What it is
Dipotassium phosphate is a water-soluble potassium salt of phosphoric acid. In cosmetics its main job is buffering, holding the formula at a stable, intended pH so that active ingredients and the emulsion stay reliable over time. It is often paired with its more acidic counterpart, potassium phosphate, to form a buffer system.
Safety & warnings
As a simple, commonly used buffering salt at low cosmetic levels it is generally well tolerated and is not associated with comedogenicity. Irritation is uncommon at normal use levels.
Origin & sourcing
Synthetic inorganic salt manufactured by neutralizing phosphoric acid with a potassium base.
Questions everyone asks
What is dipotassium phosphate used for in cosmetics?
It is a buffering and pH-adjusting salt that keeps a formula at a stable pH so the product and its actives stay reliable.
Does it have skincare benefits on its own?
It is a functional ingredient rather than an active; its role is to stabilize the formula rather than to treat the skin directly.