IsNtree Hyaluronic Acid Serum 1.69 fl oz — 14‑Type Ultra‑Low Molecular HA for Deep Lightweight Hydration

ISNTREE Ultra-Low Molecular Hyaluronic Acid Serum is a fast-absorbing Korean face serum that delivers deep, multi-layer hydration using an advanced 14-type hyaluronic acid complex with ultra-low molecular weight for lasting moisture without heaviness.

Designed for those who want intense hydration without tackiness, this serum combines 14 molecular sizes of hyaluronic acid — including an ultra-low 329 Da fraction — with mineral-rich sea water from Ulleung Island. The formula aims to supply moisture to surface and deeper skin layers, support a healthy moisture barrier, and layer smoothly under creams or makeup. It is vegan and free from fragrances and harsh additives, crafted to be skin-friendly for many routines.

How does this serum hydrate different skin layers?

The serum uses a blend of 14 distinct hyaluronic acid molecules that range from large to ultra-small sizes. Larger molecules form a moisture-holding film on the surface, while lower-weight fractions penetrate more deeply to hydrate interior layers for a multi-level effect.

• 14-type hyaluronic acid complex targets both surface and deeper layers.
• Ultra-low molecular fraction (329 Da) designed for deeper penetration.
• Balanced formula prevents a heavy or sticky finish.

Will it feel heavy or interfere with my makeup?

The texture is lightweight and absorbs quickly, making it suitable for morning layering under sunscreen or makeup. Because the serum is designed to sink in without a greasy residue, it helps create a smooth base rather than altering product application.

• Fast-absorbing liquid consistency for quick layering.
• Leaves a smooth, non-oily finish that supports foundation application.
• Works well under creams, oils, and sunscreen.

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

The inclusion of mineral-rich sea water provides natural electrolytes and trace minerals that help the skin retain moisture and support barrier function. It complements the humectant action of hyaluronic acid for improved hydration retention.

• Sea water supplies natural minerals to help hold moisture.
• Supports skin’s hydration barrier alongside HA molecules.
• Integrates with other ingredients without aggressive additives.

Is this serum suitable for sensitive or vegan skincare routines?

Formulated without animal-derived ingredients, fragrances, and known harsh chemicals, the serum aims to be gentle and compatible with sensitive skin types. Patch testing is still recommended if you have very reactive skin or known ingredient sensitivities.

• Vegan-friendly, free from animal-derived components.
• No added fragrance—reduced irritation risk for sensitive skin.
• Minimalist approach helps layer with other gentle products.

Who is this for? ISNTREE Ultra-Low Molecular Hyaluronic Acid Serum suits anyone seeking effective, non-greasy hydration: people with dry or combination skin looking to boost moisture at multiple levels, those who prefer lightweight products compatible with makeup, and vegans or users avoiding fragrance and harsh additives. If you want a hydrating serum that layers well and focuses on both surface and deeper skin moisture, this serum fits into morning and evening routines.

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