Cal. Food & Agric. Code § 38651

Flavored milk is market milk to which has been added a stabilizer, sugar, syrup, or flavor made from wholesome ingredients. Flavored milk may be sold as flavored milk, flavored reduced-fat milk, flavored lowfat or light (lite) milk, flavored high nutrient lowfat milk, and flavored nonfat skim or fat-free milk. Flavored milk shall be labeled with the name of the product. The principal flavor may be substituted for the word “flavored” in the name of the product as, for example, “chocolate nonfat milk” in substitution for “flavored nonfat milk.” Flavored milk shall be so colored or contain ingredients that cause it to differ distinctly from milk in appearance and other characteristics.