As of now, there has been no conclusive evidence that any form of TD (or any other sunscreen filter) harms coral reefs or marine life
Iodide is non-reactive, and the reactive I2 species is required for the next step
10.1016/j.biochi.2011.09.008 Falentin H, Deutsch SM, Jan G, Loux V, Thierry A, Parayre S, Maillard MB, Dherbcourt J, Cousin FJ, Jardin J: The complete genome of Propionibacterium freudenreichii CIRM-BIA1T, a hardy actinobacterium with food and probiotic applications
While the current body of evidence has predominantly focused on fat versus lean mass, relatively few studies (mostly subgroup analyses) have examined SMI, ASMI, and physical performance