In the fourteenth century and before that Scurvy had long been a principal killer of sailors during the long sea voyages. In the 1497 expedition of Vasco De Gamma, the curative effects of citrus fruit were known and they used to take tea infused with evergreen needles to treat scurvy, a deadly disease happens due to lack of Vitamin C. Symptoms are malaise and lethargy, progressing to shortness of breath, bone pain, bleeding gums, susceptibility to bruising, poor wound healing, and finally fever, convulsions and eventual death. Apart from scurvy, the Vitamin has several important roles in our body.
Chemical Name: Ascorbic acid and L-ascorbic acid
Responsible For: Prevention and treatment scurvy, Good immunity to Cold and other infectious diseases, Help to absorb iron, Reduce risk of cardiovascular disease, reduce the risk of cancer, act as a strong water-soluble antioxidant.
Side Effect: Overdose of the vitamin may cause indigestion, particularly when taken on an empty stomach. For large dose include nausea, abdominal cramps, and diarrhea.
Requirements: As per US guidelines Adult male requires 90 mg / day and adult female requires 75 mg per day.
Source: Vitamin C is mainly sourced from the plant. Papaya, Bell Peppers, Pineapple, Orange, Mango, Carrot, apple, Guava, watermelon, etc.
Precaution: Fresh plant should be used otherwise it decomposes if comes in contact with air for a long time. Vitamin C decomposes if heated. Use of copper utensil to store Vitamin C enriched food items catalyzes the decomposition.
Source: Wikipedia and other.