Yon-Ka Paris Advanced Optimizer Serum 60ml #yongka #paris Luxury anti-aging serum to firm, lift and tighten skin. professional product; Our remarkable face firming serum is part of a two-step ritual that firms, lifts and tightens the skin. This anti-aging serum is powered by an advanced complex of redensifying and regenerating hibiscus peptides, soy peptides and marine collagen for a strengthening effect that helps defend against the progression of skin aging.