I used this product for about a month and did not notice a noticeable difference in my skin. The serum is a liquid consistency and doesn't have much scent to it. I applied the time-wise serum at night and it feels nice and light on my skin but overall, no noticeable changes. Perhaps I needed to use it for more than a month, but the vial doesn't contain too much product so I wasn't able to use it for much longer than a month.