Lori,
Regarding the terms sun block and sun screen, we have tested the product on surfers and lifeguards, and ourselves. It works when applied as directed. Technically its a sun block, as zinc oxide is the main ingredient for that function.
As far as testing goes, only if the product is labeled as a sun screen and "sun protection" chemicals listed on the FDA's registry are being used does the product need to be tested (in a nutshell, I did a ton of research on that issue and its very complicated).
The only references to sun screen are used for seo, the product is labeled correctly. But I do appreciate your concern. What I am really wanting to know: do the descriptions engage you/the customer when reading about the products?