The invention is a composition of human insulin or insulin analog that includes specific concentrations of citrate, chloride, in some cases including the addition of sodium chloride, zinc and, optionally, magnesium chloride and/or surfactant, and that has faster pharmacokinetic and/or pharmacodynamic action than commercial formulations of existing insulin analog products.本發明為一種人類胰島素或胰島素類似物之組合物,其包括特定濃度之檸檬酸鹽、氯化物,在一些情況下包括添加氯化鈉、鋅及視情況選用之氯化鎂及/或界面活性劑,且其具有比現有胰島素類似物產品之市售調配物快的藥物動力學及/或藥效學作用。