Why Traditional Soap Gets a Bad Rap: A Dermatologist Explains

Why does traditional soap have such a bad rap? I'm Dr. Heather, MD, board-certified dermatologist, here with the answer! Soap has been used for centuries to cleanse our skin, but it can be quite drying. Let's explore why.

Key Takeaways

  • Saponification: Traditional soap is made through saponification, a process that results in a high pH (alkaline) product.

  • Acid Mantle: Our skin's natural pH is slightly acidic, creating a protective barrier called the acid mantle.

  • Disruption and Irritation: Soap's high pH can disrupt the acid mantle, leading to dryness and irritation.

  • Choose Wisely: Opt for cleansers with a pH closer to the skin's natural pH (between 4 and 6) to avoid irritation.

The Chemistry of Soap

Soap was originally made by mixing fats or oils with an alkali, which is usually lye. This process, called saponification, results in a soap with a pH between 9 and 12.

However, the pH of our skin is naturally quite different. Our skin has a slightly acidic pH, typically between 4 and 6. This acidity creates a protective barrier called the acid mantle.

The Acid Mantle

The acid mantle plays a crucial role in maintaining healthy skin. It helps to:

  • Protect against harmful bacteria and other microorganisms.

  • Maintain skin hydration.

  • Regulate skin cell turnover.

Soap's Impact on Skin

When soap with a high alkaline pH comes into contact with our skin's acid mantle, it can disrupt this delicate balance. This disruption can lead to:

  • Dryness

  • Irritation

  • Increased sensitivity

  • Impaired barrier function

Choosing the Right Cleanser

When choosing a cleanser, especially if you have sensitive skin, it's important to look for one that has a pH closer to your skin's natural pH. This helps to protect the acid mantle and prevent irritation.

Many modern cleansers are formulated to be pH-balanced, meaning they have a pH that is closer to the skin's natural pH. These cleansers are often labeled as "pH-balanced," "gentle," or "for sensitive skin."

Conclusion

Although traditional soaps have a long and interesting history, it's important to understand their potential impact on our skin. By choosing cleansers that respect our skin's natural pH, we can maintain a healthy acid mantle and avoid dryness and irritation.

If you love learning about skincare, check out my Ultimate Skincare Guide!

Mary Rose Agojo