New Roots Herbal Iron Bisglycinate - 35 mg - An amino-acid chelate iron supplement for maximum bioavailability and free from the common side effects of sore stomach, constipation, diarrhea, and cramps. Many iron supplements are have limited intestinal absorption as well as interfere with other nutrients and block their absorption. New Roots Herbal Iron Bisglycinate has an absorption rate of up to three times that of other forms of iron, as it’s absorbed via an alternative pathway within the intestinal mucosa. This means it will also not interfere with other forms of dietary iron.