According to common formulations and reference materials, Citric acid is often used as a buffer in shampoo to maintain a balanced pH level.
Why pH Balance is Crucial for Hair Health
Shampoo formulas are frequently alkaline, meaning they have a high pH. However, our hair and scalp have a naturally slightly acidic pH. Using a shampoo that is too alkaline can disrupt this natural balance, potentially leading to:
- Damage to the hair cuticle, making hair appear dull and prone to breakage.
- Scalp irritation or dryness.
- Alteration of the hair's texture and properties.
The Role of Buffers in Shampoo
To counteract the alkalinity and protect hair and scalp health, pH balanced shampoos are formulated. A buffer is a chemical substance added to these shampoos specifically to stabilize and maintain the pH within a desired range, typically around 5.5 or lower. This helps ensure the product is gentle and effective without causing harm.
Common Buffer Used: Citric Acid
As highlighted in industry references, Citric acid is a widely used buffer in shampoo formulations.
- Function: Citric acid effectively controls the pH level of the shampoo.
- Range: It is capable of managing pH at various values, often within the range of 3 to 7, making it ideal for bringing the pH of alkaline formulas down to the desired acidic or near-neutral range (like 5.5 or lower for pH-balanced products).
By using Citric acid as a buffer, manufacturers can create shampoos that cleanse effectively while preserving the natural integrity and health of your hair and scalp.
