Why are multivitamin and mineral supplements important? Nutrients from diet alone may be insufficient: Many Americans have nutritional gaps in their diets - even when they try to eat a healthy diet. Multivitamins can help fill those gaps. Why take Multiplex-1 without Iron? It's formulated for the most sensitive systems: This supplement is formulated with activated, better absorbed coenzyme forms of vitamins B2 and B6, flush-free inositol hexaniacinate (Niacinol), true GTF-chromium (GlucoChrome),