Potassium and magnesium are the most important minerals found within the heart. They contribute to heart muscle contraction through their role in energy production, and help maintain the electrical charge of the cells. Biotherapy Cellular Magnesium-Potassium Chelates provide potassium and magnesium chelated to the Krebs cycle intermediates so they are more readily absorbed by the body. What are some of the symptoms of magnesium deficiency? Magnesium deficiency can affect virtually every organ system of the body. With regard to skeletal muscle, one may experience twitches, cramps, muscle tension, muscle soreness, including back aches, neck pain, tension headaches and jaw joint (or TMJ) dysfunction. Also, one may experience chest tightness or a peculiar sensation that he can't take a deep breath. Sometimes a person may sigh a lot. Symptoms involving impaired contraction of smooth muscles include constipation; urinary spasms; menstrual cramps; difficulty swallowing or a lump in the throat-especially provoked by eating sugar; photophobia, especially difficulty adjusting to oncoming bright headlights in the absence of eye disease; and loud noise sensitivity from stapedius muscle tension in the ear. Other symptoms and signs of magnesium deficiency include insomnia, anxiety, hyperactivity and restlessness with constant movement, panic attacks, agoraphobia, and premenstrual irritability. Magnesium deficiency symptoms involving the peripheral nervous system include numbness, tingling, and other abnormal sensations, such as zips, zaps and vibratory sensations.