Mg Magnesium Citrate is an ergonomic gel formulated with highly bioavailable magnesium (magnesium citrate), manganese, and vitamin B1, providing 100% NRV. Magnesium is involved in more than 300 different enzymatic reactions, contributing to:\ Reducing tiredness and fatigue\ The normal functioning of the muscles and nervous system\ Muscle relaxation (electrolyte balance)\ Normal heart function\ Energy-yielding metabolism and protein synthesis\ Vitamin B1 is necessary for normal psychological functioning and energy-yielding metabolism. Directions for use: Take 1 sachet (before/during/after) sports practice.