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Perhaps the most important thing you can do to improve the health of your hair is to keep the pH factor of your hair in an acid balance. Since this is so important, let’s take a closer look at what this means.

pH measurements are important in a wide-range of sciences including trichology, which deals with the scientific study of the health of hair and scalp. pH stands for “power of hydrogen” and is a measure of the activity of the hydrogen ion. By international agreement, pH is measured on a logarithmic scale that ranges from 0 to 14. A solution that is less than 7 on the pH scale is said to be acidic, and a solution greater than 7 is said to be basic or alkaline. It might seem strange to hear that your hair, skin, and nails should be acidic, but your body protects itself naturally by staying in a slightly acid state of 4.5 to 5.5. Therefore, anything you put on your skin, hair, or nails should also be acid balanced close to these numbers. For example, a good shampoo should have a pH factor between 4 & 6.5. Using a product in this range can repair problems as well as keep hair clean and soft.

You may wonder why a shampoo can range up to 6.5 on the pH scale, when the optimum state of hair, skin, and nails is in the range 4.5 to 5.5. The reason is that, during the rinsing and the drying process, water dilutes the pH level, because water has its own pH level.

The use of alkaline products on your hair will cause it to swell, lose strength, elasticity, and luster, resulting in more tangles and matting problems. To get a preferred style, it is sometimes necessary to use alkaline products. Examples include hair coloring, perms, and straightening. This is not a problem if, immediately after any major alkaline encounter, a shampoo and conditioner that is in the pH range of 4 to 6.5 is used to bring your hair back into shape.

To put this in perspective, there are only two tests as to whether a shampoo and/or conditioner is good, first, its pH level is between 4 & 6.5, and second, it leaves hair clean, soft, and lustrous after drying. The only exception to these two rules is that people that have a particular scalp problem will need to determine if any additional ingredient(s) are needed to manage their condition. For example, people who are prone to dandruff will need to make sure that an anti-dandruff ingredient is in the shampoo. That said, even dandruff shampoos should fall on the pH scale between 4 & 6.5.

Unfortunately, manufactures do not place their pH scale information on their products and most do not even post it on their websites. You can do an Internet search using the keywords “ph scale [your product]” and you might find someone who has tested your product. However, in matters so personal as hair, it is probably best to be skeptical of other people’s findings. There is a solution to this dilemma. You can test the pH level of any liquid with either test strips, or with an electronic pH meter.