IsNtree Hyaluronic Acid Serum 1.69 fl oz, 14-Type Ultra-Low Molecular HA, Lightweight Deep Hydration

ISNTREE Ultra-Low Molecular Hyaluronic Acid Serum is a lightweight Korean facial serum that delivers deep, layer-by-layer hydration using a 14-type hyaluronic acid complex and ultra-low molecular weight molecules.

This serum blends multiple sizes of hyaluronic acid with seawater minerals from Ulleung Island to hydrate, plump, and support the skin’s moisture barrier without a heavy or sticky finish. Designed for everyday use, it absorbs quickly and layers easily under moisturizers and makeup. The formula is vegan and free of fragrances and harsh additives, making it suitable for skin types that prefer minimal, effective hydration.

How does this serum hydrate deeper than a regular hyaluronic acid product?

The serum contains 14 distinct hyaluronic acid variants, including ultra-low molecular weight chains around 329 daltons that can penetrate into the upper dermal layers. Larger HA molecules sit on the surface to attract moisture while smaller ones travel deeper to retain hydration within the skin.

• 14-type hyaluronic acid complex targets multiple skin layers
• Ultra-low molecular weight HA for deeper penetration
• Surface HA forms a moisture-attracting film to prevent transepidermal water loss

Will the texture feel heavy or greasy on my skin?

This serum is formulated to be lightweight and fast-absorbing, so it layers smoothly under creams and makeup without tackiness. The finish is refreshing and slightly dewy, leaving skin comfortable rather than weighed down.

• Water-light serum base absorbs quickly
• Dries to a non-sticky, hydrated finish
• Works well in multi-step routines and under sunscreen

Why is Ulleung Island seawater included and what does it do?

Sea minerals from Ulleung Island add trace elements that help support the skin’s natural moisture retention and resilience. These minerals complement hyaluronic acid by strengthening the skin’s barrier, aiding in longer-lasting hydration.

• Natural sea minerals help fortify the moisture barrier
• Supports skin resilience and mineral balance
• Pairs with HA complex to improve hydration longevity

Is this serum suitable for sensitive or vegan skin routines?

The formula avoids animal-derived ingredients, added fragrances, and harsh chemicals, which reduces the likelihood of irritation for many sensitive skin types. Its minimal, skin-friendly composition makes it a practical option for those who prefer gentler, vegan skincare.

• Vegan formulation without animal-derived components
• Fragrance-free and free from common irritants
• Designed for easy layering in sensitive skin routines

Who is this for? This serum is aimed at anyone seeking lightweight but effective hydration—people with dehydrated, combination, or sensitive skin who want deeper moisture without heavy textures. It’s also a good pick for those building a clean, vegan skincare routine or anyone who wants a fast-absorbing hydrating step before moisturizer and sunscreen. Use it morning and night after cleansing and before heavier creams for best results.

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