Ingredient dictionary

Sodium Phosphate

Sodium Phosphate is a simple salt made from phosphoric acid and sodium that mainly works as a buffer, helping keep a formula's pH steady. It is on the label of 23 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Sodium Phosphate does

Keeps the formula's pH steady
Acts as a buffer against pH shifts
Helps the product stay stable over time

Sodium Phosphate is made by mixing phosphoric acid with a sodium source, such as sodium hydroxide, until the acid is balanced. The result is a salt that dissolves easily in water. Similar phosphate salts are also used in foods and household products.

Formulators use it mainly to hold pH in a comfortable range. Skin and hair are slightly acidic, and a formula that drifts too far from that can feel less pleasant or hold together less well over time. Because it dissolves into the water part of the formula, it adds little scent, color, or texture of its own.

Good for

Suits leave-in products such as creams, lotions and styling formulas, where a steady pH matters.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is sodium phosphate safe in skincare?

Sodium phosphate is generally well tolerated and is used in many leave-in formulas. If you have very sensitive skin or a known reaction to an ingredient, patch test a new product first. Check with a dermatologist if you have concerns.

Why do skincare products contain sodium phosphate?

Formulators add it to keep a product's pH steady. A stable pH helps the formula feel comfortable on skin and hair and keeps it consistent from first use to last. It is a quiet helper, so you will rarely see it doing anything obvious.