I think I didn't arrive This formula should give an SPF of around 35-40, but the actual value must be measured in the lab only. If you want SPF50, you need to increase it. Tinosorb M to 8-10% (with PMMA Booster )and want to know if Bisoctrizole (Compare to Tinosorb M ) 5% PMMA Booster (SPF/Color Booster) 5% will get SPF at 50PA+++?