Potassium Phenylbenzimidazole Sulfonate: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: June 24, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What is Potassium Phenylbenzimidazole Sulfonate?

Potassium Phenylbenzimidazole Sulfonate, also known as 2-Phenylbenzimidazole-5-Sulfonic Acid, Potassium Salt, is a common ingredient found in many cosmetic products. It’s a mouthful, isn’t it? But don’t worry, it’s not as scary as it sounds!

This ingredient is synthesized in a lab, and its primary function in cosmetics is to absorb and filter harmful UV rays. It works by absorbing these rays and converting them into less damaging heat, protecting your skin from potential harm.

While you might find Potassium Phenylbenzimidazole Sulfonate sold on its own, it’s more commonly found as part of a wider formulation of ingredients within a product. It’s a team player, working alongside other ingredients to keep your skin safe and healthy.

Who Can Use Potassium Phenylbenzimidazole Sulfonate?

Good news! Potassium Phenylbenzimidazole Sulfonate is suitable for all skin types. Whether you have dry, oily, or combination skin, this ingredient can help protect your skin from harmful UV rays.

And if you’re a vegan or vegetarian, you’re in luck! Potassium Phenylbenzimidazole Sulfonate is a synthetic ingredient, meaning it’s not derived from animals or animal by-products. So, you can use products containing this ingredient without any worries.

As for expecting or breastfeeding moms, while there’s no specific information suggesting that Potassium Phenylbenzimidazole Sulfonate is harmful, it’s always a good idea to consult with your healthcare provider before introducing new products into your skincare routine.

Potassium Phenylbenzimidazole Sulfonate’s Cosmetic Benefits/Uses

The benefits and uses listed in this section pertain specifically to the cosmetic applications of Potassium Phenylbenzimidazole Sulfonate. It’s important to note that this ingredient may have other uses in different industries, but those are beyond the scope of this article. The benefits listed here are based solely on its official functions as a UV absorber and UV filter.

  • Protection against harmful UV rays: As a UV absorber, Potassium Phenylbenzimidazole Sulfonate has the ability to absorb ultraviolet (UV) light. This is particularly beneficial in cosmetic products as it can protect the skin from the harmful effects of UV radiation. UV radiation can cause skin damage, premature aging, and increase the risk of skin cancer. By absorbing these harmful rays, Potassium Phenylbenzimidazole Sulfonate helps to shield the skin, thereby reducing these risks.
  • Prevention of sunburn: In addition to absorbing UV light, Potassium Phenylbenzimidazole Sulfonate also functions as a UV filter. This means it can block or reduce the amount of UV light that reaches the skin. This is particularly useful in sun protection products, as it can help to prevent sunburn. Sunburn is caused by excessive exposure to UV light, so by filtering out these rays, Potassium Phenylbenzimidazole Sulfonate can help to prevent this painful and damaging skin condition.
  • Enhancement of product stability: By absorbing and filtering UV light, Potassium Phenylbenzimidazole Sulfonate can also enhance the stability of cosmetic products. UV light can cause some ingredients in cosmetic products to degrade or lose their effectiveness. By protecting these ingredients from UV light, Potassium Phenylbenzimidazole Sulfonate can help to maintain the effectiveness and extend the shelf life of these products.

Potential Side Effects/Adverse Reactions

It’s important to note that side effects and reactions to the topical application of Potassium Phenylbenzimidazole Sulfonate can vary significantly from person to person. This is due to individual differences in skin type, sensitivity, and overall health.

While Potassium Phenylbenzimidazole Sulfonate is generally considered safe for topical use, some potential side effects may include:

  • Redness
  • Itching
  • Burning sensation
  • Skin irritation
  • Allergic reactions

If you experience any of these side effects while using a product containing Potassium Phenylbenzimidazole Sulfonate, it’s recommended to discontinue use immediately and consult a healthcare professional or dermatologist. They can provide guidance on how to manage these symptoms and suggest alternative products if necessary.

Adverse reactions to Potassium Phenylbenzimidazole Sulfonate are relatively rare, but they can occur, especially in individuals with sensitive skin or allergies to similar compounds.

Given the potential for side effects, it’s crucial to perform a patch test before using any new cosmetic product. This simple step can help you avoid unwanted reactions and ensure the product is safe for your skin.

Comedogenic Rating

Comedogenicity refers to the potential of a substance to cause comedones, which are skin blemishes often associated with acne. These blemishes occur when pores become clogged with excess sebum and dead skin cells. In the context of cosmetic ingredients, a comedogenic rating is used to indicate how likely an ingredient is to clog pores and potentially lead to acne breakouts.

Potassium Phenylbenzimidazole Sulfonate has a comedogenic rating of 0. This means it is non-comedogenic and is not likely to clog pores or contribute to acne breakouts. This rating is based on the molecular structure and properties of Potassium Phenylbenzimidazole Sulfonate, which do not promote the clogging of pores.

Given its non-comedogenic nature, Potassium Phenylbenzimidazole Sulfonate is suitable for individuals who are prone to acne or breakouts. It can be used in cosmetic formulations without the risk of exacerbating these skin conditions.

Conclusion

Potassium Phenylbenzimidazole Sulfonate serves primarily as a UV absorber and UV filter in cosmetic products. These functions are crucial in protecting the skin from harmful ultraviolet radiation, which can lead to premature aging and skin cancer.

Despite its beneficial properties, Potassium Phenylbenzimidazole Sulfonate is not widely popular in the cosmetic industry. It is similar to other UV-absorbing ingredients, but it is not as commonly used, possibly due to the availability of more well-known alternatives.

Overall, Potassium Phenylbenzimidazole Sulfonate is safe to use. Its non-comedogenic nature makes it suitable for all skin types, including those prone to acne. However, as with any ingredient, it is always recommended to perform a patch test before incorporating it into a skincare routine, to ensure no adverse reactions occur.

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