Use a skin care product for at least 28 consecutive days (about 4 weeks before drawing final conclusions on a product, unless of course you have an allergic reaction!
The complete benefit of a skin care product won’t be visible until after a full cycle of skin-cell turnover to take place, at least a month. If after that time, you don’t see any improvements at all, you can just toss the product away. And because smoking and sun exposure can affect the results you get, you should avoid both as much as possible.
So be patient! Although some products begin to work sooner than others not all do!