B-Boost 1% Kojic Acid Serum
B-Boost 1% Kojic Acid Serum
Product Description
Product overview
Nineless B-Boost 1% Kojic Acid Serum is a Korean brightening treatment combining four pigmentation-fighting actives — 1% Kojic Acid, 10% Niacinamide, 2% Tranexamic Acid, and Glutathione — with a 6-peptide complex to fade dark spots, even skin tone, and firm aging skin. Free from alcohol, fragrance, and essential oils, this lightweight watery serum suits all skin types including sensitive skin.
Quad Brightening Action
Four pigmentation-fighting actives (Kojic Acid, Niacinamide, Tranexamic Acid, Glutathione) work synergistically to fade dark spots and uneven tone.
Texture & feel
SENSORYQuad Brightening Action
Four pigmentation-fighting actives (Kojic Acid, Niacinamide, Tranexamic Acid, Glutathione) work synergistically to fade dark spots and uneven tone.
6-Peptide Complex
Includes Hexapeptide-9, Acetyl Hexapeptide-8, and four palmitoyl peptides to firm skin, smooth fine lines, and accelerate cell repair.
Barrier Support
Hyaluronic acid, panthenol, and glycerin deliver deep hydration while soothing botanicals like bisabolol calm inflammation.
Sensitive-Friendly
Free from alcohol, fragrance, essential oils, and artificial colorants — formulated to minimize irritation for reactive skin.
Safety & compatibility
SAFEKojic Acid and Tranexamic Acid lack conclusive safety data during pregnancy. Consult your OB/GYN before use.
No problematic fatty acids, esters, or polysorbates. Safe for those prone to fungal acne breakouts.
Lightweight, oil-free formula rated 1/5 — won't clog pores or contribute to breakouts.
Contains Ascorbyl Glucoside (Vit C derivative). Avoid layering with strong L-Ascorbic Acid to prevent irritation.
Niacinamide pairs well with retinol — use serum AM and retinol PM, or alternate nights.
Brightening actives increase photosensitivity. Always apply SPF 30+ during the day to prevent re-pigmentation.
Kojic Acid can cause irritation in sensitive skin. Test on inner forearm for 48 hours before facial use.
Korean brand following EU cruelty-free standards — no animal testing.
Ingredient breakdown
INGREDIENTSKojic Acid 1%Proven
Derived from fermented rice and mushrooms (Aspergillus oryzae). Inhibits tyrosinase, the enzyme responsible for melanin production, effectively fading dark spots, melasma, and post-inflammatory hyperpigmentation (PIH).
- Mechanism: Tyrosinase inhibitor that blocks the enzyme needed to start skin darkening
- Effective range: 1-4%, with 1% being the gentlest concentration to minimize irritation
- Bonus: Antifungal and antibacterial properties also help with acne
Niacinamide 10%Proven
Vitamin B3 in a high 10% concentration — effective for sebum regulation, pore minimization, hyperpigmentation, and barrier repair. Strengthens skin's natural ceramide production.
- Source: Solid clinical evidence supports its role in barrier repair, oil regulation, and reducing pigmentation
- Concentration: 4-6% effective for acne and oil; 10% targets dark spots and pore appearance
- Synergy: Reinforces tranexamic acid and kojic acid in fading discoloration
Tranexamic Acid 2%Proven
A synthetic amino acid derivative dermatologically prescribed for stubborn melasma. Interrupts plasmin signaling between keratinocytes and melanocytes to prevent UV-induced pigmentation.
- Clinical use: Originally a prescription drug for bleeding; topical 2-5% effective for melasma
- Best for: Hormonal pigmentation, melasma, and post-inflammatory dark spots
- Bonus: Anti-inflammatory and soothing — calms redness alongside brightening
Glutathione ~0.5-1%Promising
Master antioxidant tripeptide composed of L-cysteine, L-glutamic acid, and glycine. Shifts melanin production from darker eumelanin to lighter pheomelanin, lightening overall skin tone over time.
- Mechanism: Inhibits tyrosinase indirectly via antioxidant action against free radicals
- Synergy: Works alongside Vitamin C derivatives for enhanced brightening
- Topical efficacy: Better absorbed in stable, well-formulated serums like this one
6-Peptide Complex ~1%Promising
Hexapeptide-9, Palmitoyl Pentapeptide-4, Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7, Acetyl Hexapeptide-8, and Nonapeptide-1 work as cell-communicating signals to firm, smooth, and lighten skin.
- Acetyl Hexapeptide-8 (Argireline): Reduces expression line depth
- Palmitoyl peptides: Stimulate collagen and elastin production
- Nonapeptide-1: Specifically reduces melanin production for added brightening
Sodium Hyaluronate & Panthenol Multi%Proven
Sodium Hyaluronate (low molecular weight HA) holds up to 1000x its weight in water; Panthenol (Vitamin B5) deeply moisturizes, soothes, and accelerates wound healing.
- Hydration boost: Counteracts potential drying from kojic acid
- Barrier repair: Panthenol reinforces skin's protective lipid layer
- Soothing: Reduces redness and irritation from active ingredients
Botanical Soothers Multi%Promising
Bisabolol (chamomile), Phellodendron Amurense Bark, Astragalus Root, Scutellaria Baicalensis, Coptis Chinensis, and Dipotassium Glycyrrhizate (licorice) form an anti-inflammatory botanical complex.
- Bisabolol: Active component of chamomile, calms irritation
- Licorice (Glycyrrhizate): Inhibits tyrosinase — bonus brightening boost
- TCM herbs: Traditional anti-inflammatory and antioxidant blend
35 ingredients
Water, Niacinamide, Methylpropanediol, Glycerin, Panthenol, Tranexamic Acid, 1,2-Hexanediol, Kojic Acid, Hippophae Rhamnoides Extract, Ascorbyl Glucoside, Dipropylene Glycol, Hydroxyacetophenone, Glutathione, Butylene Glycol, Caprylyl Glycol, Carbomer, Arginine, Tocopherol, Glycereth-26, Disodium EDTA, Betaine, Phellodendron Amurense Bark Extract, Astragalus Membranaceus Root Extract, Scutellaria Baicalensis Root Extract, Coptis Chinensis Root Extract, Bisabolol, Dipotassium Glycyrrhizate, Sodium Hyaluronate, Ethylhexylglycerin, Hexapeptide-9, Palmitoyl Pentapeptide-4, Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7, Acetyl Hexapeptide-8, Nonapeptide-1.
Where it fits in your routine
ROUTINEApply after toner/essence, before heavier creams. Use AM & PM. SPF 30+ is non-negotiable in the morning.
How to use
HOW TO USECleanse & Tone
Start with a clean, slightly damp face. Apply your favorite hydrating toner first.
Dispense 3-4 Drops
Use the dropper to apply 3-4 drops to fingertips or directly onto face — focusing on dark spots and uneven areas.
Pat & Press
Gently pat (don't rub) until fully absorbed. Lightweight texture sinks in within 15-30 seconds.
Layer Moisturizer
Seal in actives with your moisturizer to lock in hydration and prevent transepidermal water loss.
SPF 30+ in the Morning
Always finish with broad-spectrum SPF 30 or higher. Brightening actives make skin sensitive to UV.
Who is it for?
WHOPerfect for you if:
- You have dark spots, melasma, or post-acne marks (PIH)
- You want a multi-active brightening serum without harsh acids
- You have oily, combination, or normal skin
- You're looking for sensitive-skin-friendly K-beauty
- You want anti-aging benefits alongside brightening
- You prefer fragrance-free, alcohol-free formulas
Consider alternatives if:
- You're pregnant or breastfeeding (consult doctor)
- You have very dry skin needing rich moisturization alone
- You're sensitive to kojic acid (rare allergy)
- You can't commit to daily SPF use
- You want overnight/instant results
- You have severe rosacea or active eczema flares
Skin type compatibility
SKIN TYPESWatery, lightweight texture absorbs without adding shine. 10% niacinamide also regulates oil production.
Hyaluronic acid and glycerin hydrate, but layer a richer moisturizer on top for added moisture retention.
Balances both zones — controls oil in T-zone while hydrating drier cheek areas with HA and panthenol.
Fragrance-free and alcohol-free with bisabolol and licorice for soothing. Patch test recommended due to kojic acid.
Non-comedogenic, fungal-acne safe. Niacinamide and kojic acid have antibacterial benefits — ideal for fading PIH.
6-peptide complex addresses fine lines and firmness while brighteners fade age spots — true multi-tasker.
Results timeline
WEEKS 8-12Hydration & Glow
Skin feels softer, more hydrated, and appears more luminous. Texture begins to smooth.
85% noticedSkin Tone Evens Out
Mild redness and uneven tone start to fade. Skin looks calmer and more balanced.
72% noticedDark Spots Visibly Fade
Post-acne marks and superficial pigmentation lighten. Overall complexion looks brighter.
68% noticedMelasma & Stubborn Spots
Deeper pigmentation including melasma shows visible improvement. Skin firmness improves from peptides.
58% noticedRatings by platform
1K+ REVIEWSPros & cons
BALANCEDPraised
- Visibly fades post-acne marks (PIH) within 4-6 weeks
- Lightweight watery texture suits oily skin perfectly
- Four brightening actives in one formula — excellent value
- Fragrance-free and gentle on sensitive skin
- Bonus 6-peptide complex adds anti-aging benefits
- Layers easily under sunscreen and makeup
- Zero pilling or sticky residue
- Non-comedogenic, fungal-acne safe
Criticized
- 30ml runs out fast with twice-daily use
- Less effective for deep melasma than prescription options
- Mild tingling on first uses for very sensitive skin
- Requires 6-8 weeks for visible dark spot fading
- Glass dropper packaging less travel-friendly
- Not pregnancy-safe (kojic + tranexamic acid)
- Limited availability in Western retailers
Budget-friendly alternatives (dupes)
DUPESSingle-active brightening with arbutin instead of kojic acid blend. Lacks niacinamide, peptides, and tranexamic acid — pair with another product for similar coverage.
Same niacinamide concentration with double the tranexamic acid (4% vs 2%), but no kojic acid or full peptide complex. Slightly more aggressive brightening focus.
Tranexamic acid + niacinamide pairing at lower price. Lacks kojic acid, glutathione, and peptides — purely focused on pigmentation correction.
Higher-strength sea buckthorn extract (75%) with vitamin C. Different mechanism — antioxidant-led rather than tyrosinase-blocking blend. Richer cream texture.
Comparison with competitors
SIDE-BY-SIDEStorage & shelf life
12 MONTHS12 months after opening — finish within a year of first use
Store in a cool, dry place away from direct sunlight. Avoid bathroom humidity. Refrigeration optional but extends shelf life.
Glass bottle with dropper applicator — protects formula from oxidation but exposed to light during use.
Yes — 30ml is well under the 100ml TSA limit. Glass bottle requires careful packing.
Frequently asked questions
FAQUse with caution. While the product is free of retinoids, salicylic acid, and hydroquinone, both Kojic Acid and Tranexamic Acid lack robust safety data during pregnancy and breastfeeding. Most dermatologists recommend pausing brightening serums during these periods. Consult your OB/GYN or dermatologist before use. As pregnancy-safe alternatives, consider azelaic acid or vitamin C-based serums.
Yes — this serum is fungal acne (Malassezia) safe. The formula does not contain problematic fatty acids (caprylic/capric acids over C11), polysorbates, or fermented oils that typically feed Malassezia yeast. The water-based formula with hyaluronic acid, niacinamide, and peptides is well-tolerated by those prone to fungal acne breakouts.
Yes, with strategic layering. Pair with retinol by using B-Boost in the AM and retinol at night. With strong L-Ascorbic Acid Vitamin C, alternate days to avoid irritation (the serum already contains Ascorbyl Glucoside, a Vitamin C derivative). With AHAs/BHAs, separate by 30 minutes or use exfoliants on alternate evenings. Always introduce new actives gradually.
It works for all skin types but performs best for oily, combination, and acne-prone skin thanks to its lightweight watery texture and 10% niacinamide. Sensitive skin tolerates it well due to the fragrance-free, alcohol-free formula and soothing botanicals (bisabolol, licorice). Dry skin types should layer a richer moisturizer on top. Mature skin benefits from the bonus 6-peptide complex.
Initial hydration and glow appear within 1 week. Skin tone evens out at 2-4 weeks. Visible dark spot fading typically begins at 4-6 weeks of consistent twice-daily use. Stubborn melasma and deeper hyperpigmentation may need 8-12 weeks. Daily SPF 30+ is essential — skipping sunscreen will completely undo brightening progress.
Apply after cleansing, toner, and essence — before moisturizer. The standard order is: Cleanser → Toner → Essence → B-Boost Serum → Moisturizer → Sunscreen (AM only). Use morning and evening for best results. The watery texture absorbs in 15-30 seconds, so you can layer subsequent products quickly without waiting.
No, this serum is rated 1/5 on the comedogenic scale, making it non-comedogenic and safe for acne-prone skin. The formula is oil-free, silicone-free, and doesn't contain heavy occlusives. Niacinamide actually helps regulate sebum production and minimize pore appearance. The lightweight watery texture ensures no buildup or clogging.
The Period After Opening (PAO) is 12 months. Use within one year of opening for maximum potency, as kojic acid and ascorbyl glucoside can degrade over time when exposed to light and air. Store in a cool, dry place away from direct sunlight. Discard if you notice color changes (darkening), separation, or off-smells. Refrigerating extends shelf life and provides a cooling sensation on application.
Verdict: Nineless B-Boost 1% Kojic Acid Serum is one of the most comprehensive K-beauty brightening serums on the market — combining four proven pigmentation-fighting actives (Kojic Acid, Niacinamide, Tranexamic Acid, Glutathione) with a bonus 6-peptide anti-aging complex. The lightweight, fragrance-free formula suits all skin types including sensitive and acne-prone. Best for those with post-acne marks, sun spots, or melasma seeking a multi-active solution. Patience is key (6-8 weeks for visible results), and daily SPF is non-negotiable. The 30ml size and limited Western availability are the main drawbacks. Excellent value for an effective, well-formulated treatment.
Product Overview
Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.
Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.
Quick Product Notes
Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging «promises» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.
We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.
Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.
Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you
Notable Effects & Ingredients
Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.
We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.
A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.
One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!
Ingredients Related to Skin Types
Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.
EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.
Ingredient Safety Breakdown
Product ingredient list
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
| 1 |
Water
Solvent, Skin Conditioning
|
|
|
| 1 |
Niacinamide
Skin Conditioning, Hair Conditioning, Smoothing
|
Promotes Wound Healing
Redness
Irritation
Dark Spots
Pores
|
|
| 1 |
Methylpropanediol
Solvent
|
|
|
| 2 |
Glycerin
Solvent, Perfuming, Fragrance, Humectant, Viscosity Decreasing Agent, Hair Conditioning, Skin Protecting, Denaturant, Skin Conditioning
|
Promotes Wound Healing
Hydrating
|
|
| 1 |
Panthenol
Skin Conditioning, Antistatic Agent, Hair Conditioning
|
Promotes Wound Healing
Hydrating
Redness
Irritation
|







