The statement "There are 23 known vitamins" is false. In reality, there are only 13 essential vitamins that are recognized by the scientific community. These essential vitamins include vitamin A, vitamin C, vitamin D, vitamin E, vitamin K, and the B vitamins (thiamine, riboflavin, niacin, pantothenic acid, biotin, vitamin B6, vitamin B12, and folate). While there are other compounds that may be referred to as vitamins by some, the commonly accepted number of essential vitamins is 13.