iUNIK Beta Glucan Power Moisture Serum: A Fermented Hydration Serum for Barrier Support

iUNIK is a Korean indie brand built around minimal-ingredient formulations (typically 7 to 10 ingredients per product). The Beta Glucan Power Moisture Serum is the brand's hero hydrating serum, using beta-glucan (a fermented oat-derived molecule) as the primary active. At $29.02 for 50ml, it's priced at the accessible end of functional Korean serums. iUNIK's positioning competes directly with The Ordinary and similar minimalist brands but with Korean texture sensibility.

Beta-glucan is a well-studied skincare ingredient with documented benefits for hydration, barrier support, and wound healing. Its molecular structure provides hydration similar to hyaluronic acid but with additional barrier-calming benefits. Beta-glucan doesn't get as much mainstream attention as hyaluronic acid, but in K-beauty circles it's considered one of the under-appreciated hydrating ingredients. This serum features beta-glucan as the second ingredient by concentration, which is unusually high.

What It Does

Beta-glucan delivers deep hydration and supports the skin's natural barrier function through immune-related skin receptors. It's calming, which makes it excellent for sensitive or reactive skin. Additional hydrating ingredients (hyaluronic acid, niacinamide, panthenol in typical iUNIK formulations) support the hydration and brightening effects. The serum format sits well under any cream, with a light texture that doesn't conflict with other routine steps. For reactive or dehydrated skin, this is a gentle-but-effective daily serum.

Who It's For

• Dehydrated and dry skin: Primary hydration support.
• Sensitive or reactive skin: Beta-glucan is particularly calming.
• Minimalist skincare fans: Short ingredient list.
• Barrier-compromised skin recovery: Supports barrier function.
• Budget functional skincare: Accessible price, real actives.

Key Specs

• Volume: 50ml
• Price: $29.02
• Hero active: beta-glucan (high concentration)
• Texture: watery serum, light
• Ingredient count: minimal (around 10 ingredients)
• Use: morning and evening

How to Use

Apply after toner to slightly damp skin. Dispense 3 to 4 drops, pat into face and neck. Allow 30 seconds absorption, then follow with additional serums or moisturizer. Use morning and evening consistently. For maximum effect: apply to very damp skin for better hydration spread.

For layered hydration during dry phases: apply this first, then follow with a hyaluronic acid serum. The two work synergistically.

FAQ

What does beta-glucan actually do?

Beta-glucan is a polysaccharide that binds to skin receptors and triggers healing and hydration responses. It's a proven ingredient for hydration, barrier support, wound healing, and anti-aging at the cellular level. Studies show meaningful benefits at concentrations around 0.1% and above.

How does it compare to hyaluronic acid?

Complementary rather than competitive. Hyaluronic acid is a humectant that pulls water into skin. Beta-glucan is a humectant plus a calming-regenerative active. For pure hydration: HA. For hydration plus calming: beta-glucan. Many users stack both.

Will it break me out?

Very unlikely. Beta-glucan is non-comedogenic and widely tolerated by acne-prone skin. The minimal ingredient list reduces allergen exposure too.

How does this compare to The Ordinary HA serum?

Similar accessibility, different active focus. The Ordinary HA is $8 to $10, pure hyaluronic acid focus. iUNIK is $29, beta-glucan focus with added hydrating ingredients. The Ordinary is cheaper but plainer; iUNIK adds Korean formulation polish.

How long does 50ml last?

Twice daily use: 2 to 3 months. The dropper design helps pace usage.

Related Products

Pair with iUNIK Tea Tree Relief Serum for combined calming-brightening routine, or layer with a hyaluronic acid serum from the hyaluronic acid collection.

Browse the full iUNIK collection or related categories: Korean serums, Korean hydrating products.