WHAT IS THE PH VALUE?
The pH value describes the acid-base ratio of a solution and indicates how acidic or alkaline it is. It is measured on a scale from 0 to 14, where 7 is neutral, values below 7 are considered acidic and values above 7 are considered basic or alkaline. The skin usually has an acidic pH value between 4.1 and 5.8 - this is the so-called physiological pH value of the skin. A stable, acidic pH value promotes the activity of important enzymes in the skin that are responsible for renewing skin cells and maintaining the skin barrier. It also supports the function of the hydrolipid mantle, also known as the acid mantle. The hydrolipid mantle consists of a mixture of sebum, sweat and dead skin cells and protects the skin from environmental influences, bacteria and dehydration.
THE IMPORTANCE OF PH FOR THE SKIN MICROBIOME
The pH value of the skin is essential for the function of the acid mantle, which not only protects the skin barrier but also regulates the microbiome. An acidic pH value (4.0 to 5.8) supports the growth of beneficial bacteria such as Staphylococcus epidermidis and Cutibacterium acnes, which contribute to the production of antimicrobial peptides. These keep harmful microorganisms at bay and prevent infections. If the pH value rises above 7, the balance is disturbed and pathogenic bacteria such as Staphylococcus aureus can grow more easily. A stable, acidic pH value promotes skin renewal, strengthens the barrier function, and protects against inflammation and infections.
THE ROLE OF PH IN SKIN HEALTH
The acid mantle is more than just a barrier. It is a sophisticated buffer system in the uppermost layer of the skin that promotes the structural stability of the skin, regulates the microbiome, and counteracts inflammation by maintaining an acidic environment. A stable, acidic pH is crucial for maintaining the integrity of the skin barrier. Fluctuations in pH can not only impair the skin's barrier function, but also exacerbate dermatological conditions.
THE PH OF THE SKIN IN DIFFERENT AREAS OF THE BODY
Did you know that the pH value of the skin can vary depending on the area of the body? The pH value on the face is often lower than on the arms or feet, as the face is more exposed to environmental influences such as UV radiation or dirt particles and the skin here is more sensitive. The pH value of the skin on the body can be influenced by various factors, such as clothing, sweat, or care products.
CHANGES IN PH VALUE WITH AGE
With age, not only does the condition of the skin change, but so does its pH value. Studies show that the pH value of the skin tends to increase over time and often has a higher, i.e. less acidic, pH value in old age. This is because the skin becomes drier with age and produces less sebum, which can lead to a disturbed hydrolipid mantle. An increased pH value can weaken the skin barrier, leading to dryness, irritation, and an increased risk of skin diseases. The use of pH-neutral products and moisturizing care products is therefore particularly recommended in old age to support the skin's natural acid protection.
CLEANSING AND ITS EFFECT ON THE SKIN'S pH VALUE
Mild cleansing is particularly recommended to preserve the skin's natural pH value. Simply coming into contact with water can impair the skin's acid mantle, as tap water is usually slightly alkaline. In addition, aggressive surfactants or alkaline cleansing products can disrupt the skin's pH value and make it more susceptible to irritation. The Ten out of Ten Gentle Gel Cleanser from DR EMI ARPA SKIN, with a skin-neutral pH value of around 4.9, offers gentle cleansing that supports skin health and preserves the natural balance of the acid mantle and thus the skin barrier.
