It's a natural spray that mixes contact killing with an effective 2 week residual effect and bed bug egg killing power. But even MORE importantly. its been successfully tested to work. In 2013 the Department of Entomology at Rutgers University found that EcoRaider was as good as the leading synthetic chemical bed bug spray and reduced bed bug populations by 92% over a span of 12 weeks. During the study, EcoRaider was reapplied to affected areas on a biweekly basis totaling 6 treatments.