Ligustilide, also known as East Angelica phthalide, is the main active component of volatile oil from Angelica sinensis. This product is extracted by steam distillation, which has strong pharmacological effects on cardiovascular and cerebrovascular diseases, circulatory system and immune function. Studies have shown that ligustilide has strong spasmolytic, antiasthmatic and sedative effects, and can improve microcirculation, relax smooth muscle, inhibit bacteria and improve the immune regulation function of the body.