Borage is a fairly common domestic herbal remedy that has been used since ancient times. It has a particularly good reputation for its beneficial affect on the mind, being used to dispel melancholy and induce euphoria. It is a soothing saline, diuretic herb that soothes damaged or irritated tissues. The leaves, and to a lesser extent the flowers, are demulcent, diaphoretic, depurative, mildly diuretic, emollient, expectorant, febrifuge, lenitive and mildly sedative. An infusion is taken internally in the treatment of a range of ailments including fevers, chest problems and kidney problems, though it should not be prescribed to people with liver problems. Externally it is used as a poultice for inflammatory swellings. The leaves are harvested in late spring and the summer as the plant comes into flower. They can be used fresh or dried but should not be stored for more than one year because they soon lose their medicinal properties. The seeds are a rich source of gamma-linolenic acid, this oil helps to regulate the hormonal systems and lowers blood pressure. It is used both internally and externally, helping to relieve skin complaints and pre-menstrual tension. Used for the treatment of phlebitis. Source: https://pfaf.org/
Find more about this plant on Wikipedia.