I have only been using this product for a couple weeks now, but it is working.
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CosMedix Lightning Serum Review #2
Pros: lightweight, absorbs quickly
Ease of Use
-February 28, 2011
I am on my second bottle of this and all my darkness is gone. Just ordered this bottle to make sure I maintained over the summer with any new sun damage that I may receive, but will be trying to avoid with my SPF.
I like that I can but this all over my face not just on my dark spots because it doesn't have bleach in it. With other lightning serums I could only apply to the darker areas because of the bleach in them.