Grapefruit was a 'horticultural accident', first discovered in the 1700s. Some say it's a cross between a Pomelo and a Sweet Orange, but no one knows exactly how it came about. Every part of the grapefruit can be used and eaten, and the peel is no exception. Naturally high in antioxidants, vitamin C and essential oils, it's considered an anti-aging ally and beauty elixir.