Vitamin C (absorbic acid) is found in many natural fruits and vegetables such as green leaf vegetables, broccoli, green peppers, carrots, bean sprouts, tomatoes, mango, papayas, strawberries, lemons, limes, and other citrus fruits.
 
Your body requires Vitamin C in order to produce collagen, which is found in your skin, bones, cartilage, ligaments, tendons, and blood vessels. It also serves as a detoxifier to reduce toxic chemicals from your body. Without Vitamin C, people are susceptible to many diseases from the common cold to scurvy, which will result in death if it is not treated. Eating fruits and vegetables helps your body grow and repair and even prevents signs of aging by helping to keep skin firm. 

Vitamin D helps keep your bones healthy by helping your body absorb the calcium in your diet. It helps prevent rickets in children. 
 
Fish and egg yolks are two of the few natural foods containing Vitamin D, however eating these is not enough. In order for the body to use the vitamin, it requires the help of the sun. The sun turns chemicals in your skin into Vitamin D3, which is carried to your liver and kidneys, where it is transformed into active Vitamin D. 

Vitamin K (naphthoquinoids) is produced by the body and is responsible for blood clotting. After you’ve been cut, it works to stop you from losing too much blood. Taking antibiotics can cause deficiencies in Vitamin K but you can rely on green leaf vegetables to replenish your supply.

Zinc is good for reducing inflammation, boosting the immune system, and facilitating healing. It can help treat or prevent acne and enables quicker recovery from the common cold. It can reduce the symptoms of diarrhea and help prevent or slow age-related diseases such as macular degeneration. Topically, it is used in ointments to treat diaper rash and sunburn. Too much zinc, however, can lead to a deficiency in copper, which could result in neurological issues.