Method of preparation: Brew 2 teaspoons of tea with a glass of boiling water (200 ml), cover, leave for 20 minutes. Yarrow has long been used to treat digestive issues like ulcers and irritable bowel syndrome (IBS), symptoms of which include stomach pain, diarrhea, bloating, and constipation. The flavonoids and alkaloids in yarrow tea may alleviate symptoms of depression and anxiety. Studies demonstrate that plant-based alkaloids like those in yarrow tea reduce the secretion of corticosterone, a hormone that's high during chronic stress. Yarrow has been shown to aid certain brain disorders, such as multiple sclerosis, Alzheimer's, Parkinson's, and encephalomyelitis — inflammation of the brain and spinal cord caused by a viral infection. Do not use the ingredients of herbal tea in case of individual intolerance. The use of yarrow is contraindicated in pregnancy.