Peer support has a long history dating back to early humans helping one another for survival. More recently, peer support was recognized in the 1800s for helping those with mental illness and substance abuse disorders. Throughout the 1900s, the peer support movement grew and formalized with the establishment of peer support programs and certification of peer specialists. Research shows that peer support can be as effective as services from traditional professionals, reduces hospitalizations and costs, increases empowerment, and introduces alternative treatments. Peer support now serves a variety of populations and settings beyond just mental health.