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I have a minor stretch mark problem from my puberty when I was growing way too fast. Shame that I didn't use any relevant products for prevention, because getting rid of stretch marks is a lot, A LOT harder than preventing them from happening in the first place. So if you are fortunate that you don't have any yet but fear that you will, then I suggest you start using it early!
You are supposed to rub this on your problem areas after showering/bathing, on your damp body. The texture of the oil is thick, so you don't have to use a lot which is good because the bottle will probably last you at least 2-3 months even if you use it everyday! The smell is quite strong but nice, kind of a mixture of musky and flowery scent.
I have now used this product (almost) everyday for about 2 months now. No dramatic improvement on my stretch marks, but some of them do seem a little lighter in colour. But the product is not supposed to work instantaneously - it is supposed to make your skin gradually more elastic. So I will update here again for a progress report further down the road.
Price: £37 for 100ml; alternatively, purchase the "pregnancy kit" online on Clarins.co.uk which cost £36, includes the stretch mark control cream along with a small 30ml bottle of tonic oil! To me that is a much better deal.