Deer Heart Blood is the blood drawn from the heart of sika deer slaughtered. The use of deer blood for fitness was first seen in the Song Dynasty "Qingbo Magazine", and until the Ming Dynasty Li Shizhen’s "Compendium of Materia Medica" made a detailed record of the medical effect of deer blood: "Maintain impotence, tonic deficiency, relieve low back pain, epistaxis, falls, rabies Injuries, taking with wine to treat pulmonary dysfunction, vomiting blood, and collapse in the middle, all people who are in danger of qi and pain can drink and heal. Great tonic deficiency, nourish essence and blood, relieve acne, poison and medicine." Lu Xinxue cures heart palpitations, insomnia, forgetfulness, falls, and anti-aging. It is used to treat rheumatism and rheumatoid disease with remarkable effect.