IsNtree Hyaluronic Acid Serum 14-Type Ultra-Low 329 Da – Deep Hydration, Lightweight 1.69 fl oz

ISNTREE Ultra-Low Molecular Hyaluronic Acid Serum is a lightweight Korean face serum formulated with 14 types of hyaluronic acid, including ultra-low molecular weight (329 Da), to deliver deep, fast-absorbing hydration without stickiness.

This serum combines a layered hyaluronic acid complex with mineral-rich sea water from Ulleung Island to support skin moisture retention and a smooth surface feel. Designed for everyday layering, it absorbs quickly and leaves a non-greasy finish suitable for morning and evening routines. The formula is vegan, free from fragrances and harsh additives, and tailored to work for sensitive skin while strengthening the skin’s hydration barrier.

How does this serum hydrate deeper than regular hyaluronic products?

The key is its multi-weight hyaluronic acid blend: 14 different HA molecules range from surface-level film-forming types to ultra-low molecular hyaluronic acid that penetrates more deeply. The tiny 329 Dalton molecules are small enough to reach lower layers, supporting longer-lasting moisture below the skin surface while higher-weight HAs maintain surface hydration.

• 14-type HA complex targets multiple skin layers
• Ultra-low molecular HA (329 Da) designed for deeper delivery
• High-weight HAs create a moisturizing film on the skin’s surface
• Layering-friendly texture to boost other moisturizing products

Will this serum feel heavy or leave a sticky residue?

No — the serum is formulated to be lightweight and fast-absorbing, so it sinks in without tackiness. It’s specifically created for layering under creams or makeup and to provide a refreshed, smooth finish rather than a heavy, occlusive film.

• Feather-light texture for easy layering
• Fast absorption minimizes waiting time before other products
• Leaves a smooth, non-greasy surface ideal for makeup application
• Compatible with oils and creams for added moisture sealing

What role does Ulleung Island sea water play in the formula?

Sea water from Ulleung Island supplies natural minerals that help skin retain moisture and support the skin’s barrier function. These minerals work alongside the hyaluronic acid complex to strengthen hydration performance and improve overall skin texture without adding heavy emollients.

• Mineral-rich sea water supports moisture retention
• Works synergistically with HA to reinforce hydration barrier
• Helps maintain a balanced skin surface without heaviness
• Natural ingredient source aligned with clean formulation goals

How safe is this serum for sensitive or vegan skin routines?

The serum is vegan and designed without animal-derived ingredients, fragrances, or harsh chemicals, minimizing common irritants. Its clean, gentle profile and lightweight delivery make it suitable for sensitive skin types, though patch testing is recommended for extremely reactive skin.

• Vegan formulation with no animal-derived components
• Fragrance-free to reduce irritation risk
• Free from harsh additives commonly linked to sensitivity
• Suitable for everyday use in morning and evening routines

Who is this for: ISNTREE Ultra-Low Molecular Hyaluronic Acid Serum is ideal for anyone seeking intense, multi-layered hydration without a heavy finish — especially dry, dehydrated, or sensitive skin types that want a fast-absorbing serum to layer under moisturizers and makeup. It also suits those who prefer vegan, fragrance-free skincare and want mineral-rich support from natural sea water to help sustain moisture and a healthy-feeling skin barrier.

Ingredients

Sea water, water, methylpropanediol, glycerin, butylene glycol, 1,2-hexanediol, hydrolyzed hyaluronic acid, sodium hyaluronate, hydrolyzed sodium hyaluronate, potassium hyaluronate, sodium acetylated hyaluronate, hydroxypropyltrimonium hyaluronate, sodium hyaluronate crosspolymer, dimethylsilanol hyaluronate, hydrolyzed calcium hyaluronate, sodium sulfated hyaluronate, sodium stearoyl hyaluronate, sodium oleoyl hyaluronate, hyaluronic acid, betaine, pentylene glycol, carbomer, caprylyl