Magnesium hypophosphite is a salt of magnesium and hypophosphorous acid. In human medicine, magnesium hypophosphite was used as a tonic, but by 1970s no manufacturer indicated that hypophosphite was in use. Later, it was shown that hypophosphites are antibotulinal and antimicrobial inhibitors. Magnesium hypophosphite is extensively used in veterinary as a supplement of magnesium and phosphorus to correct metabolic disturbances. In combination with calcium borogluconate it is effective in the treatment of hypocalcemia with associated magnesium and phosphorus deficiencies.