Humans cannot synthesize vitamin C for themselves. Therefore they must be eating fruits and vegetables, so the body gets vitamin c. vitamin c deficiency protection. Vitamin C helps in the resistance to heart disease. Antioxidants help prevent cataracts and also help with memories, too. We can find vitamin c in fruits, vegetables, citrus, lemon fresh potatoes, green, etc. The source of this is why we usually understand that lemon citrus, then there are high in vitamin c.