It may not be as well-known as headline-stealing skincare ingredients like vitamin C or azelaic acid, but kojic acid has long been improving the appearance of dark spots and hyperpigmentation in a wealth of brightening formulas. The skincare hero originated in Japan in the 1980s and is now enjoying a moment in the spotlight – no doubt due to brands like K-beauty favourite Medicube, which highlights its performance in masks, serums and pore pads.
Vogue’s top kojic acid skincare at a glance:
One of dermatology’s most effective topical ingredients for fading stubborn dark spots, melasma and pigmentation, kojic acid is also attributed with improving the look of uneven skin tone, post-inflammatory pigmentation from acne and leaving a healthy glow. It is included in skincare products to work over time and always always to be followed by SPF. But what exactly is it, and can it be used by all skin types?
According to Korean skincare expert dermatologist Dr Christine Hall, “Kojic acid is a naturally derived metabolite produced by certain fungi.” She continues, “Its primary function in skincare is the inhibition of tyrosinase, an essential enzyme in the synthesis of melanin – the pigment produced in our skin. By interrupting this enzymatic pathway, kojic acid effectively reduces pigment production. This mechanism distinguishes it from other brightening agents, as it directly blocks the biochemical reaction required for melanin formation.”
For those struggling with melasma, acne marks, or sun spots, kojic acid may be an effective solution. Dr Hall reveals, “Kojic acid has demonstrated efficacy in treating multiple forms of hyperpigmentation, including post-inflammatory hyperpigmentation and melasma. Its dual action, both inhibiting melanin production and contributing to overall skin brightening, makes it a versatile option in pigment management.” That being said, she advises that it is not as effective for indented or textured acne scars, such as ice-pick or boxcar scarring, highlighting its discolouration-improving properties as the one to note.
She adds that kojic acid is considered suitable for oily, dry, combination, and acne-prone skin. However, those with sensitive or reactive skin should introduce it cautiously. “Kojic acid is generally well tolerated across most skin types. However, as with any active ingredient, those with sensitive or reactive skin should proceed with caution. Patch testing is advisable, and gradual introduction is key to minimising the risk of irritation or barrier disruption.”
When it comes to effectiveness, leave-on products outperform cleansers, while application order depends on the formulation. As for the products that layer well, Dr Hall recommends a strategic approach, alternating with actives like retinol, vitamin C and glycolic acid, and sticking to calming ingredients like niacinamide when using. To deep dive further, scroll on for the answers to our burning questions and the formulas to incorporate kojic acid into your skincare routine.
- Jump to the product reviews
- How long will it take to see results from kojic acid?
- What concentration of kojic acid is safe and effective?
- What are the side effects of kojic acid?
- Should I use kojic acid as a serum, cream, or cleanser?
- How often should I apply kojic acid and when?
- Can I combine it with actives like retinol, vitamin C, or salicylic acid? What is best layered with it?
- Meet the experts
Medicube
Kojic Acid Tumeric Overnight Wrapping Mask
- Why it’s Vogue-approved: If you have used the viral Medicube collagen mask, you’ll immediately notice that this kojic acid-based option has much the same application. You apply the gel-like texture all over your face, leave for 15 minutes at minimum and peel it off in a satisfying reveal. You can also use it overnight, where over the course of eight hours, it brightens the skin with the benefits of kojic acid, the smoothing of collagen and the supportive properties of tumeric so that you actually look well-rested when you wake up. These results have been clinically tested. Glowy glass skin here we come.
- Key ingredients: Kojic acid, turmeric and vitamin C
Allies Of Skin
Azelaic & Kojic Advanced Clarifying Serum
- Why it’s Vogue-approved: A veritable superpowered serum, this beloved clarifying formula by Allies of Skin is gentle yet designed to improve the appearance of (deep breath): enlarged pores, blackheads, whiteheads, excess sebum, rough skin texture, uneven tone, dark spots, post-blemish hyperpigmentation and dullness. Due to its powerful actives, it’s important to always follow up with SPF during the daytime. It’s nevertheless incredibly calming (thanks to aloe and allantoin), hydrating and glow-boosting – serving as the perfect addition to your summer skincare routine when excess oil tends to leave one looking dull and clogged.
- Key ingredients: Aloe leaf juice, azelaic acid, radish root, kojic acid, bakuchiol, liquorice extract, allantoin
Bubble
Over Night Hydrating Sleep Mask
- Why it’s Vogue-approved: A well-formulated and affordable overnight mask, try this if you're looking for boosted hydration and a more refined skin texture. Designed to be used once or twice a week, it contains a gentle acid complex to slough away dead cells and promote fresher-looking skin, as well as moisture-binding ingredients and arnica to soothe redness and inflammation.
- Ingredients: Maple sap, mandelic acid, kojic acid, sodium PCA, biosaccharide gum, arnica
Topicals
Faded Brightening & Clearing Serum
- Why it’s Vogue-approved: Topicals’ niacinamide serum takes the form of a lightweight, soothing cream – whipped with shea butter, it’s a delight to apply to damaged skin. Exactly the kind of salve you want handy on holiday, the mess-free tube is host to several hero pigment inhibitors that prevent and reverse signs of sun damage. “This is the serum that set me straight on niacinamide’s prowess: it melts into the skin and improves oiliness almost instantly,” explains beauty writer Tracy Achonwa. “Not only that, but my skin has been pretty much poreless since I tried it, which is a welcome change on my textured, pimple-prone skin. Of course, the roster of other ingredients plays a role in its effectiveness for hyperpigmentation. It has nearly every tyrosinase inhibitor there is and really does do what its name suggests, while keeping skin feeling comfortable and non-sensitised with soothing allantoin and centella asiatica.”
- Niacinamide strength: 3-4 per cent
- Key ingredients: azelaic acid, tranexamic acid, kojic acid, alpha arbutin, centella asiatica
The Perfect Peel Hyaluronic & Peptide Serum
- Why it’s Vogue-approved: Packed with peptides, humectants and tyrosinase inhibitors, including alpha arbutin and kojic acid, this serum targets dark spots and prevents the irritation that causes post-inflammatory hyperpigmentation in the first place. Non-sticky and fast absorbing, it’s Vogue contributor Tracy Achonwa’s current favourite: “Not only does this serum do a great job of clearing up acne marks and making skin glassy and smooth, but crucially, it’s non-comedogenic and doesn’t trigger new breakouts. Those who have struggled with their skin will know that alone makes it a godsend, but if you’re not convinced, look to its runny, non-pilling formula for further proof. Layering well under SPF and make-up, it’s a sound investment in your skincare routine for brighter, smoother skin.”
- Key ingredients: hyaluronic acid, antioxidants, and peptides
Neoretin
Discrom Lightening Peel Facial Pads
- Why we love it: Efficient enough to require use just once a week, these facial pads are a favourite of contributing writer Tracy Achonwa. “You get six pads in a pack, but that is plenty considering how powerfully these work. I used one a week for just over a month and was pleasantly surprised to find my skin felt softer and my dark marks had faded significantly,” she says. “The genius of this formula is that it uses glycolic acid to penetrate skin deeply, improving the absorption of bonus skin brighteners like kojic acid that stop excess melanin in its tracks.’’ Saturated in a combination of actives, it’s ideal for those who have already built up a good tolerance of glycolic acid and want a brightening boost.
- Key ingredients: Glycolic acid, kojic acid, niacinamide, vitamin A
- Size: 6 pads
How long will it take to see results from kojic acid?
According to dermatologist Dr Christine Hall, “Consistent use over a period of approximately 12 weeks is typically required before significant improvements are observed.”
What concentration of kojic acid is safe and effective?
Look out for low concentrations of 1 to 2 per cent, says the expert. “Most formulations contain around 1 per cent kojic acid, which is considered both safe and effective. Some products may go up to 2 per cent, but higher concentrations than this are not generally recommended due to an increased risk of irritation.”
What are the side effects of kojic acid?
While considered generally safe, Dr Hall highlights potential side effects like “redness, itching, flaking, and, in some cases, contact dermatitis – particularly in sensitive individuals.” Suncream is always to be used after application, as “Kojic acid may also increase photosensitivity”. She recommends a broad-spectrum SPF 50.
Should I use kojic acid as a serum, cream, or cleanser?
“Leave-on formulations are preferable,” says Dr Hall. “Kojic acid isn’t absorbed particularly well, so it is even more important that there is sufficient contact time with the skin to be effective. Serums and creams are therefore more efficacious than cleansers, which are rinsed off too quickly to deliver meaningful results.”
How often should I apply kojic acid and when?
According to the derm, “Kojic acid is best applied once daily in the evening. It should be introduced gradually, starting one to two times per week and increasing frequency as tolerated. Application should follow cleansing, and then depending on the formulation – serums should go after cleansing or moisturiser after the serum. Given its photosensitising effects and its role in treating pigmentation, consistent daily use of SPF is essential.”
Can I combine it with actives like retinol, vitamin C, or salicylic acid? What is best layered with it?
“Kojic acid can be effectively combined with other actives, but careful scheduling is important to avoid irritation from over-layering,” she notes. “While ingredients such as glycolic acid, tranexamic acid, vitamin C, salicylic acid, and retinoids all have complementary roles, they are often best used at alternate times (for example, vitamin C in the morning and retinoids on separate evenings) to protect the skin barrier.”
As for what can be used in tandem with kojic acid, Dr Hall highlights niacinamide. The versatile ingredient is “exceptionally gentle, making it suitable even for more sensitive skin types, and rather than increasing irritation risk, it actively supports and strengthens the skin barrier. In addition, niacinamide contributes to improvements in overall skin tone, texture, and brightness, enhancing the pigment-correcting effects of kojic acid without compounding sensitivity. For this reason, it is often the most practical and well-tolerated partner in a routine centred around kojic acid.”
Meet the expert
Dr Christine Hall is a dermatologist and Korean skincare expert