The pH level is a measure that reflects the acid–alkaline balance of a product. The pH value of any skincare product we apply has a direct impact not only on the health of our skin, but also on how it feels immediately after use.

Human skin has a natural protective barrier known as the acid mantle. Its pH typically ranges between 4.5 and 5.5. This slightly acidic environment is essential for the optimal functioning of the skin’s microbiome, which protects against pathogens, irritation, and dehydration.

Numerous scientific studies — including one published in the International Journal of Cosmetic Science (2006) — confirm that skincare products formulated with a pH close to that of healthy skin help maintain the skin barrier and reduce the risk of increased sensitivity.

But what happens when we use products with pH levels outside this range?

Products with a high (alkaline) pH — 7 and above — can disrupt the lipid barrier of the skin. This may lead to dryness, irritation, and inflammation. Research conducted by the American Academy of Dermatology found that washing with products with a pH above 7 for just two weeks caused significant irritation in patients with sensitive skin.

Products with a low (acidic) pH — below 4 also require caution. They can increase photosensitivity, redness, flaking, and a burning sensation, particularly when they contain active acids such as AHAs or BHAs. These formulations should be used in limited courses and under the supervision of a skincare professional — especially for individuals with sensitive skin.

Precise pH formulation is one of the hallmarks of high-quality skincare. This is particularly crucial for products such as:
● cleansing creams and foams
● toners
● day and night creams

When choosing your at-home skincare routine, opt for products with a pH that matches the natural parameters of the skin. This will help minimize discomfort and maximize the effectiveness of your regimen.

Selecting products with the right pH level is not just an investment in beauty — it’s an investment in the health of your skin.

Take it seriously, and your skin will thank you.