Bisdisulizole disodium
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Bisdisulizole disodium (USAN[1], Neo Heliopan® AP, INCI disodium phenyl dibenzimidazole tetrasulfonate) is a water soluble chemical which is added to sunscreens to absorb UVA rays. It is marketed by Symrise.
Bisdisulizole disodium is not approved in the United States by the FDA, but is approved in the European Union since the year 2000[2] and other parts of the world.[3]