I ordered this by accident while trying to re-order another product from PBH. I never believe miracle promises after 30 years of buying skin care products, but this one IS amazing and works! At first I thought it was my imagination. But daily scrutiny in the mirror has made me a believer. It bothers me to expose it to the air when using the dropper because vitamin C deteriorates very quickly that way, I wish it was in a pump bottle. That is the only downside. I still can't get over how great it makes my skin look and feel. *** Make certain to use it on your entire face, neck, ears, and chest or your face will look like a mask of pretty young skin on an old neck...I am editing my initial 5 star review of this product and lowering it to 2 stars. After using this product twice a day for almost 3 weeks now I have failed to see the same results I have gotten in the past from using other CE Feurlic acid serums. I'm not sure why this serum has not worked like the more costly Paula's Choice C serum I have used with great results since the alive ingredients are almost the same, but it hasn't and I am quite disappointed. I have now ordered products from OZ and hope to see better resultsI am not sure about this product. It feels like water, and I am not sure that it is working. I used it only a couple of times, and it did not blow me away. I have not seen any results yet.I've been looking for an off-the charts Vit C Serum and believe I've found it! The ingredients are amazing! I've heard that people are RAVING about Perfect Body Harmony's Serum. One of my best friend's ordered it before I did and can't say enough about the difference it's making for her in less than one week's time! Perfect Body Harmony, you seem to have started a "buzz" around here...the word is spreading and I can hardly wait to join the "Kudos to You" crowd!I love this but it's a little expensive so i can't buy as often as I feel I need to use it....I have mixed feelings about this. I think if my skin weren't so sensitive it would be a good product, but I find the acidity of the vitamin C very drying. (I have acne/rosacea/sensitive/combination skin).This product is sticky compared to other vitamin C serums I have used. Will finish it, but will not purchase it again. Good packaging.Never used before and haven't used much yet but seems very nice