This is a fantastic product that I've been using for a little less than a year now. I have combination skin (very oily t-zone, normal cheeks) and even though my skin would always be oily, it would still feel tight and be flaky. Applying moisturizers didn't really work - they just sat on top of my skin and didn't solve anything. Ever since learning the difference between dry skin (needs oil) and dehydrated skin (needs water/moisture) everything has started to make a lot more sense to me. It became apparent to me that I have dehydrated oily skin and that I needed to use hydrating products, not just any moisturizer. The ingredient best known to add/retain moisture to the skin is hyaluronic acid. It is in tons of moisturizers, but my skin is very clog prone and instead of trying dozens of creams hoping to find one that didn't clog me, I just opted for this pure hyaluronic acid instead. It's not actual pure hyaluronic acid, but hyaluronic acid is the main ingredient and it has very few other ingredients (Hyaluronic Acid, distilled water, potassium sorbate, citric acid). So the chances of it breaking anyone out are very small.Results: in the beginning I didn't really notice much of a difference in my skin since using this. It felt exceptionally soft, but I didn't actually see a difference. I just kept using it though, but once I went on a vacation I did not take it with me to save on weight. While on vacation I noticed my skin getting less 'nice', but didn't think it was because I stopped using this product. Back home however, I started using this again and then I noticed the difference. My skin was getting nicer again. I've been using it twice daily ever since and I've been loving it. The results have been very gradual, but now I notice that my skin is a lot happier. The main thing I've noticed is that my skin just feels a lot more balanced. It feels comfortable, even without moisturizer, and the flakes are gone. I also noticed that my skin has actually gotten less oily. I still have oily skin and I still need to wear powder and blot during the day, just less often than before.The product comes in in a dark glass bottle with a pipette. It's very hygienic and easy to use. I just squeeze out 3 drops and that is plenty for my face and neck. The product itself is called a gel, but it is much more liquid than that. It's only slightly thicker than water. When you apply it feels as if you just applied water to your face, except it sinks in right away.As someone with oily skin I -hate- the feeling of having a layer of product on my face, and I can safely say that this literally feels as if you have nothing on your face. It's gone instantly. So even though I hate adding layers to my face, I don't really see this as an extra step and I have no problem using it day and night.A thing that I read about hyuluronic acid though, is that it pulls moisture to your skin from the air. But if the air is very dry then it will not work and might it might actually make it worse (by pulling the moisture out of your skin). So to make sure it works properly, it's best to apply it to damp skin. That way you're sure there's always water available to the hylaronic acid to hold on to. Used like that, it has really helped my dehydrated skin.The price of this product is a steal. It's only 15 dollars and you only need a few drops each time, so it lasts a long time. I'm on my 3rd bottle.Also nice: it's the perfect base for a DIY vitamin C serum. In the PM I like to add a bit of ascorbic acid to the serum on my hand, wait a minute for it to dissolve and then apply my fresh vit C to my face. When I do this I use 4 drops of the serum instead of 3.Overall this is a great product if you have dehydrated skin, for a great price. Don't expect miracle results right away though, give it some time.