frequently asked questions

what is kojic acid?

  • What is kojic acid?

Kojic acid is a common byproduct of fermentation of rice and soy by certain fungi and this process of fermentation is the breakdown of substances by microorganisms. Our Kojic acid is derived from Japanese Red Rice. 

  • Is kojic acid a steroid?

Kojic acid is not a steroid due to its chemical composition and function. A steroid is a biologically active compound that can be found in your body as well as produced synthetically. Steroids mainly function to either build tissue or help with inflammation. 

  • How does kojic acid lighten skin?

Melanin, which gives your skin pigment, is derived from tyrosine. Kojic acid works by blocking the activity of this non-essential amino acid, tyrosine, which decreases melanin production and helps lighten the skin. 

  • What is kojic acid made out of?

Just like lactic acid in skincare is a by-product of fermentation of milk or other sugar-rich foods, Kojic acid is a by-product of fermentation by specific fungi.


about our kojic acid.

  • How many times a day can I use this serum?

Due to the strength of our kojic acid serum it is highly recommended to only use this serum once or twice a day depending on tolerance.


  • How long should I leave this serum on?

For first time users, it is recommended that you start between 1-3 minutes to understand your skin tolerance. No more than 5-7 minutes is recommended during any one use. 

  • Do I have to wash this serum off or can I leave it on?

It is important that you wash off the serum after use. Never leave the serum on, especially overnight. Do not worry thinking that you are not getting the effects by washing it off. Although you are washing the serum off, the formulation was designed to penetrate the skin and be quickly absorbed during the time it is left of the skin.


  • Can I use this serum on other body parts?

Yes, using this serum on other body parts is completely ok. On the other hand, you should not use this serum on sensitive and intimate areas.

  • How to use Kojic Acid Serum?

Prior to using kojic acid it is important that your skin is properly moisturized as applying acids to dry skin will only irritate it. After cleansing and moisturizing the skin, apply the serum as stated on the directions. Follow with moisturizer.

Frequently Asked Questions, Girl Thinking


Frequently Asked Questions, Girl Thinking

kojic acid results.

  • Are kojic acid results permanent

Kojic acid works to help reduce the signs of pigmentation on the skin. Consistent use and a proper skincare routine to help protect the skin from UV damage will ensure long lasting results. Nothing in skincare is a quick one time fix, dedication and consistency is key! 

  • Can you use kojic aid long term?

There are no serious known side effects to using kojic acid for a long period of time. It is important to keep in mind that Kojic acid and Alpha Hydroxy Acids increase your skin’s sensitivity to the sun therefore it is important to use sunscreen when using these ingredients.


  • What happens if you stop using kojic acid?

Using kojic acid for a long period of time can make your skin get used to the ingredient. It is recommended to take breaks with kojic acid as this will allow your skin to reset and reap the benefits once used again.


  • How long does kojic acid take to lighten skin?

On average you will see a lighter skin tone when using kojic acid within 2 weeks of consistent use. Please note that everyone is different and some may experience faster or longer results.



kojic acid safety.

  • Why does kojic acid sting?

When you first begin to start using kojic acid on your skin, you will only feel a slight sting and tingling especially on sensitive skin due to its low molecular weight and ability to penetrate deep into the skin.

  • Is kojic acid good for oily skin?

Kojic acid is considered to be good for oily skin as it helps reduce excessive oil. Kojic acid also has anti-microbial properties to help reduce bacteria on the skin.


  • How much kojic acid is safe?

Kojic acid is a strong acid when in higher concentrations and not properly diluted or balanced with other ingredients. It is important to never try making your own kojic acid serum at home as this is unsafe and you can cause serious side effects. Our kojic acid is formulated in the right concentrations and is tested on all levels to ensure a safe serum.


  • Is kojic acid safe for sensitive skin?

As an alternative to hydroquinone, kojic acid is considered safe and gentle on sensitive skin. Please keep in mind, when applying the serum for the first time on sensitive skin to ensure it is properly moisturized.

  • Is kojic acid safe while breastfeeding?

Like vitamin C, kojic acid is safe to use while breastfeeding or pregnant. Make sure to avoid hydroquinone as it is unsafe while breastfeeding or pregnant.


  • Will kojic acid damage my skin?

Kojic acid is a safe acid that helps to reduce the appearance of pigmentation. It will not damage your skin if used properly as directed. 

Frequently Asked Questions, Girl Thinking


Frequently Asked Questions, Girl Thinking

kojic acid vs. the others.

  • Kojic acid and hydroquinine together?

Kojic acid is a much safer and gentler ingredient than Hydroquinone. Although hydroquinone is known to help lighten the skin it is not recommended for sensitive skin while kojic acid is.


  • Kojic acid and tretinoin together

Tretinoin is a topical medication used to treat hyperpigmentation and sometimes acne. It is not recommended to be used with Kojic acid as it can increase your skin’s sensitivity and possibly lead to irritation.


  • Kojic acid Serum or Cream?

When choosing between a kojic acid serum or cream it is recommended to use a serum. Popular kojic acid creams use additional ingredients for preservation, consistency, fragrance, and even color. 

  • Kojic acid Soap or Serum?

When choosing between kojic acid soap or serum it is recommended to use a serum. Popular kojic acid soaps contain oils, fragrance, colors, and artificial ingredients. They are also known to burn and irritate the skin. 

  • Kojic Acid Serum or Kojic Acid Powder?

When choosing between a kojic acid serum or powder it is highly recommended to use a serum.

Popular kojic acid powder products force you to create your own cream or serum by mixing different ingredients. Powdered Kojic Acid products usually lead to more discoloration and produce unsafe results.


  • Kojic acid and glycolic acid together?

Kojic acid and glycolic acid together make a great combination when it comes to fighting discoloration on the skin. Kojic acid helps block melanin production while glycolic acid gently exfoliates the skin to further help reduce pigmentation. 

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