Complex Iron is iron in its highly bioavailable bisglycinate form, paired with vitamin C and B vitamins - built for athletes with high demands on performance and recovery. Every red blood cell needs iron to form. Without enough of it, your body can't produce enough hemoglobin - the protein that carries oxygen to your muscles and organs. The result shows up fast: fatigue, lower output, slower recovery. Iron also contributes to normal energy metabolism and the normal function of the immune system - two systems that hard training puts under constant load. Performance athletes - and women in particular - are among the groups most at risk of iron deficiency. Blood loss during menstruation combined with high energy expenditure can drop iron stores quickly and amplify every problem that comes with it. The formula is built on synergy. Iron bisglycinate in chelated form absorbs significantly better than common iron forms and doesn't irritate the gut. Vitamin C from a natural source measurably increases that absorption. And once the iron is in, the active forms of B6, B9 as Quatrefolic®, and B12 as methylcobalamin handle the rest - so your body can turn it into red blood cells as efficiently as possible.