Keeping up your vitamin D levels is vital, I do 4000 to 8000 IU daily with fatty foods for bioavailability.
I second the lycopene comments. Add tomatoes to your green smoothies.
That's pretty much it for oral. UVB/UVA protection on the other hand helps a lot.
Edited by Nate-2004, 24 April 2018 - 06:42 PM.