Cal. Health & Safety Code § 111340
Any drug or device is misbranded unless it bears a label containing all of the following information:
(b) An accurate statement of the quantity of the contents in terms of weight, measure, or numerical count.
Reasonable variations from the requirements of subdivision (b) shall be permitted. Requirements for placement and prominence of the information and exemptions as to small packages shall be established in accordance with regulations adopted pursuant to Section 110380.