Cacao is rich in essential minerals, including magnesium, calcium, iron, zinc, potassium and phosphorus. This ancient superfood is rich in antioxidants as well; Cacao beans contain 10,000 milligrams (10 grams) per 100 grams of flavonol antioxidants. This is a whopping 10% antioxidant concentration level! This makes cacao one of the richest sources of antioxidants of any food.