An aqueous solution comprising magnesium glycerophosphate, a polyol such as glycerol and glycerophosphoric acid. Preferably the polyol is glycerol which stabilises the solution, preventing the formation of precipitates and renders it suitable for oral administration. Also claimed is the aqueous solution used in the treatment or prevention of hypomagnesaemia and a method of treating or preventing hypomagnesaemia comprising administering the aqueous solution to a patient.
