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Everything you need to know about hair pH

Many women still have doubts about what exactly hair pH means and what this changes when choosing products to use on their locks. The pH, which stands for hydrogenic potential, determines the acidity or alkalinity of a liquid substance.

As the layer that surrounds the hair, skin and nails have a slightly acidic pH, the products used on them should be neutral, slightly acidic or have the same pH. The difference between the pH of the hair and the products used in it have a direct influence on the health of the hair.

The pH variation is as follows: less than 7 indicates that the substance is acidic, with pH equal to 7 it is neutral and with pH above 7 it is basic or alkaline. The chemicals used to transform the hair, for example, have an alkaline pH, so that the scales open and allow the transformation.

However, too high a pH damages the hair, leaving the strands rough and dry. The ideal for hair treated with chemicals is the lowest pH, that is, acidic products to close the hair cuticles.

As for shampoo, it is best to use products with a pH around 5, which is closest to the pH of the scalp. Conditioners and hydration masks should have a pH around 4. The pH of conditioners should always be lower than that of shampoo to close the hair scales well.

To avoid problems, try to always use the same line of products, so you don’t run the risk of using a higher pH shampoo and a conditioner that doesn’t have a low pH to make up the difference. In addition, you can also resort to products that normalize the pH of the hair, the so-called pH stabilizers that can be found in any beauty supply store.

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