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Potassium Cetyl Phosphate

What Potassium Cetyl Phosphate is & what it does

A gentle emulsifier that creates light, stable lotions and helps disperse UV filters evenly. It is mild and common in sunscreen bases.

What is Potassium Cetyl Phosphate and what does it do in sunscreen?

Potassium Cetyl Phosphate is a gentle emulsifier. Its job is to blend the oil and water phases into a stable lotion and to help disperse UV filters evenly through the formula, which matters for reliable sun protection. It is mild and very common in sunscreen bases.

Is Potassium Cetyl Phosphate safe?

Yes. It is a mild, widely used emulsifier that is well tolerated in skincare and sunscreen, and it is not flagged as an allergen in our data. It is used in small amounts to hold the formula together rather than to act on the skin. For most people it is considered safe as used.

Does Potassium Cetyl Phosphate clog pores?

Generally no. It is used in small amounts as an emulsifier and is not flagged as comedogenic in our data, so it is an unlikely cause of clogged pores. If a product is breaking you out, the richer oils and waxes in the formula are the more likely culprits.

Is Potassium Cetyl Phosphate a preservative?

No. It is an emulsifier, which keeps oil and water mixed, not a preservative that stops microbes from growing. The preserving in a sunscreen is handled by ingredients such as phenoxyethanol, the glycols, or ethylhexylglycerin. Potassium Cetyl Phosphate is only there to build a stable, even base.

What does Potassium Cetyl Phosphate do for UV protection?

It does not absorb UV itself, so it is not a sun filter. By emulsifying the formula it helps spread the actual UV filters evenly across the base, which supports more uniform coverage when you apply the product. In other words it makes the protective ingredients easier to deliver, rather than protecting on its own.

Sunscreens with Potassium Cetyl Phosphate

We rate 1299 sunscreens that contain it, showing the top 10 by overall score:

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