Xtreme Electrolyte Matrix is a complex of electrolytes containing calcium phosphates and potassium., necessary for the proper course of metabolism. Potassium, due to influence on hydration of cells regulates the volume and stabilizes the osmotic pressure, acting as a calcium antagonist increases the permeability of cell membranes. It also maintains the correct acid-alkaline balance. Calcium is the building substance of bones and teeth, an activator of a number of enzymes, including ATPases, releasing ATP energy, reduces the permeability of cell membranes (stimulated, however, by the action of potassium hydroxide). Deficiencies of potassium (hypokalaemia) appeares insomnia, headaches, spasticity skeletal muscle hyperactivity, skin dryness and constipation. Deficiencies of calcium affect bone diseases and dental health. Xtreme Electrolyte Matrix is a part of the supplements by Fitness Authority.