Bioavailability vs. Biostimulators: Which is better?

Has anyone actually tried these products before? I’m trying to figure out if this is just some high-end snake oil or if there's actual science backing it up.
Is this stuff even safe to use?

http://www.zracenja.akcije.biz/zastita.htm

When you read through it all, everything sounds perfectly logical, but still...

Is it just me, or does absolutely nobody seem to get how much natural radiation is actually out there?