or mental conditions or to state that any product might cure any disease, disorder, or condition in violation of any provision of law.
For purposes of this section the terms "providing nutritional advice or giving advice concerning proper nutrition" means the giving of information as to the use and role of food and food ingredients, including dietary supplements.
Any person in commercial practice providing nutritional advice or giving advice concerning proper nutrition shall post in an easily visible and prominent place the following statement in his or her place of business:
"NOTICE"
"State law allows any person to provide nutritional advice or give advice concerning proper nutrition-which is the giving of advice as to the role of food and food ingredients, including dietary supplements. This state law does NOT confer authority to practice medicine or to undertake the diagnosis, prevention, treatment, or cure of any disease, pain, deformity, injury, or physical or mental condition and specifically does not authorize any person other than one who is a licensed health practitioner to state that any product might cure any disease, disorder, or condition."
The notice required by this section shall not be smaller than 81/2 inches by 11 inches and shall be legibly printed with lettering no smaller than1/2 inch in length, except the lettering of the word "NOTICE" shall not be smaller than 1 inch in length.
Ca. Bus. and Prof'l. Code § 2068