Parapharmacy products eucerin. PS pH5 Shower Oil. This shower gel, thanks to its formula, preserves the skin's natural reserves and protects it from dehydration. It's ideal for sensitive skin due to irritation. Contains pH5 citrate and extra-mild moisturizers that help care for the skin's protective barrier. naturale of the skin. Leaves skin soft thanks to intensive lipid replacement and helps prevent dehydration.