Why we use Sodium Hydroxide

↓ skip to summary

Sodium Hydroxide: A Safe and Essential pH Adjuster

Sodium hydroxide is a strong base used in cosmetics to balance pH levels and ensure product safety. While its name may sound intimidating, its role is essential in creating effective yet skin-friendly formulations.

Without proper pH adjustment, overly acidic skincare products can compromise the skin barrier, leading to irritation or even chemical burns. For example, alpha hydroxy acid (AHA) treatments require careful pH control to maintain efficacy without causing harm. Sodium hydroxide corrects pH levels precisely, allowing potent active ingredients to work optimally while keeping skin comfort in mind.

The Chemistry of pH Adjustment

Despite being listed on ingredient labels, there is no actual sodium hydroxide present in the final product. Instead, when added to an acidic formula, sodium hydroxide dissociates into sodium ions (Na⁺) and hydroxide ions (OH⁻).¹

The hydroxide ions play the crucial role of neutralising excess hydrogen ions (H⁺) in the formula. This reaction raises the pH and transforms hydrogen ions into water, safely balancing acidity.¹ Meanwhile, the sodium ions remain as plain salt—a harmless byproduct found naturally in the body and environment.

Why pH Balance Matters in Skincare

The skin thrives at a balanced pH, typically around 4.5–5.5. Ingredients like sodium hydroxide ensure that skincare formulations remain within this optimal range. When pH is too low, products can be harsh and damaging. If it's too high, actives may become less effective. Proper adjustment maintains the ideal balance between potency and skin compatibility.

A Safe and Necessary Ingredient

By the time a skincare formula is complete, sodium hydroxide has fully reacted, leaving behind a stable, well-balanced product. What remains is a touch of extra water, a trace of salt, and an expertly calibrated pH. This makes sodium hydroxide one of the safest and most useful ingredients in cosmetic formulation—allowing powerful actives to perform at their best while keeping skin protected.

references

1 Wong, M. Is Sodium Hydroxide Safe in Beauty Products? | Lab Muffin Beauty Science. Retrieved 17 September 2022, from Is Sodium Hydroxide Safe in Beauty Products?

explore more

Hydrating · Barrier Support

Hydroxypropyltrimonium Hyaluronate

Hydroxypropyltrimonium Hyaluronate is a cationic hyaluronic acid designed for long-lasting hydration and barrier support. Its positively charged structure…

read →