Dr. Schuessler, a German homeopath, studied Homeopathy and made a profound study of the physiology and biochemistry; he proposed a therapeutics by means of substances that constitute the medicines of natural functions; the 12 tissues medicines. He observed that all diseases are related to a deficiency of mineral salts in the body. He discovered that the symptoms of the disease, or imbalance, vary according to what is lacking. Wilhelm Heinrich Schüssler - Doctor of Medicine, Physiological Chemist, Physicist and Homeopath - was born in 1821 in Germany. In his youth he was a linguist, and he began the study of Homeopathy while pursuing his regular medical courses at university. He developed what became known as the Biochemic System of Medicine. He described it in a book, Twelve Tissue Remedies, published in 1880. Subsequent physicians confirmed the results of his system and the use of inorganic substances present in the blood and tissues evolved naturally and with the inspiration of t