coeternal Deep Moisture Serum — Hydrating K‑Beauty Face Serum 50ml, Algae11 + Niacinamide for Barrier Repair & Glass Skin

Coeternal Deep Moisture Serum is a lightweight, fragrance-free K‑Beauty serum that delivers fast, long-lasting hydration and helps reinforce the skin barrier using Algae11, niacinamide, and arginine.

This 50ml serum blends an 11‑algae complex with proven skin‑friendly actives to restore moisture, calm sensitivity, and create a luminous, glass‑skin finish without heaviness or pore‑clogging oils. Designed for everyday use morning and night, the water‑based formula absorbs quickly and layers smoothly under sunscreen or makeup, making it a practical step for dry or reactive skin types seeking sustained hydration and improved texture.

How quickly will I notice more hydration after using this serum?

Users typically feel an immediate increase in skin moisture thanks to fast-absorbing humectants and the Algae11 complex. Continued nightly use supports more resilient, plump skin over several weeks as barrier‑supporting ingredients take effect.

• Immediate: lightweight, non-sticky hydration on first application
• 2–4 weeks: improved softness and apparent skin elasticity
• Ongoing: helps maintain moisture when layered with cream or sunscreen

What makes Algae11, niacinamide, and arginine work well together?

Algae11 is a concentrated blend of marine extracts chosen for water retention and soothing properties; niacinamide helps regulate skin tone and supports barrier repair; arginine contributes amino‑acid support for natural moisture retention. Combined, they deliver complementary benefits: hydration, calmness, and structural support.

• Algae11: multi‑algae hydration and soothing benefits
• Niacinamide: reduces visible redness and supports barrier function
• Arginine: an amino acid that helps lock in moisture and resiliency

Will this serum clog pores or irritate sensitive skin?

The formula is water‑based and non‑comedogenic, formulated without fragrance, parabens, or drying alcohols to minimize irritation risks. Its lightweight texture layers well under other products, so it works for sensitive or reactive skin when introduced gradually.

• Fragrance‑free: reduces risk of scent-related irritation
• Non‑comedogenic: safe under makeup and sunscreen
• Gentle ingredients: suitable for post-treatment and reactive skin

How do I incorporate Coeternal Deep Moisture Serum into my routine?

Apply to clean, slightly damp skin to maximize absorption, then follow with a moisturizer and SPF in the morning. Use it both AM and PM; increase frequency as tolerated to build hydration and support barrier health over time.

• Mornings: serum → moisturizer → SPF
• Evenings: serum → richer cream or sleeping mask for dry skin
• Tip: layer on damp skin for best humectant performance

Who is this for: Coeternal Deep Moisture Serum is aimed at people with dry, dehydrated, or easily irritated skin who want a lightweight, fast‑absorbing hydrator that layers under makeup. It also suits anyone seeking a fragrance‑free K‑Beauty product that combines marine extracts with skin‑supporting actives to improve moisture, comfort, and surface glow without heavy oils or pore‑clogging ingredients.

Ingredients

WATER, CAPRYLIC/CAPRIC TRIGLYCERIDE, DIPROPYLENE GLYCOL, GLYCERIN, NIACINAMIDE, 1,2-HEXANEDIOL, METHYL GLUCETH-20, CAULERPA LENTILLIFERA EXTRACT, CHLORELLA VULGARIS EXTRACT, CODIUM FRAGILE EXTRACT, ECKLONIA CAVA EXTRACT, FUCUS VESICULOSUS EXTRACT, GELIDIUM CARTILAGINEUM EXTRACT, HIZIKIA FUSIFORME EXTRACT, LAMINARIA CLOUSTONI EXTRACT, LAMINARIA JAPONICA EXTRACT, MACROCYSTIS PYRIFERA (KELP) EXTRACT, ULVA LACTUCA EXTRACT, POLYGLYCERYL-3 METHYLGLUCOSE DISTEARATE, VINYL DIMETHICONE, GLYCERYL CAPRYLATE, HYDROGENATED LECITHIN, SORBITAN STEARATE, ARGININE, CARBOMER, AMMONIUM ACRYLOYLDIMETHYLTAURATE/VP COPOLYMER, ADENOSINE, BUTYLENE GLYCOL, DISODIUM EDTA