Vitamin should be noted that

In the vitamin discovery process, some compounds have been mistaken for vitamins, but does not meet the definition of vitamins, but also because of commercial interests, some compounds have been deliberately incorrectly named as vitamins:

Vitamin B family has some compounds have been considered vitamins, such as vitamin B4 (adenine), etc..

Vitamin F - was originally used to represent the body's own synthesis of essential fatty acids which can not, because the English name of fatty acid (Fatty Acid) to F at the beginning. But because it is actually constitute the main component of fat, while fat in the living body is also a source of energy, and the composition of cells, so vitamin F is not a vitamin.

Vitamin K - Ketamine as a sedative in some recreational drugs (Drugs), the composition was labeled vitamin K, but it is not really a vitamin K, which is known as "K it is fate."

Vitamin Q - Some experts believe that ubiquinone (Coenzyme Q10) should be viewed as a vitamin, in fact, a small amount of it can be synthesized by the body's own.

Vitamin S - Some people suggested that salicylic acid (o-hydroxy benzoic acid) is named Vitamin S (S is the first letter of salicylic acid Salicylic Acid).

Vitamin T - in a number of natural medicine, the information is used to refer to the material extracted from the sesame seeds, it does not have a single, fixed composition, it can not be a vitamin. And its functions and effects are no clear judgments. In some cases, vitamin T as testosterone (Testosterone) slang title.

Vitamin U - Some pharmaceutical companies use of vitamin U to refer to amino acids Met-chloride (Methylmethionine Sulfonium Chloride), which is a kind of anti-ulcer agents, mainly for the treatment of gastric ulcers and duodenal ulcers, it is not the human body essential nutrients.

Vitamin V - This is the treatment of ED drugs Viagra (Sildenafil Citrate, trade name: Viagra / Viagra / Viagra) oral title.

In real life, vitamin supplement is often used to signify the human body needs vitamins or other nutrients and trace elements of drugs or other products, such as the production of multi-dimensional elements in a lot of film makers will be labeled their products directly to vitamins.