Fresh Dendrobium clears away heat and produces fluid, and evil heat enters the blood. It is suitable for patients with high fever, while dried Dendrobium is good at nourishing yin and tonifying deficiency, and is suitable for patients with yin deficiency and excessive heat in the late stage of fever. Dendrobium candidum and Dendrobium nobile have strong medicinal properties; Dendrobium huoshanense, suitable for the elderly with fatigue and insufficient vaginal fluid, is an earring Dendrobium, which produces body fluid without cold and replaces tea to stimulate appetite and strengthen the spleen. Dendrobium nobile and Polygonatum odoratum both have the functions of nourishing yin and promoting body fluid, and their functions are similar. However, Dendrobium is sweet and salty, but cold in nature, and the tonic is clear. Being good at nourishing stomach and kidney yin, Yuzhu tastes sweet and smooth but not greasy, followed by nourishing lung and stomach yin. There are differences between the two drugs, each with its own advantages and disadvantages.
Chinese medicine believes that American ginseng is cold and slightly bitter. Entering the lung and spleen meridian has the functions of benefiting qi and nourishing yin, purging fire and relieving annoyance, nourishing stomach and promoting fluid production. It is suitable for fire syndrome of deficiency of both qi and yin, and is mostly used for dry cough due to lung heat, laziness in speaking due to qi deficiency, weakness of limbs, irritability due to yin injury after fever, and loss of body fluid.