ALLM (Calpain Inhibitor) is cell-permeable, peptide aldehyde inhibitor of calpains and cathepsins.

A potent, cell-permeable calpain inhibitor with Ki of 0.6 and 100 nM for calpain L and calpain B, respectively; inhibits the activities of Ca(2+)-dependent neutral proteases as well as lysosomal proteases, including cathepsin L, cathepsin B, and cathepsin D; induce apoptosis in rat pituitary tumor cells by specific caspase activation.