The European conjunctiva is considered one of the main folk remedies in the treatment of thyroid gland diseases. Hyperfunction of this organ and subsequent hyperthyroidism are the most serious of them. With the help of conjunctival preparations, it is possible to cure heart diseases: tachycardia, heart failure, rapid heartbeat and other disorders of the heart muscle. This herb has a general sedative effect on the body in case of insomnia, increased excitability and neuroses, and also helps in the treatment of colds and coughs. Means from the conjunctiva are also used for diarrhea, diseases of the gastrointestinal tract, vegetative-vascular dystonia, uterine bleeding, and menstrual cycle disorders. This herb is mostly used for medicinal purposes. Collections are prepared from it, as well as independent funds. For the preparation of medicines, the entire above-ground part of the plant is prepared, it is usually collected before flowering, since at this moment it has the optimal composition of useful substances and microelements. The chemical composition of the conjunctiva includes phenolic carboxylic acids, which normalize the work of various glands of the human body, as well as tannins, vitamin C, antioxidants, lycopene, carotene and cardiac glycosides, thanks to which this herb has a beneficial effect on the cardiac muscle.