Non-vitamins / non-vitamins
A range of substances that are said to have vitamin-like effects, but which are not normally essential or whose endogenous synthesis normally fulfils the requirement under normal circumstances.
Not present in the human organism:
Bioflavonoids (vitamin P), orotic acid (vitamin B13), pangamic acid (vitamin B15), laetrile (vitamin B17)
Normally sufficient self-synthesis:
Choline, inositol, carnitine (vitamin Br), methylmethionine sulphonium chloride (vitamin U), ubiquinone / coenzyme Q, α-lipoic acid