Ken and Nancy,
The FDA can and will ban whatever supplement they like, should they choose to do so. More than likely they will limit the dosages one can buy/consume to very low levels. EG... the maximum amount of Vit.C might be 100mg/tab. We must never, ever let the FDA or any other governmental agency dictate what we can and cannot consume as long as it is relatively safe. Since we are not consuming these food additives as medicines or drugs we do not have to prove efficacy for any disease... to do so would be to invite the wrath of the pharmaceutical industry claiming we are indeed selling drugs for specific illnesses. In an impartial court I don't think the FDA would have any right to ban or regulate vitamins, minerals, enzymes, or other natural substances that are found in nature and not patentable, but finding an impartial judge/court might be a problem, especially with our freedoms eroding daily in other areas of our lives.