hi there...i just wondering why my sister have already use this product for 4 years but it seems no improvement...one of the beauty house recommended my sister to use this product and even sign up for lots of facial treatment but looks like the product have yet to finish use, the people there keep asking her to buy other product and in the end there still din show any good sign of her skin...she still have lots of pimple and acne even thought she use it as instructed...