Skin pH
Skin pH — a measure of how acidic or alkaline the skin's surface is, typically sitting on the slightly acidic side of the scale in healthy skin. Maintaining this acidity supports barrier enzymes, the microbiome, and overall skin resilience.
Key points
- Healthy skin surface pH is generally slightly acidic, often cited in the range of about 4.7 to 5.5.
- A slightly acidic pH supports enzymes involved in barrier repair and lipid processing.
- Alkaline cleansers can raise skin pH temporarily, potentially stressing the barrier and microbiome.
- Skin usually restores its natural pH after mild disruption, though repeated stress can slow recovery.
- Skin pH can vary by body site, age, and environmental conditions.
Frequently asked
Why does skin pH matter in skincare?
Because a slightly acidic pH supports the skin barrier and microbiome, many formulators design cleansers and products to stay close to the skin's natural pH.
Do all skincare products need to be pH-balanced?
Not all; some actives like certain exfoliating acids work at lower pH by design, but leave-on products are often formulated to be compatible with skin's natural acidity.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
