And make sure its not blend-in nano-particle zinc oxide, apparently it blends in by crossing into your bloodstream. I've been mostly using the fern pills that a

And make sure its not blend-in nano-particle zinc oxide, apparently it blends in by crossing into your bloodstream. I've been mostly using the fern pills that are advertised to stop sun damage. They absolutely prevent and even reverse a sunburn, but I have no idea if they are actually preventing dna damage that leads to melanoma.