屬水性化學性紫外線吸收劑，危險指數為 3/5(越高越不好)[2]。
[2] 張麗卿，『優質保養品選擇策略』，聯經出版社，2003/07/10。
Ensulizole是一種紫外線UVB防曬劑，也能吸收很小部分的UVA波段，屬於水溶性化學防曬劑，缺點是曝露於陽光下會產生自由基，從而損傷皮膚DNA，嚴重時有致癌的可能。
About ENSULIZOLE: Known to produce free radicals when exposed to sunlight, leading to damage of DNA, this UVB protector may have the potential to cause cancer.
Source: https://www.ewg.org
添加量少於百分之4是安全的。
The Food and Drug Administration (FDA) reviewed the safety of Phenylbenzimidazole Sulfonic Acid and approved its use as an active ingredient in Over-the-Counter (OTC) sunscreen drug products at concentrations up to 4%.
信息來源
https://cosmeticsinfo.org/ingredient/phenylbenzimidazole-sulfonic-acid