Specially formulated for post-partum skin care, mustela 9 months stretch marks intensive action reduces existing stretch marks with its exclusive combination of vitamins and naturally-derived ingredients: restores skin quality with its patented anti-stretch marks formula that stimulates the production of collagen and elastin. helps repair the skin thanks to vitamin b5 and copper gluconate, which stimulate the regeneration of skin tissue. avocado peptides and hydrating shea butter provide the skin with immediate relief and lasting nourishment. leaves the skin more nourished and supple.apply stretch marks intensive action to stretch marks morning and night for 3 months. apply directly to all existing stretch marks.when to use this lotion is specially designed for post-partum use to reduce the stretch marks that appeared during pregnancy. however, you can also use it to treat stretch marks during pregnancy.