Yellow croaker, also known as the swim bladder of small yellow croaker, is roughly similar in efficacy to the whole swim bladder, with the main effect of tonifying the essence and blood, having the effect of stopping bleeding, as well as warming the spleen and kidneys and nourishing the five organs. In terms of pharmacological effects, it is suitable for some patients with deficiency cold in the spleen and stomach, deficiency cold in the spleen and kidneys, and for patients who are old and weak, postpartum, or weak after illness. Since it is sweet in taste and flat in nature, the scope of tonic is not too selective, and often some other tonifying medicines, or essence-attracting products are added for application according to different deficiency states of the human body. So the range of application is relatively wide and there are not too many restrictions.