Cal. Food and Agricultural Code - FAC § 39841. Section 39841.
UHT flavored nonfat, skim, or fat-free milk is market milk from which has been removed all or part of the milk fat and to which has been added any harmless syrup or flavoring, harmless sweetening, and harmless edible stabilizer. It is homogenized and processed and packaged pursuant to Section 39701. The product may be called “UHT flavored nonfat milk,” “UHT flavored skim milk,” or “UHT flavored fat-free milk” and the principal flavor may be substituted for the word “flavored” in the name of the product.