Does Mandelic Acid Affect the Efficacy of Whitening Products?

What are the interactions between mandelic acid and whitening products?

I recently bought an 18% mandelic acid at Watsons and have been using a whitening toner as well.
I apply the toner first and then the acid, but I've heard that mandelic acid can render whitening products ineffective.
Is this true? Some say that only high-concentration mandelic acid used in medical aesthetics can cause whitening products to be ineffective.
I have oily skin, and the mandelic acid product suggests using it 2 to 3 times a week, but I don't experience any discomfort or peeling even when I use it daily, and I maintain good hydration.
Should I continue using it daily, or stick to the recommended 2 to 3 times a week? I would appreciate your guidance, doctor!

Niming, 10~19 year old female. Ask Date: 2021/06/26

Dr. Wu Yuxin reply Dermatology

Mandelic acid does not render whitening products ineffective, but it is recommended to use it once a week.

Reply Date: 2021/06/26

More Info

Mandelic acid, a type of alpha hydroxy acid (AHA), is derived from almonds and is known for its gentle exfoliating properties. It is often used in skincare for its ability to improve skin texture, reduce the appearance of fine lines, and promote an even skin tone. When it comes to its interaction with whitening products, there is a common concern among users regarding whether mandelic acid can diminish the efficacy of these products.

To address your question, mandelic acid does not inherently negate the effects of whitening products. In fact, it can complement them by enhancing the absorption of active ingredients in the whitening formulations. The exfoliating action of mandelic acid helps to remove dead skin cells, which can allow for better penetration of other products applied afterward, including those aimed at brightening the skin. However, it is essential to consider the concentration and frequency of use.

You mentioned using an 18% concentration of mandelic acid and applying it daily without experiencing adverse effects. While some individuals with oily skin may tolerate daily use, it is generally recommended to follow the instructions provided by the product or your dermatologist. For most people, using mandelic acid 2-3 times a week is sufficient to achieve desired results without over-exfoliating the skin. Overuse can lead to irritation, redness, or increased sensitivity, which might counteract the benefits of both the mandelic acid and the whitening products.

Regarding the concern that high concentrations of mandelic acid might render whitening products ineffective, this is not universally true. The effectiveness of whitening agents can depend on various factors, including the specific ingredients used, the formulation of the products, and individual skin types. High concentrations of mandelic acid may cause irritation in some individuals, which could lead to a compromised skin barrier. A compromised barrier can affect how well other products work, including those intended for skin whitening.

If you are using a whitening toner followed by mandelic acid, it is advisable to apply the toner first, allowing it to absorb before applying the mandelic acid. This layering technique can help maintain the efficacy of both products. However, if you notice any irritation or adverse reactions, it would be wise to adjust the frequency of application or consult with a dermatologist.

In summary, mandelic acid does not inherently reduce the effectiveness of whitening products. Instead, it can enhance their efficacy by promoting better absorption. However, moderation is key, and it is essential to listen to your skin's needs. If you are unsure about the best routine for your skin type, especially considering your oily skin, consulting with a dermatologist can provide personalized recommendations tailored to your specific concerns and goals.

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