The ferr. Phos. remedy is made from iron phosphate, wich is a chemical combination of iron sulfate, sodium phosphate, and sodium acetate. it is one of the 12 biochemical tissue salts developed by the German physician Wilhelm Schussler between 1872 ans 1898. Schussler belived many complaints were the result of a deficency of minerals, and that by replacing these minerals, or tissue salts, health could be restored. Schussler found Ferr. phos. particulary useful in the early stages of inflamation, and the homeopathic remedy is used for simmilar purposes.