I would like to read about the rejects as i make sun screen and fill many different brands
I cover with clothing and use Johnson and Johnson kids SPF 30 on ears and neck.
"SPF 30 product blocks 97% of rays, and an SPF 45 product blocks about 98% " you get the general idea
The issue is once you get to SPF 30 unless you go to a BLOCK there is not significantly more protection.
The reason use see back all the higher numbers is because there was a big government study that had a fatal flaw and had to be tossed and things like SPF 100 that were about to be banned caught a break.
The next big possible O-SHITE is micronized zinc health problems