Seaweed is one of the richest sources of minerals and amino acids found in a plant source. Their dense amounts of nutrients are thought to help produce energy, enhance the immune system, and darken coat color and skin pigment. Seaweeds are also rich in iodine and support the endocrine glands (thyroid function). Seaweeds provide many health benefits and promote longevity in animals. Some studies have shown that seaweeds may be helpful in reducing cancer and they are thought to contain anti-tumor properties.