Hours Of Operations GNC California Diamond Bar GNC Hours of Operation and Locations in Diamond Bar, CA 4.9 - 150 votes 1 Locations in Diamond Bar GNC Hours Category: Beauty & Health GNC - Diamond Bar, CA 91765 21347 Cold Spring Lane(909) 468-4600 View Store Details Explore Diamond BarView More Apparel Big LotsH & MCarharttCarter'sCatherines Sports TargetLA FitnessColemanAll American Sports ShopAll Sports Recommend For You Cotton on Bally Total Fitness Eastern Mountain Sports Trader Joe's The Athlete's Foot Diane's Beachwear Bottega Veneta Hanna Andersson Louis Vuitton Sportsman's Warehouse