As I've looked tired for YEARS I finally took my injectors advise and tried Restalyne for my under eye dark circles and hollowness. I will advise - do not drink a few weeks prior to doing this, I was not told this and had very bad bruising and puffiness afterwards which was not ideal as I had this done on Christmas Day (as I live out of state I was piggybacking on the fact I was home for Christmas). Long short the bruising went down in about a week - thanks to lots of ice packs and arnica gel and as you can see the results were amazing! One syringe was used (no cannula - but next time I do this I want to try that method as I presume less swelling and brusing) and results seem to have lasted about 3 months.