What is skin acid?

Skin acid refers to the acidic nature of the skin surface, which is covered with a thin, protective layer known as the acid mantle. The pH level of the skin is normally maintained between 4.5 and 5.5, making it slightly acidic. This acidic environment plays an important role in several aspects of skin health:

Barrier function: The acidic pH helps to maintain the integrity of the skin barrier. It creates an unfavorable environment for the growth of harmful bacteria, fungi, and viruses, reducing the risk of infection. The acid mantle also helps retain moisture and prevents excessive water loss, contributing to skin hydration.

Microbiome balance: The skin microbiome is a diverse community of microorganisms that reside on the skin surface. An acidic pH helps regulate the balance of these microorganisms, promoting the growth of beneficial bacteria while inhibiting the overgrowth of potentially harmful ones. This balance is essential for maintaining skin health and preventing skin conditions such as acne, eczema, and fungal infections.

Inflammation: The acidic pH of the skin has anti-inflammatory properties. It helps to neutralize harmful substances, reduce inflammation, and promote skin repair. This is especially important in conditions like psoriasis and atopic dermatitis, where inflammation plays a key role.

Photoprotection: The acid mantle is believed to provide some degree of protection against the damaging effects of ultraviolet (UV) radiation. The acidic environment can help to scavenge free radicals generated by UV exposure, reducing the risk of skin damage and photoaging.

Healing and repair: The acidic pH supports the skin's natural healing processes. It facilitates the migration of skin cells during wound healing, promotes collagen synthesis, and enhances tissue regeneration.

It's worth noting that disrupting the skin's natural acidity, either through excessive use of harsh cleansers or skin care products with an unsuitable pH, can compromise the skin barrier and contribute to skin problems. Preserving the skin's acidic pH is essential for maintaining skin health and preventing various skin conditions.