Question: what sunscreen ingredients are harmful?
Answer: Benzophenone-3, also know as Oxybenzone. ... 
Avobenzone, also a benzophenone. ... 
Cylcopentasiloxane / Cyclomethicone. ... 
Formaldehyde, Diazolidinyl urea, Quaternium-15, DMDM Hydantoin and Hydroxymethylglycinate. ... 
Homosalate. ... 
Methylisothiazolinone. ... 
Microbeads. ... 
Nano particles.