Summary
Treatment modalities given for symptoms rather than for treatment of correctly diagnosed diseases by definition must have no effect since the same symptoms (headache) might be produced by different and often opposite conditions (low vs. high blood pressure). The same applies to prevention of conditions unprofessionally grouped into artificial categories, such as "heart disease" or "cancer". They have different and often not entirely understood etiologies. Substances, therefore, advertised as universally preventive modalities must be completely ineffective in order not to potentiate the effect of the true cause of the disease.
Analysis
Such modalities, nevertheless, will never loose popularity since they first, empower patients by providing the illusion of control and second, do not have side effects (good for business).
