This best-selling Undaria seaweed-packed pair instantly transforms dry, distressed skin to soft, hydrated and glowing. Undaria Algae Body Oil (5 oz): A seaweed-infused body oil that softens, smoothes and leaves skin glowing. Undaria Algae Body Butter (6.7 oz): An age-defying body butter that transforms dry, crepey skin to soft, smooth and supple.