Soothing isotonic cream with St. John's wort extract and isotonic seawater, preservative-free. Soothes joint and muscle pain. OCEAU MARINE creams are composed of marine active ingredients. Their active ingredient, Quinton serum, provides an ideal balance of bioavailable minerals. This seawater, brought to plasma isotonicity according to the principles of René Quinton, is similar to the extracellular fluid in which an organism's cells develop.