Vitamin C is a water-soluble antioxidant. It is a key ingredient for tissue growth and immune system functionality (protecting against the common cold). This vitamin is one of the many nutrients that the body cannot produce on its own, but is essential for its ability to aid in forming proteins that are needed to make skin, tendons, ligaments and blood vessels. Through this process, the vitamin C helps heal/protect the body from both physical injury and illness.
Insufficient Vitamin C can lead to anemia, slowed metabolism, decreased ability to fight infections and more.
Over-consumption can result in upset stomach and diarrhea.
Fruits and vegetables usually provide this vitamin, especially: oranges, grapefruit, watermelon, mango, broccoli, peppers, spinach, potatoes, tomatoes, and more.
Dosages can be ingested at amounts between 100mg to 1,000mg daily.
National Institutes of Health - https://www.nlm.nih.gov/medlineplus/ency/article/002404.htm