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Introduction of retinoids
In addition to the 14 other vitamins discussed, there are still some substances that cannot fully prove from the current research materials that they are vitamins, but have vitamin properties to varying degrees. One class of substances has been shown to have vitamin biological effects in certain aspects, and a few animals must be provided by diets, but it has not been demonstrated that most animals must be provided by diets. Among the retinoids belonging to this category are inositol, carnitine, lipoic acid, coenzyme Q and polyphenols. There is also a class of substances that have an effect on the metabolism of animals or a benefit, but have not yet been proven on which animal must be provided by the diet. This group of substances includes "vitamin B13 (orotate)", "vitamin B15 (Pangamic acid)" "vitamin B17 (latrymyromycin)", "vitamin H3 (Gerovital)" "vitamin U" and "glucose tolerance factor "Because the latter category cannot be determined to be necessary for animals, it is also called pseudo-vitamin." The question of whether these substances are vitamins remains to be further evidenced, as well as the further clarification of the concept and definition of vitamins.