Skin pH and Why Your Cleanser Matters More Than You Think

July 1, 2026

Skin pH sounds like a technicality, but it has real implications for comfort and barrier health. Here is the science in plain terms.

What the research found

A study in the International Journal of Cosmetic Science measured skin surface pH and found that the natural pH is on average below 5, which is more acidic than often assumed, and that this acidity is beneficial for the skin's resident microbes and barrier function (Lambers et al., 2006, PMID 18489300). This slightly acidic surface is sometimes called the acid mantle.

Why cleanser choice matters

Traditional bar soaps tend to be quite alkaline, which can push skin pH up and leave it feeling tight. Gentler, lower pH cleansers are designed to clean without disrupting that acidic surface as much.

What to look for

A cleanser that leaves skin comfortable, not tight or squeaky.
Gentle, non-stripping formulas, especially for dry or sensitive skin.
Consistency, since how you cleanse daily matters more than any single product.

At Verdo we stock the Medik8 Gentle Cleanse, a mild everyday cleanser, and the Medik8 Calmwise Soothing Cleanser for reactive skin.

Disclaimer: This article is for general information only and is not medical advice. The studies cited are from peer-reviewed journals and are provided for educational context. Individual results vary. Speak with a qualified healthcare professional or dermatologist before changing your routine. Verdo Cosmetics makes no therapeutic claims about the products or services mentioned.

Frequently asked questions

What is the natural pH of skin?

A study measuring skin surface pH found the natural pH is on average below 5, more acidic than often assumed, and that this acidity benefits the skin's resident microbes and barrier (Lambers et al., 2006). This is sometimes called the acid mantle.

Does cleanser pH matter?

Yes. Traditional bar soaps are often quite alkaline and can push skin pH up, leaving it tight. Gentler, lower pH cleansers clean without disrupting the acidic surface as much.

How do I know if my cleanser is too harsh?

If skin feels tight, squeaky or uncomfortable after washing, the cleanser may be too stripping. A good cleanser leaves skin clean but comfortable.

Is a gentle cleanser enough to clean skin?

For most people, yes. A well-formulated gentle cleanser removes dirt, oil and sunscreen without stripping the skin, and consistency matters more than harshness.

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