cecith

Waterlock First Serum - Deep Hydration Booster for a Dewy, Healthy Skin Barrier

8 total reviews

Everyday Waterlock First Serum for a Dewy Skin Barrier. A lightweight foam-to-water first-step serum that floods skin with long-lasting moisture and helps rebuild a healthy, resilient barrier.

Why You'll Love It

  • Locks in long-lasting moisture - Helps to seal in hydration for all-day dewy skin.
  • Strengthens the skin barrier - Helps to build a healthy, resilient moisture barrier.
  • Soothes & comforts the skin - Helps to calm dryness and relieve irritation.

One Serum, 3 Ways to Beat Dehydrated Skin

  • Opens the water path - Mineral-rich formula guides moisture deep into skin.
  • Fills every layer - 10X hyaluronic acid quenches skin from the inside out.
  • Seals it all in - Jojoba & squalane hold hydration for all-day dewy skin.

Key Ingredients

  • Aquaxyl - Draws in moisture and keeps skin hydrated.
  • Acacia Peptide - Forms a moisture-locking layer to prevent dryness.
  • Reju-Biome - Helps support a healthy skin microbiome.

Clinically Tested

113.4% agreed skin felt more hydrated after use, and agreed it helped relieve irritated skin.

*Human application test conducted by Korea Institute of Dermatological Sciences, Feb 27 - Mar 20, 2026. 22 women aged 37-57. Results may vary.

When To Apply

  1. Use after cleansing and toning, as the first step of your skincare routine.
  2. Apply morning and night to lock in hydration.

Always finish with sunscreen for daytime. Use as a daily morning & night skincare serum.

Full Ingredients List

Water, Glycerin, Butylene Glycol, Simmondsia Chinensis (Jojoba) Seed Oil, Pentylene Glycol, Methylpropanediol, Xylitylglucoside, Sodium Hyaluronate, Xylitol, Sea Salt, Sea Water, Hydrolyzed Hyaluronic Acid, Hyaluronic Acid, Squalane, Glycereth-26, Panthenol, 1,2-Hexanediol, Trehalose, C12-14 Alketh-12, Ethylhexylglycerin, Anhydroxylitol, Coco-Betaine, Aminomethyl Propanediol, Beta-Glucan, Tocopherol, Ceramide NP, Hydroxypropyltrimonium Hyaluronate, Sodium Acetylated Hyaluronate, Hydrolyzed Sodium Hyaluronate, Micrococcus Lysate, Sodium Hyaluronate Crosspolymer, Dimethylsilanol Hyaluronate, Potassium Hyaluronate, Sodium Hyaluronate Dimethylsilanol, Carbomer, Disodium EDTA


Size: 150ml / 5.07 fl oz
Regular price $25.69 USD
Sale price $25.69 USD Regular price
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Tax included. Shipping calculated at checkout.

Details
  • Foam-to-water first-step serum for a dewy, healthy skin barrier
  • 150 ml / 5.07 fl. oz.
  • Key ingredients: Aquaporin and Mineral Complex, 10X Hyaluronic Acid, Jojoba Oil, Squalane
  • 3-step hydration: opens the water path, fills every layer, then seals it in
  • Lightweight foam that melts into water, with no sticky or heavy finish
  • For all skin types, including dry, dehydrated, oily-dehydrated and sensitive skin
  • Clinically tested: 113.4% agreed skin felt more hydrated and that it helped relieve irritated skin
  • Human application test conducted by Korea Institute of Dermatological Sciences, Feb 27 to Mar 20, 2026. 22 women aged 37 to 57. Results may vary.
  • Made in Korea
Product care
  • Use as the first step after cleansing and toning, morning and night.
  • Apply within 3 seconds of washing, while skin is still damp, for the best absorption.
  • Pump 1 to 2 times, press gently into the skin, then layer your usual essence, cream or oil.
  • Always finish with sunscreen during the day.
  • Patch test before first use if your skin is highly reactive.
  • Keep the cap closed and store away from direct sunlight and extreme heat or cold.
Shipping & returns
  • Free shipping on all orders over $100.
  • United States: delivered in 2 to 5 business days.
  • International: delivered in 7 to 10 business days.
  • A tracking link is emailed as soon as your order ships.
  • Duties and taxes may apply on international orders.
  • If anything arrives damaged or incorrect, contact us and we will make it right. See our Refund Policy for full details.

  • Safe Payment
  • Free Express Shipping*
  • Delivery 2-5 days
Jojoba + Squalane Seal.
Locks In Hydration.
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10X Hyaluronic Acid.
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Clinically Tested.
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Jojoba + Squalane Seal.
Locks In Hydration.
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10X Hyaluronic Acid.
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Clinically Tested.
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Jojoba + Squalane Seal.
Locks In Hydration.
◦
10X Hyaluronic Acid.
◦
Clinically Tested.
◦
Jojoba + Squalane Seal.
Locks In Hydration.
◦
10X Hyaluronic Acid.
◦
Clinically Tested.
◦
Jojoba + Squalane Seal.
Locks In Hydration.
◦
10X Hyaluronic Acid.
◦
Clinically Tested.
◦
Jojoba + Squalane Seal.
Locks In Hydration.
◦
10X Hyaluronic Acid.
◦
Clinically Tested.
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Clinically Tested Hydration — Feel It From Day One

In a human application test, users agreed their skin felt more hydrated and less irritated after use. Waterlock First Serum opens the water path, fills every layer with 10X hyaluronic acid, then seals it in with jojoba and squalane — for a dewy, barrier-strong finish that lasts all day.

The First Step Your Skin Drinks In

Use it right after cleansing, on damp skin. The watery, weightless texture sinks in on contact and preps your face so everything that follows — essence, cream, sunscreen — works harder.

Hydration That Stays Locked In

Aquaxyl draws water in, Acacia Peptide forms a moisture-locking layer, and Reju-Biome supports a healthy skin microbiome. Jojoba and squalane seal it all in — so the dewy finish is still there hours later.

Real results

What it did for their skin

Foam texture on skin
Calm, comfortable skin

★★★★★

I have been treated at a university hospital for a skin condition for years, so I have to be twice as careful as most people when I choose skincare. My skin is sensitive and dehydrated-oily, and even small triggers set it off, but this serum felt calm and comfortable from the first use. It hydrates without the greasy, heavy film I usually dread, more like a light moisture veil on the skin. No irritation, no allergic reaction, and I plan to keep buying it.

J. Park — sensitive, dehydrated-oily skin

Flaking, dehydrated skinBefore
Smooth, hydrated skinAfter 4 days

★★★★★

I am extremely dry, and my barrier had completely collapsed: flaking, deep dehydration, redness and breakouts from the slightest thing. I will not pretend one product erased all of that, but I could feel water filling in from underneath, and it took far longer before the tightness came back. Re-applying went from about three times a night down to one. The redness right after cleansing dropped noticeably too.

Y. Park — very dry, compromised barrier

Breakouts and rednessBefore
Calmer, smoother skinAfter

★★★★★

Acne, folliculitis, very oily skin, a broken barrier, redness and scarring. After a long course of antibiotics my face was the worst it had ever been. A little over a week with Waterlock and the dryness was gone and my barrier already felt stronger; my breakouts looked calmer too. It feels rich at first, but a few passes and it sinks straight in. Makeup sits beautifully over it, and after a month the small bumps on my forehead have really gone down.

M. Kim — acne-prone, very oily skin

Individual experiences shared by verified customers. Results may vary.

4.8
Rated 4.8 out of 5 stars
Based on 8 reviews
100%would recommend these products
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8 reviews
  • CT
    C. T.
    Flag of United States
    Reviewing
    Waterlock First Serum - Deep Hydration Booster for a Dewy, Healthy Skin Barrier
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Moisturizing and hydrating

    Before using this serum shake the bottle to mix the ingredients. You can see in the photo how it looks before shaking ( white foam on top, clear on bottom) and after where it’s mixed together. The pump works great where you can get a small amount out and that’s all it takes to do face and neck for me. It comes out in a foam that melts into water like serum as you rub it on. The serum soaked into my skin pretty fast and left my skin looking and feeling hydrated and moisturized. Directions say to apply after cleansing so it’s like a toner and serum combo. I didn’t smell any fragrance and it isn’t tacky, greasy or sticky feeling. I have dry patches after I clean my face and this got rid of them. My moisturizer went on smoothly and soaked in. The serum has quality ingredients like jojoba oil, squalane and Hyaluronic acid. I am pleased with this and think it’s a good value because it only takes a small amount so the bottle will last.

  • A
    Amy
    Flag of United States
    Reviewing
    Waterlock First Serum - Deep Hydration Booster for a Dewy, Healthy Skin Barrier
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    A Foaming Serum? Surprisingly Nice!

    I've tried plenty of facial serums, but this is my first foaming serum. I have to admit, when I first pumped it into my hand, I was a little concerned that it was going to be more like soap than serum. Thankfully, that's not the case at all. Although it comes out as a light, airy foam, once applied to my face, it feels much more like a traditional serum. It has a nice, slick consistency that spreads easily across my skin and feels hydrating and comfortable. It doesn't have that soapy feeling I was initially worried about. It is fragrance-free, which is important to me. I also like the ingredient list, which includes hyaluronic acid, jojoba oil, squalane, and other moisturizing ingredients. The bottle is a generous 5+ ounces, and because of the foaming dispenser, a small amount goes a long way. I think this bottle is going to last quite a while since I don't need much product with each application. It's definitely a different approach to facial serum, but it seems effective, and I'm pleasantly surprised by how much I like it. Between the hydrating feel, easy application, and generous amount of product, I think it's a great value for the cost.

  • S
    Sammy
    Flag of United States
    Reviewing
    Waterlock First Serum - Deep Hydration Booster for a Dewy, Healthy Skin Barrier
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Hydrating first serum

    I really like the experience of applying this skincare product. The bottle needs a shake first, to mix the layers evenly. Then it pumps out in a nice foam that was super easy to apply. A little goes a long way. I have not had any drips or mess associated with the pump. No fragrance or essential oils are included. I did not detect any scent. While the Cecith Waterlock First Serum goes on thinly, it does leave my skin slightly sticky. However, it's not uncomfortably tacky - I take it more as a sign that it really is helping in improve the "moisure-locking" ability of my skin. Overall, it absorbs quickly. Two thumbs up, I'll continue to include this product in my nightly routine. On first application, I only used this product and then my usual moisturizer. And honestly, the two products felt like "enough" - leading me to think this is a highly effective serum, even if it's a "first" one intended to be followed up with others.

  • K
    Kim
    Flag of United States
    Reviewing
    Waterlock First Serum - Deep Hydration Booster for a Dewy, Healthy Skin Barrier
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Love This K-Beauty Serum!

    The viscosity of this serum looks intriguing! There is mostly a clear, watery layer on the bottom and some white, milky layer on top. When you tilt the bottle, this milky layer floats around gloopishly. Before using it, you’re supposed to shake the bottle to mix the 2 layers together. What’s even more fascinating is that what actually gets pumped out is a foamy product! As you massage this foam into your skin, it transforms into a watery, weightless consistency and absorbs beautifully without any stickiness. It layers under other products with no issue and is scent-free. My skin feels noticeably hydrated and more refined!

  • M
    Miname
    Flag of United States
    Reviewing
    Waterlock First Serum - Deep Hydration Booster for a Dewy, Healthy Skin Barrier
    I recommend this product
    Rated 4 out of 5 stars
    1 week ago
    Try this serum

    Deep hydration without the heaviness. This serum really helps with that tight, dry feeling and leaves skin soft and comfortably plump. The mix of hyaluronic acid, panthenol, ceramide, and oils gives the moisture barrier a nice boost. It absorbs fast, no stickiness, and works well as the first step before moisturizer or sunscreen.