What kind of people are suitable to eat iron bark? You should know that Dendrobium is the first of the “nine Chinese immortal herbs”, and its efficacy is absolutely guaranteed! However, before taking it, we must first understand its sexual taste, efficacy and indications. According to the Compendium of Materia Medica, Dendrobium is sweet in taste and slightly cold in nature, with the efficacy of “strengthening yin and benefiting essence, thickening the intestines and stomach, replenishing internal deficiency, lightening the body and prolonging life. It is mainly used for treating Yin injury and fluid deficiency, dry mouth and thirst, dryness and vomiting after eating, deficiency heat after illness, and darkness of the eyes. Since Dendrobium is cold in nature, it is easy to hurt Yang energy, therefore, it is suitable for people with Yin deficiency and heat. If people with Yang deficiency and cold take it, it will damage their own Yang energy and further aggravate their condition. Just like the neighbor of this female patient, according to her description, it is presumed that her spleen and stomach Yang deficiency, her gastrointestinal function is poor, the dendrobium does have the effect of “thickening the intestines and stomach” (tonifying the spleen and stomach), but its nature is cold, for the patient with spleen and stomach Yang deficiency not only can not play the role of tonifying the spleen and stomach, but also will further damage its Yang energy, so that the transport function of the spleen and stomach will be reduced again. As the spleen and stomach do not transport well, the accumulation of water and grain in the stomach will naturally lead to stomach discomfort and even stomach pain. This also shows that even though it is an immortal herb, it is not something that can be taken casually.