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The recommended pH level for most hair products is between 4.5 and 5.5. This pH range is optimal for maintaining healthy hair and scalp conditions. Hair and skin have a natural acidity that helps to protect against bacteria and environmental damage. Products that fall within this range help to preserve this natural balance, preventing excessive dryness and damage to the hair cuticle, which can occur with products that are too alkaline.

Using products with a pH that is too high can lead to the lifting of the hair cuticle, resulting in increased porosity and potential damage. Conversely, a slightly acidic pH helps to keep the hair cuticle closed, promoting shine and reducing frizz. This balance is particularly important in hair care, as it supports overall hair health and enhances the effectiveness of treatments and styling products. It also helps maintain the scalp's health by providing an environment that discourages fungal growth, thereby reducing the risk of dandruff and other scalp conditions.