Offal is a great choice of protein for its abundance of trace minerals. Many types of offal contain copper, chromium, and zinc. The body uses copper to form collagen, an important protein in various connective tissues. Collagen can help reduce joint pain, slow the aging process, and help build muscle. The mineral is also needed for the absorption of iron. Zinc aids the immune system, treating colds and various infections. Research shows zinc also supports cardiovascular and liver health, and fertility.

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