An overdose or high intake of B-Vitamins can trigger heart palpitations, high blood pressure, or major complications in patients with congestive heart disease, above-normal thyroid, or above-normal adrenal functions. And as mentioned, it may trigger, or aggravate existing nervous conditions, insomnia, anxieties, or stress disorders in younger, more hormone-driven individuals... 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...