Garlic is rich in folic acid, vitamin C, calcium, iron, magnesium, potassium and a small amount of zinc and vitamins B1, B2 and B3. Garlic is a strong natural antibiotic, anti-fungal and anti-viral that improves the health of the body. Sulfur compound of garlic, known as allicin, strengthens the body's immune system and acts as a natural antibiotic.