The crossover design of the study will allow each subject to act as their own control. Since the interventions will be given in therapeutic dosage rather than a larger pharmaceutical dose it is anticipated that there should be no carryover effect to the next intervention. The washout periods between treatments will be one week each. It is anticipated that the study will begin September 1, 2005 and would last for a period of 6 to 9 weeks. Duration of study for each subject will be 3 weeks. Patients will be enrolled in the trial upon their answering of a posted advertisement. During the initial encounter, the prospective subjects will be informed as to the purpose of the trial, how the trial will be conducted, what their time commitment will be and any possible potential for harm This information will be explained by the study coordinator and informed consent will be obtained if the patient is agreeable. Subjects will fill out a baseline questionnaire detailing their supplement use as well as other demographic information before commencing the study. Prior supplement use should not impact on the relative bioavailability of either supplement since the crossover design will ensure prior use will impact on both treatments equally. Visit number one will determine diurnal variation values for the serum iron as well as establish iron status. Individuals in each of the groups will then be randomly allocated to either SuppleFem® or Materna® by selecting coloured poker chips from a bag to assign equal probability for each subject to fall into either of the two treatments. Two colors will be chosen to represent the two interventions. The chips will be placed in an opaque bag by the study coordinator and subjects will be asked at the commencement of the second visit (first intervention) to withdraw a chip from the bag as part of the randomization process. The colour will identify which intervention group the subject will be placed in. For visit number three, subjects will receive the opposite treatment from the one they took in visit two. Subject blinding is not possible due to the physical forms of the interventions; Materna is a large pill whereas Sprinkles are a granular powder. This study will be highly controlled and subjects will be closely observed while ingesting the supplements to ensure that the entire precisely measured amount is consumed. Further, serum measurements are objective in nature and cannot be influenced by the subject.