No the FDA is not stupid, but they are under political pressure and that alone should cast serious doubts on what they okay and what they disapprove of.
My wife took the Ambrotose who has been sick just about all he life. Doctors and meds did NOT help her. Mannatech's Ambrotose is one thing that did. As far as a "scam?" And a pyramid? You sound like a quack Pyramids are not just illegal in individual states, they are illegal in the USA, period. Plus. The structure of a pyramid is any business because the owner makes the real money, and the ones at the bottom really make the least money and they do most of the work. And no, I'm not a distributor. And as far as being a "user" being offensive.
I bought it for my wife and it works where the doctors and meds don't.
My Mum has been a Diabetic for 40 years and has had numerous eye bleeds. I bought her Ambrotose and very shortly thereafter, her bleeding improved or stopped.
I was privileged to hear about Mannatech when it arrived in South Africa many years ago and studied the product and the 'manufacturing' process in-depth. It is an incredible product that can change millions of lives. If you do not agree with the product, that is your choice, but please be mindful of posting defamatory remarks that will stop people from using it.