Novel peptides referred to as small humanin-like peptides (SHLPs) are provided herein along with nucleic acids encoding SHLPs and probes that selectively bind SHLPs. SHLPs have wide-ranging activity, including neuroprotective activity, anticancer activity, and cell survival activity. Also provided herein are therapeutic methods comprising administering an effective amount of an SHLP to a subject in need of treatment.
