Naturopathica iron tablets are a low constipating form of iron (from Iron II glycinate) with added vitamin C and Broccoli for increased absorption. 1 capsule contains 100% of your RDI of Iron. While many Iron supplements are made from ferrous (iron) sulphate, or iron amino acid chelate which can cause irritation in the gastro-intestinal tract, stomach cramps and constipation. We have picked ingredients to: – Low constipating form of iron.– Iron sourced from Broccoli.– Support energy levels.– Added vitamin C to support absorption.– Supports healthy red blood cell production.– Gluten Free.