Hyaluronic Acid Ultimate Hydration Serum (1 fl oz)

Return to Previous Page


What It Does:

  • Naturally plumps and replaces skin’s lost volume due to aging or dehydration
  • Reduces fine lines and creates a smooth, more glass-like surface to your skin
  • Enhances naturally highlighted areas of the face that become sunken with age
  • Helps skin retain moisture for a hydrated, dewy glow
  • Restores suppleness and bounce to skin that’s losing elasticity
  • Low-cost, more natural alternative to injections

Who It’s For:

Any skin type or stage of aging seeking to balance hydration levels and maintain plump, springy skin that looks smoother and firmer.

How It Works:

Hyaluronic acid (HA)is a polysaccharide that occurs naturally in the skin to keep it hydrated and to support the structural matrix of the skin, giving it a firm, smooth appearance. Our levels of hyaluronic acid diminish as we age, beginning as early as age 30, or with environmental damage and oxidation. The result is skin with less volume and plumpness. The work of our bodies’ own hyaluronic acid is also diminished by dehydration, since one of the molecule’s most important roles is to retain moisture in the skin by holding many times its weight in water.

Kate’s Hyaluronic Acid Ultimate Hydration Serum delivers a high concentration of hyaluronic acid to the skin, in a moisture-boosting serum. In addition to HA, our serum is infused with protective antioxidants to replace skin’s lost hyaluronic acid, while preserving the integrity of collagen and elastin. Just a small amount applied to skin after cleansing and toning will help your skin retain its youthfully hydrated and supple appearance, with a smoother surface texture.

Hyaluronic acid can also improve the anti-aging effects of other active ingredients by enhancing their penetration into the deeper layers of the skin, as well as keeping the skin conditioned and receptive to other topical treatments. The unique function and dramatic effects of hyaluronic acid make it an essential part of any skincare regimen, no matter your skin type or skin concerns.

Reviews (16)

16 reviews for Hyaluronic Acid Ultimate Hydration Serum (1 fl oz)

  1. Rated 4 out of 5


    This product saved my skin after having an allergic reaction to another product. It hydrated and reduced my inflammation. I use it nightly and my skin is very hydrated!

  2. Rated 5 out of 5


    Perfect and my skin definitely feels much better after 6 months of use. Will be using this for a long time.

  3. Rated 5 out of 5


    I use this at night before DMAE and collagen serums. I love how light it is. I have oily skin that tends to get very dry in certain areas so I’m very particular about what i use and would highly recommend this.

  4. Rated 4 out of 5

    Jessica D.

    I have been using a combination of kate ryan products for a little over 2 months now. Ive essentially purchased the clear skin collection and have used multiple products. They are fantastic. This one in particular I like to use after my toner, and before my total nutrition night repair cream. Just a little background, i have struggled with acne since I was a teen, and am in my early twenties. It is constant and despite focusing on stress, diet, etc, it still plagues me. Not cystic, or even exclusive to one area of the face, but just constant enough to really be frustrating. genetics and other factors i hadnt figured out. ive used countless natural products and havent seen results. I have seen the most results ever using Kate Ryan products. For this product in particular, I do not use it on its own as a moisturizer, but like it at night because a) i cant use it in the morning or else it flakes under my makeup and b) sodium hyaluronate holds water to the skin making your skin look plumper and dewier. That is important to have with a balance of the oils on your skin so the outside lipid barrier is moisturized but it has enough water inside it to hold as well. Honestly, from my skins perspective, I havent noticed a dramatic difference in dewy plump skin, but I have young skin to begin with. I do, however, find that with my routine, i wake up to a lot more glowy skin than I used to. And it feels really cooling and refreshing, so I love to have it as an addition. Over all, I think having a sodium hyaluronate addition to your skin care is a really important step, and I love this serum more than any other products or mists Ive tried!

  5. Rated 5 out of 5

    Bettina Shaip

    I have been using this product for almost 3 months. I love it and so does my hypersensitive/dry skin. I have Rosacea as well and this has helped my redness, bumps, inflammation, & dry areas. I can not believe the difference in my skin tone. Erica helped me choose the correct products for my skin & instructed me on exactly how to apply. I started out with once to twice weekly & now can use nightly. LOVE this product and the honesty and integrity of this company.

  6. Rated 5 out of 5

    Ann M

    I have been using this product for a month now. I use it at night after washing my face and before Collagen Booster. I am also using this on my chest where I have a few sun spots. It takes such a tiny amount which I just love.

  7. Rated 5 out of 5

    Nancy Ann

    I love this hyaluronic acid. It is the perfect prep for Vitamin C and Kate Ryan’s night repair moisturizer. I researched hyaluronic acid on-line and it definitely makes a difference in helping your skin absorb your serums and moisturizers. You only need a little bit, just one pump, for your face. I use this product every night and my skin feels so good in the morning. I recently returned from vacation and didn’t bring my hyaluronic acid (you can only fit so many liquids into the quart size bag!) I really noticed the difference in not having this product for 2 weeks! I won’t leave it at home again!

  8. Rated 5 out of 5


    I love this product! I have sensitive, acne prone skin. I pair this with the Salicylic Cleanser (I use the cleanser twice a day and the hyaluronic acid serum just at night) and have noticed a huge improvement in my skin tone and break outs. A little goes a long way and it absorbs quickly.

  9. Rated 5 out of 5

    Barbara R.

    I’m using this product along with the Vitamin C serum and my esthetician has noticed nice improvement in my skin

  10. Rated 5 out of 5


    I have recently started using the hyaluronic acid serum at night. So far, so good. I like how quickly it absorbs, and I do feel like my already soft skin is even softer.

  11. Rated 5 out of 5


    I have been using this product for a little over a month and am noticing improvements in my skin tone and texture. I am using this product in addition to the vitamin c serums and the evening retinol serum and I really am loving how the products work together.

  12. Rated 5 out of 5


    One of the best products I’ve ever used! I have extremely sensitive, tricky skin. I have rosacea and seb derm, and even many products formulated for rosacea irritate my skin.

    Just to give you a sense of how bad it was, I recently went two years without washing my face with anything but water, because my skin was too sensitive for even the most gentle cleanser. I eventually found an oil cleanser that I was able to use, but I still had flaky seb derm on my cheeks and nose, general bumpiness, and was also developing a very bad rough and bunched-looking texture around my chin and mouth. I thought I was just going to have to live with it, as I can rarely find any type of skin care product that doesn’t irritate my skin.

    But I’ve been using the hyaluronic serum along with the collagen serum for about four months now (second bottle of both) and I see quite a difference. The seb derm is 95% gone, the bumps have cleared up, leaving my cheeks smooth and soft, my face generally feels more resilient and less raw, and the rough texture around my chin looks about 50% better. I’ve also noticed diminished lines around my eyes. The lines are still there, but not nearly as deep as they were.

    I still have rosacea of course, the redness doesn’t go away, but all of the other improvements have been quite remarkable, and I feel much better about my appearance.

  13. Rated 5 out of 5


    I think this has to be my second favourite KRS product after the Vitamin C serum. You only need a little bit and it leaves your skin so smooth and soft. I have acne, so this is a perfect ”moisturizer” since it contains no oil. After 2 weeks, my face cleared up and my skin has never looked better!!!!

  14. Rated 5 out of 5


    I am 59 years old, and although I’m genetically blessed with good skin, I ride horses, hike, run, and spend a lot of time outdoors. Despite my use of well-known “cosmetic” lines of moisturizers, I had developed wrinkles around my eyes, on my forehead and (worst of all!) on my decolletage! I also had dark scaly spots on my cheeks. I have used the HA Ultimate Hydration Serum, in conjunction with the Total Nutrition Night Repair Complex, for approximately five weeks. My face looks better than it did in the past after using Retin-A for six weeks! The wrinkles have nearly vanished, and the dark scaly spots are gone – my skin is smooth and soft and glowing. Best of all, my decolletage is smooth again! Oh, and a little bit goes a long way! I haven’t even used half of the ounce, so this should last three months. Five stars, only because there aren’t ten!

  15. Rated 5 out of 5

    Melanie M

    I have aging skin, with larger pores, and occasional breakouts. Therefore, I am a little cautious about the type of moisturizer I use…it needs to keep my skin soft without being oily and making my pores look larger. This is it! You need only a very small amount, and your skin will feel great.

  16. Rated 5 out of 5


    I am using this hyaluronic acid serum at night after I’ve washed my face. I have oily skin and am prone to break outs and I’ve found that a light application of this all over my face really helps. The best part is that this serum absorbs quickly so it does not leave my face feeling greasy, just smooth and clean.

Add a review

Back to top