Low iron is the #1 cause of fatigue in women, and iron deficiency is one of the most experienced nutritional deficits in the United States. Iron serves a critical purpose in our bodies, helping to transport oxygen throughout the body. Effects felt by low iron and subsequent low oxygen levels range from mental fatigue and confusion to compromising your immune system's ability to fight infection. Blood Builder is designed to help you improve your iron levels and restore your lost energy. It can be difficult to get enough iron you need through your diet alone, especially for those who adhere to vegetarian or vegan lifestyles. Women especially can benefit from the boost this unique formula provides.