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