On the other hand, certain ingredients can trigger irritation and should be avoided if you're using kojic acid in your skincare routine. Harsh acids, like alpha-hydroxy acids (AHAs), are a prime example, as well as certain retinoids.
High Concentrations of AHAs/BHAs: The Acid Overload
Now, let's talk about AHAs (Alpha Hydroxy Acids) and BHAs (Beta Hydroxy Acids). They're fantastic for exfoliation and clearing up your skin, but here's the kicker: when you mix them with kojic acid in high concentrations, it's like a bad acid trip… literally.
Chemical reactions
Deprotonation of the ring-OH group converts kojic acid to kojate. Kojate chelates to iron(III), forming a red complex Fe(HOCH 2C 5OH 2O 2) 3. This kind of reaction may be the basis of the biological function of kojic acid, that is, to solubilize ferric iron.
Other active ingredients: While kojic acid works well on its own, its effects are even better when paired with other brightening agents, such as niacinamide and azelaic acid. Product type: Kojic acid needs time to absorb into skin in order to work, so it should be in a product you leave on versus one you rinse off.
Because it is a whitening soap, your skin will become dry so you'll have to apply a moisturizer or lotion. Kojic acid also increases sun sensitivity thus if you don't wear sunscreen or sunblock before going out, even staying indoors next to windows, can cause your skin to darken.
Niacinamide. This superhero skincare ingredient beautifully complements kojic acid's brightening properties. It also protects the skin against environmental damage, soothes irritation, boosts collagen production, and regulates oil production so you can cover all of your skincare bases!
La Roche-Posay Glycolic B5 Serum with Kojic Acid
Not only does it boast the most Amazon reviews, but this kojic acid skincare product relies on some impressive ingredients to give you cover-shot-worthy skin minus Photoshop.
If you have dry or damaged skin it might be more susceptible to the potential darkening effects of kojic acid. Ensuring your skin is healthy and well-nourished is key to making kojic acid work in your favor. A balanced diet, ample hydration, and a good sleep cycle can all contribute to healthier skin.
One compatible ingredient that can be used with Kojic acid is Vitamin C. When combined, this blend of these active ingredients can boost the skin's brightening and antioxidant effects. Vitamin C helps to further inhibit melanin production and promote collagen.
Kojic Acid can make your skin more sensitive to the harmful effects of sunlight. Hence it is advised to use sunscreen and wear protective clothing while using Kojic Acid. It is recommended to avoid tanning booths and sunlamps.
Moisturize: Follow up with a nourishing moisturizer to seal in the benefits of kojic acid and keep your skin hydrated. Sunscreen (AM only): Since kojic acid can increase sun sensitivity, always finish with a broad-spectrum sunscreen during the day.
The Benefits of Combining Kojic Acid and Hyaluronic Acid
Addressing Multiple Skin Concerns: The combination of Kojic Acid and Hyaluronic Acid allows you to tackle a wide range of skin concerns, including uneven skin tone, dullness, fine lines, and dehydration, all in one comprehensive skincare routine.
Genistein, daidzein, kojic acid, alpha-arbutin and arbutin-containing products cannot be placed on the EU market as of Feb. 1, 2025; products containing it cannot be made available to the EU market as of Nov. 1, 2025.
Generally, it's recommended you don't mix retinol and salicylic acid in your skincare routine due to the risk of redness or potentially irritating side effects [3].
Skin irritation: Kojic acid can dry and irritate some people's skin, especially if you already have sensitive skin. Allergies: Some people experience allergic reactions to kojic acid, resulting in an itchy and dry skin rash called contact dermatitis.
Kojic Acid further enhances the brightening effect by inhibiting melanin production, while Niacinamide helps to improve skin texture and reduce the appearance of pores.
Glycolic Acid
It is an alpha-hydroxy acid (AHA) derived from sugarcane. In low concentrations, glycolic acid produces desquamation of pigmented skin cells. About 30 to 70 per cent of glycolic acid can enhance the penetration of other skin lighteners such as HQ.
If you have sensitive or easily irritated skin, Kojic acid may be preferable because it is gentler and less prone to cause irritation. Retinol, on the other hand, may be better suited to people with more robust skin because it might induce early irritation and peeling.
Salicylic acid
It is an exfoliating agent that removes dark spots and acne-causing bacteria along with dead skin cells that can lead to pigmentation.
Kojic acid is generally suitable for all skin types. However, if it is combined with other exfoliating acids like glycolic acid, it is recommended not to use it every night to avoid over-exfoliating the skin. Kojic acid can cause irritation or contact dermatitis if the concentration is too high.
How is alpha arbutin better than kojic acid? It is gentle on the skin: Unlike kojic acid, which can cause stinging, irritation, or redness, alpha arbutin is much milder, making it suitable for all skin types.