ONE THING Niacinamide Glutathione Serum
By Nur → Last verified 9/29/2026
Price checked 9/29/2026
List price $35.00. 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
- + 2025 Glowpick Beauty Awards, best brightening essence/serum, 1st place
- + Confirmed fragrance-free
Worth knowing
- - Hero concentrations (50,000ppm niacinamide) come from iHerb's packaging listing, not the primary retailer page
Key ingredients
These are the ingredients ONE THING 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 (5%) | Vitamin B3 at a concentration within the most clinically studied range. | Supports the skin barrier and has published evidence for visibly reducing hyperpigmentation at this dose. |
| 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. |
| Glutathione | An antioxidant naturally produced by the body, also used topically in some brightening formulas. | Helps neutralize free radicals and is marketed for brightening, though topical absorption and efficacy are less established than oral or injectable use. |
| 3-O-Ethyl Ascorbic Acid | A more stable, gentler derivative of vitamin C. | Converts to active vitamin C once in the skin; brightens and fights free radicals with less irritation risk than pure ascorbic acid. |
| Ascorbic Acid | Pure vitamin C, the classic reference form and among the most extensively studied, though prone to oxidizing (degrading) once opened. | A strong antioxidant that helps brighten and even skin tone; actual potency depends heavily on concentration, pH, and formulation, which isn't always disclosed, so it isn't automatically stronger than a stable derivative at an adequate dose. |
| 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
ONE THING's own marketing claims, not our own findings.
- Contains 50,000ppm Niacinamide and Citrus Unshiu Peel ingredients to help suppress melanin level and brighten up dull complexion
- Formulated with Glutathione to brighten up skin tone
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 ONE THING Niacinamide Glutathione Serum cost per mL?
$0.50 per mL (currently $25.00 for 50 mL).
Has ONE THING Niacinamide Glutathione 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 ONE THING Niacinamide Glutathione Serum?
The ingredients ONE THING highlights for this product include Niacinamide (5%), Adenosine, Glutathione, 3-O-Ethyl Ascorbic Acid, Ascorbic Acid, Tocopherol.
Sources
Pricing and availability for this product were verified against the following retailer listings.