Our expert says:
Hi Gigi, thank you for the question.
Most SPF products are aimed at blocking both UVA and UVB rays and typically the best ingredients for UVA is zinc oxide and titanium dioxide.
The following table (below) gives one an indication of the different ingredients and their specific UV blocking effects:
Drug Name Concentration, % Absorbance
Aminobenzoic acid Up to 15 UV-B
Avobenzone 03-Feb UV-A I
Cinoxate Up to 3 UV-B
Dioxybenzone Up to 3 UV-B, UV-A II
Ecamsule* 2 UV-A II
Ensulizole Up to 4 UV-B
Homosalate Up to 15 UV-B
Meradimate Up to 5 UV-A II
Octocrylene Up to 10 UV-B
Octinoxate Up to 7.5 UV-B
Octisalate Up to 5 UV-B
Oxybenzone Up to 6 UV-B, UV-A II
Padimate O Up to 8 UV-B
Sulisobenzone Up to 10 UV-B, UV-A II
Titanium dioxide 2 to 25 Physical
Trolamine salicylate Up to 12 UV-B
Zinc oxide 2 to 20 Physical
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