Haeckels’ use of seaweed is truly unique, and this bath soak uses it in its purest, most complete form. The British brand hand-harvests this specific variety— fucus vesiculosis, or bladderwrack— from its local Jurassic chalk reef, and its naturally occurring antioxidants and vitamins turn your bath water into a liquid skin rejuvenator when it’s soaked. You can use it as a garden fertiliser, too, after it’s used.