While it's not always the case, most shampoos are actually alkaline, not acidic. This means they have a pH level higher than 7. The pH of shampoo typically ranges from 3.0 (acidic) to 9.0 (alkaline).
However, there are some shampoos on the market that are formulated with an acidic pH. These shampoos are often marketed as being gentler on hair and better for maintaining color. The ideal pH for hair is between 4.5 and 5.5, which is slightly acidic.
Here are some factors that affect the pH of shampoo:
- Ingredients: Shampoos contain various ingredients, some of which are acidic and others are alkaline. The overall pH of the shampoo depends on the combination of ingredients used.
- Purpose: Some shampoos are specifically designed to be acidic or alkaline to achieve a particular result. For example, shampoos for color-treated hair are often acidic to help seal the hair cuticle and prevent color fading.
It's important to note that the pH of shampoo can vary between brands and even between different products from the same brand. Always check the label to see the pH of the shampoo you are using.
Here are some examples of acidic shampoos:
- Redken Acidic Bonding Concentrate Shampoo: This shampoo is specifically designed to strengthen and repair damaged hair. It contains citric acid, which helps to lower the pH of the hair and strengthen the bonds within the hair strands.
- Redken Acidic Color Gloss Sulfate Free Shampoo: This shampoo is designed to protect color-treated hair and prevent fading. It contains a blend of acidic ingredients that help to seal the hair cuticle and lock in color.
Here are some examples of alkaline shampoos:
- Most shampoos containing Sodium Laurel Sulphate: This is a common ingredient in many shampoos and is known to be alkaline.
