An organic chemical compound (or related set of compounds) is called a vitamin when the organism cannot synthesize the compound in sufficient quantities, and must be obtained through the diet; thus, the term "vitamin" is conditional upon the circumstances and the particular organism.. 
Ọ̀kan lára àwọn àìsàn kan tí a mọ̀ sí àwọn àrùn tí a kọ́ kàsí ni ilẹ̀-olóoruní i ṣe.Àwọn àtòkasi.. 