What is the efficacy of corn beard boiled water

There is no such drug as corn whiskers, it should be corn whiskers. This product boiled in water has the effect of promoting water retention and eliminating swelling, and inducing dampness and jaundice (eliminating dampness and eliminating jaundice).
Cornhusk is a traditional Chinese medicine, which comes from the stigma and column of the corn plant Cornus sativus. This product is commonly used clinically for the treatment of nephritis and edema, dysuria (unsmooth urination), damp-heat jaundice, hypertension and other conditions. The adverse reactions and contraindications of this product are not precise for the time being.
Clinically, it is not usually used alone, and is often combined with Atractylodes macrocephala and Poria for edema in spleen deficiency; with Plantago asiatica for astringent pain in urination caused by dampness-heat in the bladder; with Hai Jin Sha for stone drenching (discharge of gravel in urination or sudden interruption of urination, pain in the urethra, intolerable lumbar and abdominal cramping pains); and with Qian Qian Cao for diuresis to relieve dampness and jaundice.
Patients with discomfort are advised to seek prompt medical attention and standardize treatment. Before taking this medicine, it is necessary to be guided by a Chinese doctor for identification of symptoms, and not to take the medicine by oneself to avoid adverse consequences to the body.