"he's rich therefore he has no incentive to scam anyone" is not a good heuristic, though it will help you get a degree from Trump University.
Even his supplements are just concoctions of stuff anyone can buy, the ingredients are fully transparent. Anyone can follow what he does without giving him a penny.
Disagree. What he does is run a YouTube channel that appears to do that. That makes it an ideal vehicle to advertise supplements with little research or scientific backing to an uninformed and trusting audience.
Again, if he is trying to run a supplement scam with an NW north of $1B, he needs some pointers. Dude could announce an AI startup tomorrow and get more funding than any of his current companies would make in a lifetime.