Magnetite, also known as Ci Shi in Chinese, is a substance that is used in traditional Chinese medicine to calm the mind and quiet the spirit. It is associated with the Liver and Kidney meridians and has a spicy and salty taste. Magnetite is considered to be cold in temperature and is thought to have several health benefits, including improving hearing and vision, and helping the kidneys to function properly. However, it should be avoided if you have weakness in your Spleen and Stomach. The recommended dosage is 15-30 grams.