Sodium Hydroxide

Strong base that acts as a pH adjuster in cosmetics. Added in microdoses to bring the formula acidity to the required level.

Evidence by route

Topical application

Weak evidence. In vitro data, open-label studies, or expert consensus.

In finished cosmetics it only works as a pH adjuster, not an active. After neutralizing acids it converts into a neutral salt.

Irritation potential

Low

Allergen risk

Low

Pregnancy

Safe

Suitable for

OilyDrySensitiveCombinationNormal

Is Sodium Hydroxide safe during pregnancy?

Sodium Hydroxide is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.

What skin types is Sodium Hydroxide for?

Sodium Hydroxide suits: oily, dry, sensitive, combination, normal.

What is Sodium Hydroxide and what does it do in cosmetics?

Strong base that acts as a pH adjuster in cosmetics.

What's the INCI name for Sodium Hydroxide?

The INCI name is Sodium Hydroxide. It may also appear as: Гидроксид натрия, NaOH, Caustic Soda.

Published: April 14, 2026 · updated: May 7, 2026