Rutin and or hesperidin, when low, frequently result in predictable, and even side-specific medical problems that include a greater risk for vascular degeneration, bruising capillary fragility, nose bleeds, varicose veins, periodontal bleeding, hemorrhoids and aneurism, with few individuals exhibiting optimal levels, despite mega-supplementation. One reason is the chemical interaction of other nutrients with flavonoids which can have a synergistic, or inhibiting effect. Various drugs also interact with bioflavonoids and affect their efficacy... 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...