Supplement indicated for athletes: Magnesium contributes to the maintenance of normal muscles and bones. Vitamin B6 contributes to the reduction of tiredness and fatigue. Vitamin B1 contributes to normal energy-yielding metabolism. Vitamin D3 contributes to the normal absorption and utilization of calcium and phosphorus. Lemon-flavored effervescent tablets. Directions for use: Take 1 tablet daily during periods of high-intensity activity. Dissolve in a glass of water (150 ml) and drink once the bubbling has stopped.