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A single bottle of ISNTREE Ultra-Low Molecular Hyaluronic Acid Serum on a clean, reflective surface with soft, natural lighting.

ISNTREE Ultra-Low Molecular Hyaluronic Acid Serum

This Korean face serum offers next-level hydration with a complex of 14 hyaluronic acids, including an ultra-low molecular form (329 Da) for deeper penetration. Its lightweight, vegan formula absorbs instantly to quench skin from the inside out, leaving it plump, smooth, and refreshed without any sticky residue.
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The Isntree serum bottle with a focus on its clear glass dropper and the serum's transparent, fluid consistency.

Advanced Hydration Technology

The serum’s core technology is its complex of 14 hyaluronic acid types, featuring an ultra-low molecular weight component that enables superior skin penetration. This advanced formulation is delivered in a lightweight, fast-absorbing texture that layers effortlessly.
Visible Hydration Results

Plumper, Smoother Skin You Can See and Feel

Close-up of clear, viscous serum drops falling from a glass dropper into an open palm, showing the serum's lightweight texture.

Deeper Penetration for Lasting Hydration

The ultra-low molecular weight of 329 Da allows the serum to penetrate deeper into the skin’s layers, delivering hydration where it’s needed most for long-lasting plumpness and comfort.
A person's cheek with a drop of serum being gently patted into the skin, demonstrating the serum's application and absorption.

Multi-Level Moisture Barrier Support

A complex of 14 different hyaluronic acid molecules works to hydrate and support the skin barrier at every level, helping to lock in moisture and reduce the appearance of fine lines from dehydration.
A vibrant, plump cross-section illustration of skin layers, visually representing deep hydration from the serum.

Effortless Layering & Quick Absorption

The lightweight, fast-absorbing formula layers seamlessly under moisturizer and makeup without pilling or a sticky feel, making it an easy, effective addition to any routine for a refreshed complexion.
Ideal For

Perfect for These Skin Moments

A person touching their hydrated, glowing cheek, expressing relief from dryness.
Quench Dry Skin

Daily Hydration Boost

Combats seasonal or chronic dehydration, delivering deep, multi-layer moisture to visibly plump and soothe tight, dry skin for a comfortable, refreshed feel.
A serum being applied as the first step before makeup on a clean, bare face.

Priming for Makeup

Flawless Makeup Prep
Its fast-absorbing, non-greasy texture creates an ideal smooth, hydrated canvas under sunscreen and makeup, preventing pilling and ensuring long-lasting wear.
A person with calm, soothed-looking skin after applying a gentle serum.
Soothe Sensitivity

Gentle Care for Reactive Skin

Strengthens the moisture barrier with a clean, vegan formula, making it a gentle yet effective choice for sensitive skin seeking hydration.
A person applying a serum to their cheek using a dropper, demonstrating the recommended application method.
How to Apply

Maximize Your Hydration

For the best hydration, apply this serum to clean, damp skin. This simple method helps the hyaluronic acid molecules attract and lock in moisture more effectively, maximizing the plumping and soothing benefits for your skin.
A clean, damp face with water droplets, ready for serum application.

Start with Clean, Damp Skin

Start with a freshly cleansed face. For enhanced absorption, lightly mist your skin with water or apply the serum to slightly damp skin after cleansing and toning. This gives the hyaluronic acid something to bind to.
Serum being gently patted onto the cheek with fingertips for absorption.

Pat Gently onto Face and Neck

Dispense 2-3 drops of the serum into your palm. Gently press and pat the serum onto your face and neck. Avoid rubbing; patting helps with absorption and minimizes tugging on the skin.
A person gently pressing their palms to their face after serum application, encouraging absorption.

Seal with Moisturizer

Allow the serum to fully absorb for about 30 seconds. You should notice a hydrated, dewy feel without any stickiness. Then, proceed with your favorite moisturizer to seal in the hydration and complete your routine.
SkinCareExplorer
SkinCareExplorer
I was skeptical about another hyaluronic acid product, but this one from Isntree is different. The ultra-low molecular weight formula actually sinks in. My skin feels plumper and more refreshed immediately, and it layers perfectly without any stickiness. After a few weeks, my complexion looks noticeably healthier and more radiant.
KBeautyFan88
KBeautyFan88
This is my favorite HA serum! It's thin, absorbs quickly, and the dropper is easy to use. I've repurchased it many times. It leaves my skin feeling plump and healthy. I love that it includes ingredients like madecassoside to help strengthen the skin barrier alongside the hydrating hyaluronic acid.
GentleGlow
GentleGlow
This serum has become a staple for my sensitive skin. It's super hydrating and incredibly lightweight. I had zero irritation and instead, my skin feels fresh and hydrated after every use. I've noticed a real improvement in my skin's texture and overall appearance.
MorningRoutineLover
MorningRoutineLover
I had high expectations based on reviews, and it lives up to them. My skin feels so much more hydrated, and I love that it's vegan. It absorbs so well and doesn't leave a tacky feeling. I reach for it every morning as part of my routine—it's honestly one of the best serums I've tried!
TextureFocused
TextureFocused
The texture of this serum is perfect; it feels just right on my skin! It absorbs right in without leaving a greasy film, which I really appreciate for layering. My skin has looked more plump and well-hydrated since I started using it, and I couldn't be happier with the results.
Real User Experiences

What Our Customers Say

Hear from customers about their experience with the serum’s lightweight feel, immediate hydration, and how it improved their skin’s texture and overall radiance over time.

Your Hydration Questions Answered

Common questions about using this hyaluronic acid serum, including its suitability for different skin types, how it fits into a routine, and what to expect for visible results.
This serum is formulated for all skin types, including sensitive skin. Its clean, vegan formula is designed to hydrate without irritation. However, as with any new skincare product, we recommend a patch test on a small area of skin first to ensure compatibility.
For optimal results, apply 2-3 drops to clean, slightly damp skin after cleansing and toning but before your moisturizer and sunscreen. Using it on damp skin helps the hyaluronic acid lock in moisture more effectively. It can be used both morning and evening.
Many users report feeling immediate hydration and a plumper, smoother texture within the first few days. For more significant improvements in overall skin radiance and barrier strength, consistent use over 2-4 weeks is typically recommended.
Yes, it is designed to layer perfectly. Its lightweight, non-sticky texture absorbs quickly, making it an excellent base under moisturizers, facial oils, and makeup. It will not cause pilling and helps create a smooth, hydrated canvas.
The ‘ultra-low molecular’ refers to the weight of the hyaluronic acid molecules. At 329 Daltons (Da), they are small enough to penetrate deeper into the skin’s surface layers, providing hydration from within rather than just sitting on top, which can lead to more effective and long-lasting results.
This serum is vegan and formulated without animal-derived ingredients. Isntree maintains a cruelty-free stance, meaning the product and its ingredients are not tested on animals. It aligns with a conscious skincare approach focused on clean, transparent ingredients.
Discover More

Complete Your Hydrating Routine

Explore other lightweight, high-performance serums and essences from Isntree that complement this hydrator or target specific skin concerns like brightening, soothing, or pore care.
Isntree Hyaluronic Acid sunscreens displayed in a clean, natural light setting.

Isntree Sunscreen

Explore Isntree’s range of Hyaluronic Acid sunscreens, designed to merge sun protection with essential hydration. Compare formulas based on SPF strength, texture, and key ingredient benefits to find the daily defender that perfectly suits your skin’s needs and lifestyle.

Primary hero image of the Isntree Hyaluronic Acid Airy Sun Stick SPF50+ PA++++ (22g) product on a clean, light background.

Isntree Sunscreen Stick

ISNTREE’s Hyaluronic Acid Airy Sun Stick provides quick, easy SPF reapplication with an airy, feather-light texture. Its hypoallergenic formula is enriched with 8 types of Hyaluronic Acid for deep hydration and a plumped-up effect, plus Ceramide for barrier support.

Hero product shot of the Isntree Hyaluronic Acid Watery Sun Gel tube against a soft blue background.

Isntree Hyaluronic Acid Watery Sun Gel

This is more than a sunscreen; it’s a hydrating treatment that protects. By fusing the intense moisture-binding power of hyaluronic acid with advanced broad-spectrum filters, it defends against daily environmental stress while leaving skin feeling soft, dewy, and cared for.

The ISNTREE Green Tea Fresh Toner bottle, the primary product hero, displayed against a soft, natural green background evoking freshness.

Isntree Green Tea Toner

The ISNTREE Green Tea Fresh Toner is a quintessential K-Beauty staple, harnessing the antioxidant power of Jeju Island green tea. It uniquely balances effective sebum control with deep, lightweight hydration, making it a must-have for achieving a clear, refreshed, and shine-free complexion without irritation.