heres a video I just watched
3 different products mentioned but only 2 are tested.
Ethos Graphene,Crystal Serum Light
Also mentioned is Dr.Beasleys,which is highlighted and some of the chemical properties are broken down and explained.
This may also answer some questions a few have(are you following along Dave S.)?
https://www.youtube.com/watch?v=sbfr35YkDzk
This is a rather lengthy video so allow plenty of viewing time.
For me the Crystal Serum Light seems to be the least expensive,but Ive also been looking at the 3M stuff,which is at least 2x the price.