The acid most commonly found in hair conditioner is citric acid.
Why is Acid Used in Hair Conditioner?
Hair conditioners are frequently formulated to be slightly acidic for several key reasons:
- Protonation of Keratin: A low pH helps to protonate the amino acids in keratin, the protein that makes up hair. This process gives the hair a positive charge.
- Strengthening Hydrogen Bonds: The positive charge encourages the formation of more hydrogen bonds between the keratin scales on the hair shaft. This leads to a more compact and smoother hair structure.
- Cuticle Smoothing: The slightly acidic environment helps to flatten and close the hair cuticle. This reduces frizz, increases shine, and makes the hair feel smoother.
- Neutralizing Alkalinity: Many shampoos are slightly alkaline. Conditioners help to restore the hair's natural pH balance after shampooing.
Citric Acid and Other Acids
While citric acid is a common choice, other organic acids may also be used in hair conditioners to achieve the desired pH level. These acids serve a similar purpose in terms of hair conditioning and pH balance.
