21 CFR § 169.180 - Vanilla-vanillin extract.
(a) Vanilla-vanillin extract conforms to the definition and standard of identity and is subject to any requirement for label statement of ingredients prescribed for vanilla extract by § 169.175, except that for each unit of vanilla constituent, as defined in § 169.3(c), contained therein, the article also contains not more than 1 ounce of added vanillin.
(b) The specified name of the food is “Vanilla-vanillin extract _-fold” or “_-fold vanilla-vanillin extract”, followed immediately by the statement “contains vanillin, an artificial flavor (or flavoring)”. The blank in the name is filled in with the whole number (disregarding fractions) expressing the sum of the number of units of vanilla constituent plus the number of ounces of added vanillin per gallon of the article. However, if the strength of the article is less than 2-fold, the term “_-fold” is omitted from the name.