Woody Harrelson and partner Richard Deandrea have opened an oxygen bar on Sunset Boulevard, AP reports. O2 offers customers a 20-minute shot of oxygen for $13. For $2 more, the oxygen can be spiked with lemon, lime or orange. Proponents of recreational oxygen blasts claim it eases headaches, boosts alertness, fights fatigue and reduces stress. “It gives you a nice little buzz,” Harrelson, the former “Cheers” star, said. The club has had a steady flow of customers since opening last month. A club room has disc jockeys and dancing on weekends, and yoga classes and nutrition lectures are in the planning.