Magnesium is required for ATP production - the body's main source of energy. MAG365 BF + Calcium is formulated with highly absorbable ionic magnesium citrate, plus electrolytes like calcium and potassium and vitamins C, B6, D3 and K2. It can be taken pre-workout for energy, or after workout for recovery. We have 3 tubs of 210g MAG365 BF + Calcium to be won worth €28.95 each.