In addition, manufacturing, distributing, and selling these chemicals without the proper registrations and labeling can cause the initiation of legal actions. The few discussions I have had with "healthy product" distributors have centered around liability.
You may find the "Vitamin O" story interesting... They took out a full page advertisement in USA Today which was read by some students at Georgetown University. They contacted the FDA to verify the claims made, and the FDA ended up shutting down the manufacturing and distribution of this product, and penalizing them with a heavy fine.
The price of the "stabilized oxygen" products has remained stable, and there seems to be quite an opportunity for profit with them. I don't know if they are made from the powder, or if they simply dilute the liquid sodium chlorite from concentrate. It is possible to test for impurities, but this testing is expensive.