And they MUST say on advertisements that the supplement is not to diagnose or treat any disease. If a person is sick, it is far better to talk to a physician, not the supplement aisle. The exception would be nutrient deficiency like Vitamins or Iron.
For instance, researchers found that a civilization who lives by the ocean and eat only fish had no heart issues. They surmised that Fish Oil prevents heart problems. Within the last year, researchers had thousands take Fish Oil and thousands take a placebo. There was no difference, they STILL had heart issues after a few years. So, the Fish Oil study proved that taking Fish Oil does nothing other than give you Fish Belches (aka Fish Breath).
TS