What is skin pH and why does it matter when choosing a soap?
pH is a measure that indicates whether a substance is acidic, neutral, or alkaline. The scale ranges from 0 to 14: 7 is considered neutral, values below are acidic, and values above are alkaline.
On the surface of healthy skin, the pH is usually slightly acidic and can vary depending on the area of the body, age, and other factors. Therefore, rather than looking for an identical figure for everyone, it is better to understand how the skin and cleansing products interact.
What is the normal pH of the skin?
The skin's surface usually has a pH of approximately between 4 and 6, although there are individual variations and differences depending on the area. This acidity is part of the so-called acid mantle and plays a role in the function of the skin barrier.
pH is not the only factor that determines whether a product is gentle: surfactants, the formulation, the frequency of washing, water temperature, and contact time with the skin also play a role.
What happens when we use an alkaline soap?
Traditional soaps made through saponification are usually alkaline. Alkaline cleansers can temporarily raise the surface pH and, in some circumstances, contribute to dryness or irritation, especially when used frequently or on sensitive skin.
This does not mean that every alkaline soap will cause a problem or that pH is the only criterion for choosing a cleanser. Tolerance depends on the individual and the complete formulation.
Does neutral pH mean the same thing as skin-friendly pH?
Not exactly. A pH of 7 is neutral, while the surface of the skin is usually slightly acidic. For this reason, when talking about "skin-friendly" products, it may be more useful to check the specific pH of the product and assess the formulation as a whole.
Some mild synthetic cleansers, known as syndets, can be formulated with a pH close to that of the skin and tend to cause less disruption to the skin's pH than alkaline soaps.
What pH should a soap or shower gel have?
There is no single figure that works for every person and situation. In general, for sensitive skin, it may be reasonable to look for mild cleansers, avoid unnecessarily irritating formulas, and consider products with a pH close to that of the skin.
If you have a diagnosed dermatological condition, follow your dermatologist's recommendations, as the most appropriate product depends on the specific situation.
pH, sensitive skin, and daily cleansing
A simple routine can help reduce irritation:
- Use lukewarm water instead of very hot water.
- Avoid rubbing the skin too hard.
- Choose mild cleansers and rinse them well.
- Do not prolong the product's contact with the skin unnecessarily.
- If you notice persistent dryness or irritation, check the product and consult a healthcare professional.
The choice of cleanser should consider both pH and ingredients, as well as individual tolerance.
What about natural soaps?
“Natural” does not automatically mean “neutral pH” or “suitable for all skin types.” A soap made through saponification can be alkaline even if its ingredients are of natural origin.
Therefore, if you are comparing products, check their composition, intended use, and the information provided by the manufacturer about the pH. In the case of a cosmetic product, it is also important to follow its instructions for use.
The pH of Home Healthy Home soaps
At Home Healthy Home, we are committed to careful formulas and clear information about our products. You can consult our personal care collection and review the specific characteristics of each soap before choosing.
If you want to know more about how oil is transformed into soap, you can also read our article on cold saponification.
Frequently asked questions about skin pH
What is the skin's pH?
The skin's surface usually has a slightly acidic pH, approximately between 4 and 6, although it can vary depending on the area and the person.
Is pH 7 the skin's pH?
No. pH 7 is neutral. The skin's surface is usually slightly acidic.
Do traditional soaps have a neutral pH?
Usually, no. True soaps obtained by saponification are generally alkaline.
Is a soap with an alkaline pH necessarily bad?
Not necessarily. Tolerance depends on the formulation, the frequency of use, and the characteristics of each individual's skin. However, alkaline cleansers can temporarily alter the surface pH and promote dryness or irritation in certain circumstances.
What is best for sensitive skin?
It is advisable to prioritize mild cleansing and assess the complete formulation, including the pH. If there is a diagnosed skin disease or persistent irritation, it is recommended to follow a dermatologist's instructions.
In summary
The skin's surface is slightly acidic and pH is one of the factors that influence how a cleanser interacts with it. Rather than looking for a "perfect" product, it is better to value pH, ingredients, mildness, frequency of use, and individual tolerance.
