Iron Asporotate 18 mg from Solaray contains iron that has been combined with aspartic acid, citric acid and orotic acid, which occur naturally in whey protein concentrate. This supplement is a full range amino acid chelate that does not contain any soy or yeast. Symptoms of iron deficiency include fatigue and weakness. Women who are or have been pregnant or a post-menopausal are among those susceptible to iron deficiency.