MEGAFOOD Blood Builder (30 tablets)Description MegaFood Blood Builder is a top selling product for a reason: it is clinically shown to increase iron levels without common gastrointestinal side effects such as nausea or constipation. It is crafted with nourishing, whole foods, like beets and organic oranges, plus folic acid and B12 for healthy red blood cell production, and vitamin C to support iron absorption, to provide the best iron supplement for those with sensitive stomachs.