I bought a 200ml bottle for an old scar on my thigh. The bottle is almost gone and I haven't noticed any change in the appearance of the scar. I will buy another bottle and keep applying throughout the winter season to see if there will be any change. However, I started applying Bio Oil on a new scar and that mark has disappeared. I also used the oil as a moisturiser every evening on my face and that has worked out great. I noticed that the marks I had on my face have disappeared. I will definitely continue using it as a moisturiser every night during the winter season. I have come to the conclusion that Bio Oil works faster on fresh scars & marks whilst older scars and stretch marks require prolonged use for a more noticeable improvement in their appearance. The 200ml bottle goes a long way.