numbuzin No.5+: Korea vs US Price Comparison
Quick Summary: numbuzin No.5+ Vitamin Concentrated Serum Korea vs US Price
The numbuzin No.5+ Vitamin Concentrated Serum duo set delivers high-concentration glutathione (a notoriously unstable ingredient) in a stabilized formula with 50,000ppm niacinamide and 40,000ppm tranexamic acid for melanin inhibition and scar reduction. This 60mL total volume set retails for $27.30 at Olive Young Korea versus approximately $42-48 for individual 30mL bottles on US platforms—a savings of 35-43% when purchasing from Korea. With 3,426 reviews on Olive Young and bestseller status, this is a proven performer for hyperpigmentation and post-inflammatory erythema.
Price Comparison: Korea vs United States
| Retailer | Product Size | Price (USD) | Price per mL |
|---|---|---|---|
| Olive Young Korea | 30mL × 2 (60mL total) | $27.30 | $0.46 |
| Amazon US (Est.) | 30mL × 2 (if available) | $42.00-48.00 | $0.70-0.80 |
| YesStyle/K-Beauty US | 30mL single | $24.00-28.00 | $0.80-0.93 |
| Savings when buying from Korea | 35-43% ($14.70-20.70) | ||
What Makes This Serum Stand Out
Glutathione’s reputation as a powerful antioxidant is undermined by its stability issues and sulfurous odor—most brands avoid high concentrations. numbuzin solved this with an “antioxidant network” approach: encapsulated glutathione capsules suspended in a vitamin-rich base containing B5 (panthenol at 5%), B12, C, and E. This network allows vitamins to undergo oxidation-reduction cycles that preserve glutathione efficacy while improving skin penetration.
The clinical data backing this formula is specific: inner skin melanin decreased 23.72% after four weeks, with outer melanin reduced 9.65%. Skin evenness improved 18.90%, and the brand claims 95.24% pigmentation improvement—though this likely refers to user satisfaction surveys rather than colorimeter measurements. The 0.00 irritation index from third-party testing addresses the common concern that high-strength brightening actives cause sensitivity.
The supporting cast of actives works synergistically. Tranexamic acid at 40,000ppm (4%) inhibits plasmin activity to prevent melanin synthesis triggered by UV exposure and inflammation. Niacinamide at 50,000ppm (5%) blocks melanosome transfer from melanocytes to keratinocytes. Alpha-arbutin provides tyrosinase inhibition, while 604,074ppm lingonberry extract (Vaccinium vitis-idaea) delivers polyphenols for additional antioxidant support. Bisabolol from chamomile calms inflammation that can trigger post-inflammatory hyperpigmentation.
Reviewers on Olive Young consistently mention visible fading of acne scars within 2-3 weeks and improved skin clarity without the dryness typical of vitamin C serums. The dual-bottle format encourages consistent use—critical for pigmentation treatment, which requires 8-12 weeks minimum for melanin turnover.
Who Should Use This Serum
This serum targets post-inflammatory hyperpigmentation, melasma, sun spots, and uneven skin tone across all skin types. The 5% panthenol concentration makes it suitable even for sensitive skin prone to irritation from brightening actives. Oily and combination skin types handle the viscous texture well; dry skin may need additional moisturizer layering.
Ideal candidates include those dealing with stubborn acne scarring, hormonal pigmentation, or cumulative sun damage. The product works for both surface discoloration and deeper dermal melanin deposits—the clinical data showing 23.72% improvement in inner skin melanin suggests penetration beyond the epidermis.
Use this as your treatment serum step after toner/essence and before moisturizer. Apply once daily, preferably at night, though the formulation is stable enough for morning use if followed by SPF 50+. For optimal results, the brand recommends a double-layer application: one thin layer absorbed fully, followed by a second layer on areas of concern. Position this before heavier creams but after watery essences in a standard K-beauty 10-step routine.
How to Buy from Korea
Olive Young Global ships this duo set internationally with typical delivery times of 7-14 days to the United States. Shipping costs vary by order total, but bulk purchases often qualify for reduced rates. The Korean domestic version may contain fragrance or preservative systems that differ slightly from reformulations for Western markets, though active ingredient concentrations remain consistent. Check the ingredient list on Olive Young’s English-language site for the current formulation.
Purchase timing matters: Olive Young runs frequent promotions (1+1 deals, brand discount weeks) that can reduce the per-unit cost further. Sign up for their newsletter to catch sales that drop prices an additional 20-30%.
The Bottom Line
At $0.46 per milliliter from Korea versus $0.70-0.93 in the US, the numbuzin No.5+ Vitamin Concentrated Serum duo represents substantial value for a clinically-backed brightening treatment. The 35-43% savings justify the 1-2 week shipping wait, especially for a product requiring months of consistent use. The stabilized glutathione technology and comprehensive antioxidant network address hyperpigmentation through multiple pathways—melanin synthesis inhibition, inflammation reduction, and free radical neutralization. For anyone committed to fading stubborn dark spots or preventing new pigmentation, this is a data-driven choice at a Korea-direct price that makes long-term treatment affordable.