When choosing Yunnan comfrey, it is best to choose some thick and sturdy ones with thicker skin, purple color, and hard texture with a smaller wooden heart.

Schisandra​ is a fruit with five medicinal properties of pungent, sweet, sour, bitter and salty. It is unique among Chinese herbal medicines that generally only have one or two medicinal flavors.

Dried ginger is the finished product of fresh ginger that is harvested in winter to remove the roots, sediment and then sun-dried or low-temperature drying. It is used by traditional Chinese medicine to treat diseases. It is also known as white ginger, Junjiang, and Qiansheng ginger.

Polygala is a commonly used traditional Chinese medicine. Polygala added with honey is also called Miyuanzhi, which also has the effect of curing diseases. The main functions of Mi Yuanzhi are soothe the nerves and refresh the brain, strengthen the brain and improve intelligence, and reduce phlegm and swelling.

Platycodon grandiflorum, also known as bellflower, bell flower, monk's hat flower, etc., is a perennial herb that is widely distributed in Northeast my country, North China, East China, and Central China provinces.

Banlangen has no obvious effect on the prevention and treatment of influenza. Banlangen is only effective for wind-heat type colds, and the symptoms do not match. Even if it is taken, it will not have the effect of preventing or treating influenza.

Poria cocos is the sclerotia of Poria cocos fungus Poria cocos. It is often parasitized on the roots of pinaceae plants.