There was a program called fittested from muscle tech. It was rebranded from another trial program they had, but either way, this was cool because you were more or les going to get something random from them to tryout and review. The only issue is after one product, they seemed to just halt the program.
It’s essentially still advertised for people to sign up on their site, but they never send anything out.
Are there any other companies running programs like this ?