Interesting information about vitamin C.
Vitamin C is a vitamin for humans, birds, primates, most fishes, guinea pig, and invertebrates. Dehydroascorbic acid and ascorbic acid have vitamin activity.
Scurvy via Wikipedia
Skin changes, gum decay, bone fracture, tooth loss, fragility of blood capillaries are signs of vitamin C deficiency, vitamin deficiency causes scurvy.
Chemical structure of ascorbic acid via Wikipedia
Intake of vitamin C enhances the absorption of iron, and this depends on the presence of the vitamin in the gut. At intakes above about 100 mg / day of vitamin C is saturated, and any further intake is excreted in the urine. Vitamin C may reduce the duration and severity of symptoms in the common cold. Therefore vitamin C is very important and valuable.