Hydrogen fuel cells

I was wondering if any of these hydrogen fuel cell kits sold online are proven or are legit. I have tried to do some research on them and the principal sounds solid but I am not sure which companies are liars and which may be reputable. Any information would be greatly appreciated.

they all work,and will even take you to the moon.

BYE!

They don’t work. The principle is not solid, it’s hogwash. Phony science. These things are nothing but a scam. Ask yourself this question: If they worked, why aren’t they standard equipment on all new cars?