Cal. Food and Agricultural Code - FAC § 38701. Section 38701.
Sour cream dressing is a product which is made from pasteurized market cream, with added milk solids derived from market milk, to which any strain, or two or more strains, of lactic acid producing organisms has been added to give it a distinct lactic acid flavor. It shall contain not less than 16 percent of milk fat and not less than 24 percent of total milk solids. It may contain salt and harmless edible stabilizers, emulsifiers, and coagulating enzymes as specified in Title 21 of the Code of Federal Regulations.