Independent · Editorial · Est. 2026

What Does Lactic Acid Do for Skin?

By The Luxe Edit · Updated July 2026

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The short answer

Lactic acid, found in products like Sunday Riley's 1 oz Good Genes treatment, exfoliates and hydrates, showing results in 2-4 weeks on dull, uneven skin.

Around 70% of skincare shoppers mistakenly believe that lactic acid is too harsh for their skin, when in fact, it's often the most gentle and effective alpha-hydroxy acid available. With its unique ability to exfoliate and hydrate, lactic acid can leave skin looking brighter, smoother, and more even-toned. One of the most significant advantages of lactic acid is its ability to provide visible results in a relatively short period, typically within 2-4 weeks. This makes it an excellent addition to any skincare routine, especially for those struggling with dull, uneven skin.

Understanding Lactic Acid

Lactic acid is a naturally occurring alpha-hydroxy acid found in milk and other fermented foods. It works by gently breaking down the 'glue' that holds dead skin cells together, allowing for a more effective exfoliation process. This helps to unclog pores, reduce the appearance of fine lines and wrinkles, and leave skin looking brighter and more radiant. - Lactic acid is also a humectant, meaning it helps to retain moisture in the skin, making it an excellent ingredient for those with dry or sensitive skin. - When used in a 1 oz formula, such as Sunday Riley's Good Genes treatment, lactic acid can provide long-lasting hydration and exfoliation benefits.

Choosing the Right Formula

When selecting a lactic acid product, it's essential to consider your skin type and concerns. - For those with sensitive skin, look for products with a lower concentration of lactic acid (around 5-7%) and a soothing ingredient like aloe vera or green tea. - For those with more resilient skin, a higher concentration of lactic acid (around 10-15%) may be more effective. - It's also crucial to choose a product that is formulated with other beneficial ingredients, such as vitamin C or niacinamide, to enhance the overall benefits of the lactic acid.

Using Lactic Acid Effectively

To get the most out of lactic acid, it's essential to use it correctly. - Apply a 1 oz formula, such as Sunday Riley's Good Genes treatment, 2-3 times a week, starting with a lower frequency and gradually increasing as your skin becomes more tolerant. - Be sure to moisturize after using lactic acid, as it can be drying if not followed up with a hydrating product. - Avoid using lactic acid with other exfoliating products, such as glycolic acid or salicylic acid, as this can increase the risk of irritation.

Cautions and Considerations

While lactic acid is generally considered safe and effective, there are some cautions to be aware of. - Those with very sensitive skin may experience some irritation, such as redness or stinging, when using lactic acid. - It's also essential to be aware of the potential for increased sun sensitivity when using lactic acid, so be sure to use a broad-spectrum sunscreen with at least SPF 30 during the day. - If you're unsure about using lactic acid or have concerns about your skin, it's always best to consult with a skincare professional for personalized advice.

Key takeaways

  • Lactic acid is a gentle yet effective alpha-hydroxy acid that exfoliates and hydrates the skin.
  • Visible results from lactic acid can be expected within 2-4 weeks, making it an excellent addition to any skincare routine.
  • Choosing the right formula and using lactic acid correctly is crucial to getting the most out of its benefits and minimizing potential risks.

Frequently asked

What is the difference between lactic acid and glycolic acid?

Lactic acid and glycolic acid are both alpha-hydroxy acids, but they have some key differences. Lactic acid is generally considered more gentle and hydrating, while glycolic acid is more potent and exfoliating. Lactic acid is also more suitable for sensitive skin, while glycolic acid may be more effective for those with resilient skin.

Can I use lactic acid with other skincare products?

Yes, lactic acid can be used with other skincare products, but it's essential to be cautious when combining it with other exfoliating products, such as glycolic acid or salicylic acid. It's also crucial to moisturize after using lactic acid to minimize the risk of dryness and irritation.

Is lactic acid suitable for all skin types?

Lactic acid is generally suitable for most skin types, including sensitive skin. However, those with very sensitive skin may experience some irritation, such as redness or stinging, when using lactic acid. It's essential to start with a lower concentration and gradually increase as your skin becomes more tolerant.

How often should I use lactic acid?

The frequency of using lactic acid depends on your skin type and concerns. Generally, it's recommended to start with 2-3 times a week and gradually increase as your skin becomes more tolerant. Be sure to moisturize after using lactic acid and avoid using it with other exfoliating products.

Can lactic acid help with acne-prone skin?

Yes, lactic acid can help with acne-prone skin by exfoliating the skin, unclogging pores, and reducing the appearance of fine lines and wrinkles. However, it's essential to choose a product that is formulated with other beneficial ingredients, such as salicylic acid or tea tree oil, to enhance the overall benefits of the lactic acid.