While some trials showed Zinc Lozenges to be able to provide relief with sore throats, other studies showed only marginal results with cold-related symptoms, and none in regard to flu symptoms. The same mixed results can be expected when using zinc for the relief of symptoms from herpes, AIDS, or other infections. Whenever larger amounts of any nutrients are used for the symptomatic relief of medical symptoms, they become drugs, and as such become capable of triggering drug-like side effects or adverse reactions. Both, excessive and deficient zinc levels are associated with several types of cancer... Full Text

Manganese may help with some symptoms of Parkinson's disease such as muscle rigidity and twitching...
Research shows that phytosterols such as beta-sitosterol may help normalize the function of natural killer cells and T-helper lymphocytes...
Iron deficiency may be suspect with some forms of ADHD. 84% of children with ADHD were found to have abnormally low levels of ferritin...
A high intake of B Vitamins can trigger heart palpitations, HBP, major complications in patients with congestive heart disease...