SBL Magnesia Phosphorica Biochemic Tablet is an excellent anti spasmodic remedy and contains the mineral magnesium which is rewired by the body for a number of reactions like pains all over the body like back leg or calf muscles. Mag phos. is a mineral supplement to restore energy and begin the regeneration of the body’s nerves and muscles. It deals with the recovery of any nerve injury or nerve damage. Key Ingredient