Astragalus, Radix et Rhizoma Ginseng and Radix et Rhizoma Ophiopogonis have the functions of tonifying Qi and nourishing Yin. 1. Astragalus: It can replenish qi and elevate yang (replenish qi so that yang qi can rise), consolidate the surface and stop sweating (stop sweating by consolidating the surface of the muscle), promote water retention and reduce swelling (promote urination and eliminate edema), generate fluid and stop bleeding, relieve pain and paralysis, support the toxin and expel pus (expel pus and poison in the body), astringent sores and promote the growth of new flesh) and so on. Clinically, it can be used to treat the symptoms of qi deficiency such as fatigue, loose stools (thin and unformed feces); the symptoms of qi subsidence (deficiency of spleen and stomach qi, which results in the fall of internal organs) such as prolapse of internal organs and prolapse of anus; the symptoms of self-sweating (involuntary sweating during the daytime, which is aggravated with the slightest movement), excessive sweating, etc., such as the symptoms of superficial deficiency (weakness of the muscle surface, resulting in the sweat going out abnormally); the symptoms of canker sore such as the sore that does not converge for a long period of time, etc. 2. Radix Codonopsis pilosulae: with the function of strengthening the spleen and lungs (strengthening the functions of the spleen and lungs), nourishing blood and generating fluids, it can be used for the treatment of deficiency of the spleen and lungs, such as poor appetite, fatigue and weakness, coughing, asthma, etc.; and the evidence of deficiency of blood and fluids, such as yellowish color (yellowish color without luster), palpitation (accelerated heartbeat often accompanied by heartburn), thirst, and dryness of the mouth. 3. Maitong: It has the function of nourishing Yin and generating fluid, clearing the heart and moistening the lungs, and can be used to treat the evidence of lung dryness and fluid injury, such as thirst, dry mouth, dry cough, sore throat, intestinal dryness and constipation. Astragalus, Radix et Rhizoma Ginseng, and Maitake have the function of nourishing qi and yin, promoting the production of fluid and blood (replenishing the body’s water and blood), but they are not suitable for those who are suffering from dampness-heat syndrome, as they can exacerbate dampness-heat phenomenon. It is recommended to use these three herbs under the guidance of a professional doctor.