I have used many products with niacinamide as well as many other brighteners, and nothing compares to this. About three weeks after I started using every night, I noticed that my completely bare freshly washed skin looks like I'm wearing a luminizer. Not just brighter, but almost sparkling! It has to be the work of the peptide, everything else in here I've tried before. The instructions say to use twice daily, so I'm not even getting the full effect. Seriously, I look like I've been covered in Hourglass Ambient Lighting powder, and I didn't even know skin could do this!