I always found it strange that there was no variation in guidelines by sunscreen active ingredient and formulation. Surely active ingredients that rest atop the skin and block the UV rays are going to be more likely to be removed by sweat, water, and toweling than ingredients that soak into the skin more and absorb the UV? And isn’t that also going to vary significantly by formulation too?
I always found it strange that there was no variation in guidelines by sunscreen active ingredient and formulation. Surely active ingredients that rest atop the skin and block the UV rays are going to be more likely to be removed by sweat, water, and toweling than ingredients that soak into the skin more and absorb the UV? And isn’t that also going to vary significantly by formulation too?