Joint N-11 Reviews (Zenith Labs) Negative Side Effects or Real Benefits? Joint N-11 by Zenith Labs is a doctor-formulated natural joint health support supplement with potent ingredients meant to support healthy flexibility and mobility, but does it have negative side effects or is it worth the money? April 22, 2021 16:44 ET | Source: Marketing By Kevin Marketing By Kevin Homewood, Illinois, UNITED STATES New York, NY, April 22, 2021 (GLOBE NEWSWIRE) -- As people get older, they are more likely to experience joint pain and inflammation. Their immunity subsides and different problems that create damage to their healthy life set in. Most people who find themselves in this situation often seek solutions in programs, medicines, dietary supplements, controlled diets, and exercise to relieve joint pain, stiffness, and restore their bone health.