I got a sample of this & used it over 3 nights under my night moisturizor. It gave me a radiant glow each morning, as though I had 10 hours of sleep! (when I had only 6hrs each night) That convinced me to rush out there to buy the full-sized bottle.
For the first week, it did give me a nice rosy glow each morn but sadly by the 2nd week, the radiant effect ceased. So I stopped the product for a month & the next time I tried it, the glow came back again although the effect was not as good as the first time I tried it. Perhaps the “nutrients” in the serum get less effective over time due to exposure? Or could this be a one-hit wonder? Nevertheless, I’m finishing my 1st bottle & will repurchase a 2nd bottle in the hope that I can get back that amazing glow which I got when I first started.