About this item Well-Absorbed Iron: Provides 25 mg of elemental iron per capsule in a non-constipating, well-absorbed form as iron bisglycinate Fight Fatigue: Helps fight fatigue and other signs of an iron deficiency, which can manifest as weakness, shortness of breath, dizziness, tinnitus, drowsiness, irritability, infrequent menstruation, and loss of libido Blood Building: An essential mineral for the formation of new red blood cells Certified For Sport: Supports high-performance nutrition programs and is NSF Certified for Sport Trusted: Thorne is chosen by champions and trusted by 100+ pro teams. Thorne is the only supplement manufacturer to collaborate with Mayo Clinic on wellness research and content. Thorne is also a proud partner of 11 U.S. Olympic Teams