Just to point out- avobenzone and Parsol 1789 are actually one and the same ingredient. Parsol 1789 is merely avobenzone's trade name. Also- Avobenzone needs to be paired with a stabilizer like Octocrylene, Oxybenzone (although this is a photo-allergen) and Tinosorb also theoretically stabilizes it. Otherwise it breaks down exponentially after being exposed to sunlight (not a good trait in a sunscreen!) and it should never be combined with Octinoxate as this speeds up its degradation.