This product is AWESOME. Can't believe it took me so long to try it. I purchased it to use on dark spots from prior breakouts. I cleanse, use my advanced firming facial pad, then apply this serum. Once the serum is absorbed, I follow with HydroShield or Firmatone. My final step is moisturizer. Adding this product to the regimen has proven an amazing value - the spots are lightening. Could not believe I'm seeing results in only 10 days. I do use Dr. D's Day Cream with SPF30 - so important when using glycol's, retinol and lighteners. AWESOME.