Translations:B vitamins/18/en

Related compounds

Many of the following substances have been referred to as vitamins as they were once believed to be vitamins. They are no longer considered as such, and the numbers that were assigned to them now form the "gaps" in the true series of B-complex vitamins described above (for example, there is no vitamin B₄). Some of them, though not essential to humans, are essential in the diets of other organisms; others have no known nutritional value and may even be toxic under certain conditions.

• Vitamin B₄: can refer to the distinct chemicals choline, adenine, or carnitine.
  • Choline is synthesized by the human body, but not sufficiently to maintain good health, and is now considered an essential dietary nutrient.
  • Adenine is a nucleobase synthesized by the human body.
  • Carnitine is an essential dietary nutrient for certain worms, but not for humans.
• Vitamin B₈: adenosine monophosphate (AMP), also known as adenylic acid. Vitamin B₈ may also refer to inositol.
• Vitamin B₁₀: para-aminobenzoic acid (pABA or PABA), a chemical component of the folate molecule produced by plants and bacteria, and found in many foods. It is best known as a UV-blocking sunscreen applied to the skin, and is sometimes taken orally for certain medical conditions.
• Vitamin B₁₁: pteroylheptaglutamic acid (PHGA; chick growth factor). Vitamin Bc-conjugate was also found to be identical to PHGA. Derivative of folate ("pteroylmonoglutamic acid" in this nomenclature).
• Vitamin B₁₃: orotic acid.
• Vitamin B₁₄: cell proliferant, anti-anemia, rat growth factor, and antitumor pterin phosphate, named by Earl R. Norris. Isolated from human urine at 0.33ppm (later in blood), but later abandoned by him as further evidence did not confirm this. He also claimed this was not xanthopterin.
• Vitamin B₁₅: pangamic acid, also known as pangamate. Promoted in various forms as a dietary supplement and drug; considered unsafe and subject to seizure by the US Food and Drug Administration.
• Vitamin B₁₆: dimethylglycine (DMG) is synthesized by the human body from choline.
• Vitamin B₁₇: pseudoscientific name for the poisonous compound amygdalin, also known as the equally pseudoscientific name "nitrilosides" despite the fact that it is a single compound. Amygdalin can be found in various plants, but is most commonly extracted from apricot pits and other similar fruit kernels. Amygdalin is hydrolyzed by various intestinal enzymes to form, among other things, hydrogen cyanide, which is toxic to human beings when exposed to a high enough dosage. Some proponents claim that amygdalin is effective in cancer treatment and prevention, despite its toxicity and a lack of scientific evidence.
• Vitamin B₂₀: L-carnitine.
• Vitamin B_f: carnitine.
• Vitamin B_m: myo-inositol, also called "mouse antialopaecia factor".
• Vitamin B_p: "antiperosis factor", which prevents perosis, a leg disorder, in chicks; can be replaced by choline and manganese salts.
• Vitamin B_T: carnitine.
• Vitamin B_v: a type of B₆ other than pyridoxine.
• Vitamin B_W: a type of biotin other than d-biotin.
• Vitamin B_x: an alternative name for both pABA (see vitamin B₁₀) and pantothenic acid.