<unk> , including subclinical<unk> , is caused by a deficiency of dietary vitamin C since humans are unable to metabolically synthesize vitamin C. Provided the diet contains sufficient vitamin C, the lack of working L-gulonolactone oxidase (GULO) enzyme has no significance, and in modern Western societies,<unk>  is rarely present in adults, although infants and elderly people are affected. Virtually all commercially available baby formulas contain added vitamin C, preventing infantile<unk> . Human breast milk contains sufficient vitamin C, if the mother has an adequate intake. Commercial milk is pasteurized, a heating process that destroys the natural vitamin C content of the milk.<unk>  is one of the accompanying diseases of malnutrition (other such micronutrient deficiencies are beriberi and pellagra) and thus is still widespread in areas of the world depending on external food aid. Although rare, there are also documented cases of<unk>  due to poor dietary choices by people living in industrialized nations.
Scurvy
Rickets
Hemosiderinuria
Pseudoporphyria
Harderoporphyria
Porphyria
Keratoglobus
Basophilia