Opened, USED ONCE. Tight Arm. All Charm. Get firmer-looking arms with this clinically proven cream that targets the appearance of saggy and loose underarm skin, helping to create a tighter-looking arm. 100 mL. / 3.38 Fl Oz. Our formulas go through rigorous clinical trials conducted on panels of real women. The trial found that B-FLEX is: Clinically proven to help create a tighter, sleeker, upper arm area. Clinically proven to help smooth the look of crepey skin. Clinically proven to help smooth and tighten the look of arms. Clinically proven to help create a more taut and toned-looking silhouette. Clinically proven to help give a more defined, smoother look to the arms.