Obagi ELASTIderm Eye Complete Complex SerumDescription Eye Complete Complex Serum strengthens, firms, and rejuvenates your eye skin for a young and healthy look. Obagi ELASTIderm Eye Complete Complex Serum strengthens and firms the skin around your eyes, called periocular skin. It also builds collagenthe protein that makes your skin elastic. The periocular skin is the most delicate, complex, and thinnest human skinabout 0. 075 mm, in comparison to the average human skin thickness between 1. 5