Phytolastil The Concentrate (Le Soluté) is a serum-gel that helps reduce the look of both new and older stretch marks. It has an unscented, non-greasy amber texture. It contains the Alchemilla-Ivy-Horsetail complex, plant extracts and silicon that help the skin make collagen and elastin. The formula has 98% natural-origin ingredients and suits all skin types, including pregnant women.