Guangyu Yuanangong Niuhuang Pill is used for health preservation in solar terms, mainly in the four solar terms of Jing-Zhe, Summer Solstice, First Frost and Winter Solstice. These four solar terms are either cold to hot or cold and warm alternately, so they have a great influence on the body. Taking Angong Niuhuang Pill in these solar terms can clear phlegm, soften blood vessels and prevent cardiovascular and cerebrovascular diseases.