A buffered body fluid expander solution, in which the buffer is a physiologically acceptable buffer that is not an inorganic phosphate buffer, comprises calcium ions and magnesium ions at a concentration ratio of 5:1 to 1:1. The non-phosphate buffer may be a physiologically acceptable N-substituted aminosulfonic acid buffers, especially those having a pKa value in aqueous solution of from 7.1 to 7.5 at 2O0C, and most preferably N-tris(hydroxymethyl) methyl-2-aminoethanesulfonic acid (TES), 3-(N-morpholino) propanesulfonic acid (MOPS), N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid (BES) and combinations thereof. Preferred components include from 100 to 150 (preferably about 135) mmoles/L sodium ions, from 2.5 to 6.2 (preferably about 5) mmoles/L potassium ions, from 0.1 to 2.5 (preferably about 1.25) mmoles/L calcium ions, from 0.4 to 25.0 (preferably about 0.45) mmoles/L magnesium ions, from 96 to 126 (preferably about 118) mmoles/L chloride ions, 2 to 11 mmoles/L (preferably about 10) glucose (preferably D-glucose), from 50 to 150 (preferably about 110) &mu；moles/L glycerol, from 7 to 15 (preferably about 10) &mu；moles/L choline, from 5 to 400 (preferably about 300) &mu；moles/L glutamate (preferably L-glutamate), from 5 to 200 (preferably about 20) &mu；moles/L aspartate (preferably L-aspartate), from 100 to 2000 (preferably about 400) &mu；moles/L glutamine (preferably L-glutamine), from 15 to 215 (preferably about 60) &mu；moles/L pyroglutamate, from 20 to 200 (preferably about 100) &mu；moles/L arginine (preferably L-arginine), from 1 to 120 (preferably about 40) nmoles/L thiamine pyrophosphate (TPP), from 40 to 70 (preferably about 50) &mu；moles/L D- or DL or L-carnitine (preferably L-carnitine), and from 5 to 200 (preferably about 28) ml.U./L porcine or human insulin (preferably human insulin). The solutions are useful for the manufacture of medicaments and blood volume expanders, for treating hypovolemia or for treating the loss of extracellular and intersti
