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.
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.
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.
Kojic acid helps to reduce the appearance of dark spots and promote a more even skin tone by slowing down melanin production. To increase its effectiveness, kojic acid is frequently combined with other skin lightening agents such as hydroquinone, vitamin C, and niacinamide.
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's properties allow it to be a bleaching agent when used in creams, gels, and other cosmetics. Kojic acid is similar to a chemical called hydroquinone. They are both effective treatments for hyperpigmentation.
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.
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.
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.
Kojic Acid further enhances the brightening effect by inhibiting melanin production, while Niacinamide helps to improve skin texture and reduce the appearance of pores.
DON'T MIX: AHA/BHA and niacinamide
Niacinamide is used to treat hyperpigmentation and reduce fine lines and wrinkles, while alpha hydroxy acids (AHAs) and beta hydroxy acids (BHAs) are chemical exfoliants. To understand why niacinamide shouldn't be mixed with AHAs and BHAs, you need to consider pH.
SAFETY: Kojic acid is safe for topical use in concentrations of up to 1% in skin care products. Do not use longer than 3 months at a time. GHS TIP: Although some people may see results after a few weeks, on average it will take 1-2 months of consistent topical use of kojic acid before you begin to see improvements.
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.
What triggers hyperpigmentation? Triggers include sun exposure, hormonal changes, and trauma to the skin, for example, due to acne or an injury. Picking at scabs and spots may make it worse. Some face creams can irritate the skin, leading to further hyperpigmentation.
Can kojic acid make you darker? No, kojic acid does not darken your skin. In fact, it has skin lightening effects. The best kojic acid cream for hyperpigmentation is available widely in the market that diminishes dark spots and brightens up your face and body.
Don't use the kojic acid soap on cut, cracked, or lightened skin conditions. If you have irritated, cut, bruised, cracked, or lightened scars or skin that suffers from loss of pigment such as in vitiligo, then you should avoid using kojic acid.
Kojic acid: Kojic acid is a natural skin lightening agent that can help to remove the tanned layer from the skin. It works by inhibiting the production of melanin, which helps to lighten the skin. Kojic acid is available in various forms, such as creams and serums, and can be used under the guidance of a dermatologist.
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.
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.
Opt for Niacinamide when:
Ø You want to address multiple skin issues: Besides treating hyperpigmentation, kojic acid not only keeps the skin hydrated but also reduces the size of pores, thereby promoting healthy skin.