numbuzin No.6 Deep Sleep Mask Serum
By Nur → Last verified 9/29/2026
Price checked 9/29/2026
List price $28.00. Price-checked 2026-09-29.
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What we found
Based on how this product compares to others in the serums category, cross-referenced against retailer listings and market data.
Strengths
- + 2023 Glowpick Beauty Awards, best moisturising essence/serum, 2nd place
- + Confirmed fragrance-free
Worth knowing
- - No concentration stated for the non-water hero ingredients beyond the 63% glacial water figure
Key ingredients
These are the ingredients numbuzin highlights for this product, cross-checked against general dermatological and cosmetic-chemistry sources, not a full INCI list.
Fragrance: confirmed fragrance-free.
| Ingredient | What it is | What it does for skin |
|---|---|---|
| Niacinamide | A form of vitamin B3, one of the most studied ingredients in cosmetic dermatology. | Strengthens the skin barrier by boosting ceramide production, helps even out tone by limiting pigment transfer to skin cells, and can reduce the look of enlarged pores. |
| Sodium hyaluronate | The salt form of hyaluronic acid, commonly used for its water solubility and stability in formulas; molecular weight varies by product rather than being uniformly smaller. | Draws and holds moisture the same way hyaluronic acid does; how easily it absorbs depends on the specific molecular weight used, which formulas don't always disclose. |
| Hydrolyzed Hyaluronic Acid | Hyaluronic acid broken down into smaller fragments for easier absorption. | Delivers hydration to the skin's upper layers more readily than larger-molecule hyaluronic acid. |
| Hyaluronic acid | A humectant naturally found in skin, capable of holding many times its weight in water. | Draws moisture into the skin's surface, helping it look and feel plumper and more hydrated. |
| Panthenol | Pro-vitamin B5, which converts to pantothenic acid once absorbed into skin. | Hydrates as a humectant, supports wound healing, and has anti-inflammatory, soothing effects on irritated skin. |
| Adenosine | A compound naturally present in skin cells, used in skincare as an anti-aging active. | Recognized by South Korea's MFDS as a functional anti-wrinkle ingredient at 0.04% concentration, based on clinical studies showing measurable fine-line improvement; a real but modest effect, not a retinoid substitute. |
| Tocopherol | The chemical name for vitamin E as typically used in skincare formulas. | Helps neutralize free radicals from UV and pollution exposure and supports the skin's moisture barrier. |
What the brand says
numbuzin's own marketing claims, not our own findings.
- Containing 63% glacial water sourced from Iceland plus hyaluronic acid and niacinamide, the bestselling product moisturizes and brightens skin for a plump and supple finish
Research-Based
Our assessment comes from pricing, ingredients, and published information, not personal use, the same standard we apply across the site. This product hasn't been hands-on tested yet. See our Methodology for what that distinction means.
Price history
Current price is the lowest we've recorded so far.
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Frequently asked
How much does numbuzin No.6 Deep Sleep Mask Serum cost per mL?
$0.34 per mL (currently $16.80 for 50 mL).
Has numbuzin No.6 Deep Sleep Mask Serum been hands-on tested?
Not yet. Our assessment for this product comes from pricing, ingredients, and published information, not personal use, the same standard we apply across the site. See our Methodology for what that distinction means.
What are the key ingredients in numbuzin No.6 Deep Sleep Mask Serum?
The ingredients numbuzin highlights for this product include Niacinamide, Sodium hyaluronate, Hydrolyzed Hyaluronic Acid, Hyaluronic acid, Panthenol, Adenosine, Tocopherol.
Sources
Pricing and availability for this product were verified against the following retailer listings.