Premier Performance Electrolyte Cookies. Electrolytes are essential for heart function, muscular contraction, blood vessel dilation, nerve impulse conduction, kidney filtration, gut motility, internal pH regulation, and hydration. A lack of these essential minerals might cause poor muscle function and performance difficulties. Sweating causes horses to lose electrolytes while working. Sweating is an important part of thermoregulation, and it is known that electrolytes are lost through perspiration. However, electrolytes can be lost through normal bodily functions (such as urination and defecation), and daily feed, forage, and water intakes alone may not meet a horse's electrolyte requirements; thus, it is recommended to feed an electrolyte supplement to horses that work or sweat a lot, especially during hot weather. Does not contain any chemicals, fillers, binders, or other forbidden compounds as defined by the FEI.