Finished-formula comparison
8 Dark Spot Serums Compared: TXA, Alpha Arbutin, Niacinamide and Value
The meaningful difference between these serums is not simply price or the largest percentage on the label. Each formula has a different power area: the concern, skin context and routine role where its complete formula is most useful.
Prices, sizes, sellable status and official product media were rechecked in the ProtoClinical catalog on August 5, 2026. Cost per use models 0.20 ml and excludes shipping, duties and tax.
SKIN1004 is strongest for long-term value and repeatability. Anua and Medicube are strongest for high-disclosure, concentrated TXA stacks. COSRX is strongest for a broad alpha-arbutin-led formula. Abib is strongest when brightening must coexist with dryness or barrier stress. AXIS-Y is strongest for oil-prone routines, Beauty of Joseon for a simpler dewy arbutin route, and numbuzin for dullness plus vitamin breadth.
Large 100 ml format, lowest cost per ml and moderate active density.
Brightening support with the clearest barrier and comfort framework.
5% niacinamide, squalane and a clear daily role for marks plus oil balance.
5% TXA in a dense premium formula, with the highest cost and routine burden.
How to read the comparison
“Power area” is formula utility, not a clinical potency score
A power area is where a product’s lead actives, supporting ingredients, texture, size and routine demands form the clearest use case. It does not mean the product is proven to fade a mark faster than another serum. It also does not make a higher-percentage formula universally stronger.
This distinction matters because a serum can be excellent at one job and inefficient at another. AXIS-Y has a stronger oil-and-pore role than Beauty of Joseon, but that does not make it the better choice for a dry routine. Abib has a stronger barrier context than Medicube, while Medicube has the higher disclosed TXA concentration. SKIN1004 has the strongest cost and consistency proposition even though it does not have the densest active stack.
Utility matrix
Where each product is strongest
“Primary” identifies a central formula job. “Strong” indicates meaningful secondary utility. “Support” means the product can contribute, but this is not the main reason to choose it. Routine simplicity and value are practical buying dimensions, not efficacy claims.
| Product | Post-blemish marks | Oil / pores | Dullness / radiance | Hydration / barrier | Routine simplicity | Value | Price per ml |
|---|---|---|---|---|---|---|---|
| SKIN1004 | Primary | Support | Support | Strong | High | Best | $0.16/ml |
| Abib | Strong | Low | Primary | Primary | High | Strong | $0.37/ml |
| Beauty of Joseon | Primary | Low | Strong | Support | Highest | Moderate | $0.44/ml |
| AXIS-Y | Strong | Primary | Support | Support | Highest | Strong | $0.29/ml |
| Anua | Primary | Strong | Support | Support | Moderate | Moderate | $0.66/ml |
| COSRX | Primary | Support | Strong | Support | Moderate | Strong | $0.39/ml |
| numbuzin | Strong | Support | Primary | Strong | Moderate | Moderate | $0.52/ml |
| Medicube | Primary | Strong | Strong | Support | Low | Low | $1.05/ml |
Concern-by-concern
The comparison changes when the concern changes
Persistent-looking post-blemish marks
Anua and Medicube are the clearest percentage-led choices because both disclose niacinamide, TXA and arbutin. Medicube raises TXA to 5%; Anua costs less and is easier to justify for most high-active shoppers. COSRX is the broader alpha-arbutin-led alternative when a 50 ml multi-pathway formula matters more than maximum TXA disclosure.
Marks plus oil or visible pores
AXIS-Y has the cleanest role when the routine needs a daily 5% niacinamide serum rather than a dense pigment stack. Anua and Medicube also contain 10% niacinamide, but their main purchase case is concentrated multi-active tone support, not routine simplicity.
Dullness and low radiance
numbuzin has the broadest vitamin-and-glutathione story. Abib is more useful when dullness exists beside dryness or barrier stress. Beauty of Joseon offers a narrower, dewy route for buyers who do not want several antioxidant and pigment-support ingredients in one formula.
Dry, dehydrated or over-treated skin
Abib has the strongest support architecture. SKIN1004 is the lower-cost, hydration-friendly TXA option. Beauty of Joseon is the simplest dewy choice. High-density formulas can still be used by dry skin, but only when the barrier is comfortable and the surrounding routine is deliberately plain.
Current price per ml
Exact catalog price divided by bottle volume. This does not account for dispenser output or formula freshness after opening.
Routine-management load
Editorial estimate of how much overlap and scheduling attention the formula requires. One block is narrow and easy to place; four blocks is dense and best used as the only tone serum.
Deep profiles
Eight products, with their power areas and limits
Each profile separates the official product image from the decision analysis, then compares the primary concern, secondary utility, skin fit, routine placement, compatible steps, overlap and tradeoffs.
Power area
SKIN1004 Tone Brightening Capsule Ampoule 100ml
Consistency, value and hydration-friendly TXA support
Why this is its strongest area. Choose it over Anua or Medicube when repeatability and cost matter more than the highest disclosed percentage.
Post-blemish marks when dryness, dehydration or routine fatigue are also concerns.
General uneven-looking tone and daily radiance support.
Normal, combination, oily-dehydrated and sensitive-leaning skin that tolerates niacinamide.
Best as the only tone serum in a simple morning or evening routine. The 100 ml size rewards consistent daily use.
Plain moisturizer, hydrating toner and daily sunscreen. A retinoid can be kept on alternate nights when needed.
Skip a second TXA or niacinamide serum. A large bottle is poor value for someone who rotates several treatments.
Main tradeoff. Its main advantage is the complete use proposition—size, texture and cost—not maximum active density.
View SKIN1004
Power area
Abib Glutathiosome Dark Spot Serum Vita Drop 50ml
Barrier-supported brightening for dry or over-treated routines
Why this is its strongest area. Choose it over numbuzin when barrier context and a 50 ml water-light format matter more than ingredient breadth alone.
Dullness and post-blemish marks in skin that also needs hydration and barrier support.
Radiance and smoother-looking finish without a high-percentage TXA stack.
Dry, dehydrated, normal and sensitive-leaning skin; especially useful after over-exfoliation has been resolved.
Works as one broad daily serum rather than a layer inside a multi-serum brightening routine.
Ceramide moisturizer, gentle retinoid schedule and sunscreen. Its supporting formula reduces the need for a separate antioxidant serum.
Do not interpret the branded 5% Glutathiosome and 5% PlusSome Vita C systems as 5% pure glutathione or 5% pure ascorbic acid.
Main tradeoff. It offers broad support, but it is less percentage-led than Anua or Medicube.
View Abib
Power area
Beauty of Joseon Glow Deep Serum: Rice + Alpha-Arbutin 30ml
Low-complexity alpha-arbutin route with a dewy finish
Why this is its strongest area. Choose it over COSRX when formula simplicity is more useful than covering several pigment-support pathways in one bottle.
Uneven-looking tone and post-blemish marks when the buyer wants a narrower formula.
Dry-skin radiance and a softer cosmetic finish.
Normal to dry skin, and routines that do not need oil-control support.
Easy to place in a simple evening routine or a calm morning routine under sunscreen.
Hydrating toner, moisturizer and sunscreen. It can sit beside a carefully scheduled retinoid because it does not already carry the densest active stack.
The currently audited official page does not disclose the alpha-arbutin percentage. Do not compare old percentage figures from third-party listings.
Main tradeoff. It is not the best choice for shoppers who want complete percentage disclosure or an oil/pore-oriented serum.
View Beauty of Joseon
Power area
AXIS-Y Dark Spot Correcting Glow Serum 50ml
Daily niacinamide for marks, oil balance and visible pores
Why this is its strongest area. Choose it over SKIN1004 when oil balance and visible pores matter more than TXA and maximum value per ml.
Post-blemish marks in combination or oily routines that also want oil and pore support.
Light hydration and everyday glow rather than a maximum-strength spot stack.
Combination, oily and normal skin; useful when a 5% niacinamide level fits better than a 10% formula.
Best as a daily AM or PM niacinamide serum when cleanser, moisturizer and sunscreen are the other main steps.
Salicylic acid on a controlled schedule, lightweight moisturizer and sunscreen. Retinoids can be used at a separate time if the routine remains comfortable.
Rosemary leaf oil is listed. 'No artificial fragrance' is not equivalent to an essential-oil-free formula.
Main tradeoff. Its power area is broader daily niacinamide utility, not the most targeted TXA or arbutin route.
View AXIS-Y
Power area
Anua Niacinamide 10% + TXA 4% Dark Spot Correcting Serum 30ml
Concentrated, fully disclosed multi-active route for stubborn-looking marks
Why this is its strongest area. Choose it over Medicube when you want a similar high-disclosure concept at a lower cost per ml and a watery finish.
Persistent-looking post-blemish marks and uneven tone when the routine can support a dense active formula.
Oil balance and overall tone support through niacinamide.
Normal, combination and oily skin with established leave-on active tolerance.
Use as the only dedicated dark-spot serum. A plain moisturizer and sunscreen make it easier to evaluate.
Hydrating steps, barrier moisturizer and daily sunscreen. Retinoids or acids are easier to manage on separate nights.
It already combines 10% niacinamide, 4% TXA and 2% arbutin. Adding more niacinamide, TXA, arbutin or strong exfoliation usually creates overlap rather than a clear new function.
Main tradeoff. High disclosure and active density do not guarantee better tolerance or faster results.
View Anua
Power area
COSRX The Alpha-Arbutin 2 Discoloration Care Serum 50ml
Broad multi-pathway discoloration support anchored by 2% alpha-arbutin
Why this is its strongest area. Choose it over Beauty of Joseon when formula breadth and the 50 ml size are more useful than minimalism.
Post-blemish marks for shoppers who want arbutin plus several supporting pathways in one 50 ml serum.
Dullness, hydration and antioxidant support.
Normal and combination skin with tolerance for complex leave-on formulas.
Best used as the single multi-active treatment serum in AM or PM.
Plain moisturizer and sunscreen. A retinoid can be alternated rather than stacked during introduction.
Alcohol is listed, and only alpha-arbutin is quantified on the audited official page. Do not assume the other headline ingredients are present at comparable percentages.
Main tradeoff. The broader formula is harder to troubleshoot if sensitivity develops.
View COSRX
Power area
numbuzin No.5+ Vitamin Concentrated Serum 30ml
Dullness and radiance through a broad vitamin-and-glutathione blend
Why this is its strongest area. Choose it over Abib when vitamin breadth and radiance are the main goals; choose Abib when barrier context is more important.
Dull-looking, uneven skin when the shopper prefers one broad antioxidant and tone-support formula.
Post-blemish marks and barrier support.
Normal, combination and dry skin that generally tolerates complex formulas.
Often easiest in the morning before moisturizer and sunscreen, replacing a separate vitamin C or glutathione serum.
Moisturizer and sunscreen. It can coexist with a retinoid used at night because it already fills the daytime antioxidant slot.
The audited official page names many actives but does not publish headline percentages. Do not buy it for concentration comparisons.
Main tradeoff. Breadth makes it less precise for buyers who want one disclosed lead active.
View numbuzin
Power area
MEDICUBE TXA Niacinamide 15% Serum 30ml
Highest disclosed TXA concentration and premium high-active stack
Why this is its strongest area. Choose it over Anua only when 5% disclosed TXA is a specific priority and the higher cost and formula density are acceptable.
Persistent-looking marks for experienced users who specifically prioritize a 5% TXA formula.
Oil balance, general uneven tone and multi-active support.
Normal, combination and oily skin with established tolerance and a deliberately simple surrounding routine.
Use as the only tone serum, introduce slowly and keep the rest of the routine plain.
Hydrating toner, basic moisturizer and sunscreen. Retinoids and acids should be added only after the serum is already comfortable, usually on separate nights.
Rose flower oil is listed. It also has the highest price per ml, and the product name's 15% refers to the combined niacinamide and TXA total—not 15% niacinamide.
Main tradeoff. The most expensive and highest-density option is not automatically the most useful for a sensitive or crowded routine.
View MedicubeCompatibility map
What can be used together—and what is usually redundant
Compatibility is not a binary ingredient rule. It depends on formula density, frequency and tolerance. The table below describes the most practical starting point for each product.
| Product | Retinoid | AHA / BHA | Separate vitamin C serum | Second dark-spot serum | Daily sunscreen |
|---|---|---|---|---|---|
| SKIN1004 |
Usually compatible Alternate if sensitive. |
Conditional Separate when dryness rises. |
Optional Only for a distinct antioxidant role. |
Usually skip Duplicates TXA/niacinamide. |
Essential |
| Abib |
Usually compatible Keep retinoid schedule conservative. |
Conditional Do not use acids to compensate for dullness. |
Usually skip Abib already fills the antioxidant slot. |
Skip Use Abib as the broad daily serum. |
Essential |
| Beauty of Joseon |
Usually compatible Separate times if needed. |
Conditional Introduce one change at a time. |
Possible Only if the routine stays comfortable. |
Usually skip A second arbutin/TXA serum obscures the test. |
Essential |
| AXIS-Y |
Usually compatible Retinoid can stay at night. |
Useful but scheduled BHA may address congestion separately. |
Possible AXIS-Y does not fill the vitamin C role. |
Usually skip Avoid repeated niacinamide. |
Essential |
| Anua |
Separate initially Alternate nights or AM/PM split. |
Separate The formula already has a dense tone stack. |
Usually skip Add only for a specific, tolerated reason. |
Skip It already covers TXA, arbutin and niacinamide. |
Essential |
| COSRX |
Alternate initially Complex formula plus retinoid can be harder to troubleshoot. |
Separate Assess alcohol-containing serum tolerance first. |
Usually skip Ferulic, glutathione and broad support are already present. |
Skip COSRX is already multi-pathway. |
Essential |
| numbuzin |
AM/PM split works Use numbuzin in the morning. |
Conditional Keep acids on selected nights. |
Skip It already occupies the vitamin/antioxidant role. |
Skip Formula already contains several tone routes. |
Essential |
| Medicube |
Separate initially Add only after the serum is comfortable. |
Separate High active density raises routine burden. |
Usually skip The formula already includes antioxidant support. |
Skip It is the densest dedicated tone serum here. |
Essential |
Routine examples
Four ways to use the comparison
Oily, congested, marked
- Gentle cleanser
- AXIS-Y daily, or SKIN1004 when TXA matters more
- Light moisturizer
- Broad-spectrum sunscreen
- BHA on selected nights, not automatically every day
Dry or barrier-stressed
- Low-foaming cleanser
- Abib as the broad serum, or Beauty of Joseon for a simpler route
- Barrier moisturizer
- Broad-spectrum sunscreen
- No exfoliant until the skin is comfortable
High-active, established tolerance
- Cleanser
- Anua or Medicube as the only dark-spot serum
- Plain moisturizer
- Broad-spectrum sunscreen
- Retinoid or acid on separate nights
Dullness plus uneven tone
- Gentle cleanser
- numbuzin in the morning, or Abib when dryness is prominent
- Moisturizer as needed
- Broad-spectrum sunscreen
- Retinoid can remain in the evening if tolerated
Limits that matter more than the ranking
None of these products can guarantee removal of melasma or another diagnosed pigmentary condition. New, changing, widespread or unexplained pigmentation needs professional assessment. Persistent burning, swelling, raw patches, increasing redness or marked peeling are reasons to stop adding actives and simplify the routine.
Read the TXA vs alpha-arbutin comparison or the TXA vs niacinamide comparison when the remaining decision is between ingredient routes.
FAQ
Questions to answer before buying
Which product has the strongest power area for post-blemish marks?
Which product is most useful for oily skin?
Which product is most useful for dry or sensitive-leaning skin?
Can I use one of these serums with a retinoid?
Should I use two dark-spot serums together?
Why is SKIN1004 called the best value if it is not the highest percentage?
Choose the product with the clearest job
Start with one lead serum, keep the surrounding routine plain, and evaluate comfort before adding another active.
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