Ascorbic Acid. You have to get what you need from food, including citrus. Ascorbic acid is commonly found in citrus fruit (such as oranges), tomatoes, brussels sprouts, cauliflower, and broccoli, among others.
Ascorbic acid, as vitamin c, was the topic of much controversy in the 1970s. Vitamin c (ascorbic acid) is a nutrient your body needs to form blood vessels, cartilage, muscle and collagen in bones.