ISO 20633:2015规定了同时定量测定存在于所有形式的婴儿和成人配方食品(粉末、即食液体和液体浓缩物)中的维生素E(α-生育酚和α-生育酚乙酸酯)和维生素A(棕榈酸视黄酯和乙酸视黄酯的13-顺式和全反式异构体)的方法。 视黄醇不用于强化目的，因此在该方法中未涉及。产品中的先天量是微不足道的。 维生素E的立体异构体α-生育酚和α-生育酚乙酸酯在该方法中未被区分。

ISO 20633:2015 specifies a method for the simultaneous quantitative determination of vitamin E (α-tocopherol and α-tocopheryl acetate) and vitamin A (13-cis and all-trans isomers of retinyl palmitate and retinyl acetate) present in all forms of infant and adult formulas (powders, ready-to-feed liquids and liquid concentrates). Retinol is not used for fortification purposes and therefore is not addressed in this method. The innate amount in products is insignificant. Stereoisomers of vitamin E, α-tocopherol and α-tocopheryl acetate, are not differentiated in this method.