Ingredient dictionary

Sodium Acetate

Also listed as: Sodium ethanoate

Sodium acetate is the sodium salt of acetic acid, the sour compound found in vinegar. Its main job in a formula is to help keep pH steady. It is on the label of 16 products in our library. Checked against our library November 6, 2026.

What Sodium Acetate does

Buffers the formula to hold a steady pH
Helps fine-tune pH during making
Stabilizes the water-based part of the formula

Sodium acetate is made by neutralizing acetic acid with a sodium base, such as sodium hydroxide or sodium carbonate. The result is a white, crystalline salt that dissolves easily in water. It is a simple, well-known compound used in labs and in a range of everyday products.

Formulators use it mainly to control pH. Paired with a weak acid, it forms a buffer that resists sudden pH shifts when other ingredients are added. It is odorless and dissolves cleanly in water, so it adds little scent or feel of its own to a light serum.

Good for

Suits serums and water-based formulas that need a pH that stays steady. It is generally well tolerated.

Frequently asked questions

Is sodium acetate the same as vinegar?

No. Vinegar is a dilute solution of acetic acid. Sodium acetate is the salt that forms when acetic acid is neutralized with a sodium base. It is not sour and is generally odorless, even though both start from acetic acid.

Is sodium acetate safe for sensitive skin?

It is generally well tolerated and is not a common irritant. Any ingredient can cause a reaction in some people, so patch testing a new serum on a small area first is a sensible step.