Know Your Ingredients: Ensulizole

by Gio


What it is
Ensulizole, also known as Phenylbenzimidazole Sulfonic Acid, is a whitish beige powder.

What it does
Ensulizole is a sunscreen agent that provides mainly UVB and only minimal UVA protection. That’s why, to offer broad-screen protection, Ensulizole needs to be used in products together with ingredients that protect from UVA rays like Titanium Dioxide, Zinc Oxide, Mexoryl SX, Avobenzone and Tinosorb.
Although there aren’t many studies on the stability of Ensulizole when exposed to sunlight, it doesn’t seem to degrade much and may also partly prevent other sunscreen agents from degradation.
Ensulizole is water-soluble, so it feels light and not greasy on skin.

Side effects
Ensulizole is generally considered to be safe.


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Vonvon August 22, 2009 - 5:37 pm

I am beginning to enjoy more and looking forward to your Know Your Ingredients posts every week! It gives a short and comprehensive summary of those ingredients found in our skincare.

beautifulwithbrains August 23, 2009 - 11:51 am

I’m so glad you enjoy this kind of posts Vonvon. I hope they are useful to people and that knowing what ingredients do helps them choose the best skincare products 🙂

Vonvon August 24, 2009 - 5:53 am

All the scientific terms and chemical properties and characteristics, etc…sort of wake up the scientific mind of mine which has long been sleeping since I stopped working to be a full-time mom. 😉
.-= Vonvon´s last blog ..EOTD: Blue And Jades =-.

beautifulwithbrains August 24, 2009 - 12:02 pm

I’m glad Vonvon 🙂 I try to write in a scientific language but keeping it simple. But I’m always scared I may confuse some people.

farah dilla October 26, 2015 - 8:08 am

Does this cause cancer?

Gio October 26, 2015 - 5:46 pm

Farah, there is no proof that, in the small concentrations used in sunscreen, it causes cancer. The sun, however, most definitely does.

farah dilla October 27, 2015 - 1:13 am

Thanks for your answer..i am a bit concern since what i’ve read that it produces free radicals when exposed to sun light:( but i do love the product

Gio October 31, 2015 - 8:53 pm

If you’re worried about, just use an antioxidant serum. Antioxidants fight free radicals, and help us age better and slowly too.


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