While symptoms resulting from spinal alignment problems, poor posture, or unconsciously tensing muscles in the neck or shoulder area may benefit from chiropractic intervention, there are also organic or chemical factors that are capable of precipitating a general uptight or tense disposition, in which case nutritional remedies with muscle relaxant properties may be considered. The two most important minerals to use for that purpose are calcium and magnesium, while a B-Vitamin Complex should used with caution, or avoided entirely since higher amounts encourage muscle tension and a stressed-out emotional disposition... 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...