Magnesium is an important component of all soft tissues and bones in the human body.       It also plays an important role in neuromuscular conduction, ion transport and calcium channel reactivity (cardiac function). A lack of magnesium can result in weakness, muscle cramps, tachycardia, nausea, headache and mental disturbance.       Vitamin B6 is essential for the normal functioning of the brain, nervous and muscular system.