In the average American diet, 93% of their vitamin C comes from fruits and vegetables and citrus fruits and tomatoes contribute to almost half of the vitamin C provided by the fruits and vegetable group. ... Collagen is a protein that gives structure to bones, cartilage, muscle and blood vessels. ... Vitamin C is active inside of the cell, where it adds hydrogen and oxygen to two amino acids, proline and lysine. ...

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• Grade Level: High School