COMPONENTS IN OUR FLAX HULL LIGNANS: *Note: NOTHING is added to our Flax Hull Lignans. These are all components of the natural shell. FLAX LIGNANS (SDG) -- Flax Hulls Linum usitatissimum. We offer extremely high quality concentrated flax hull lignans, containing large concentrations of Lignans (SDG). Lignans are a group of phytonutrients found in seeds and grains. Flaxseed is known for being the plant containing the highest concentration of Lignans known as SDG (secoisolariciresinol diglycoside). Most of the lignans in the flax seed are located in the hull that encased the seed. Our product contains only pure flax hulls, which have been mechanically separated from the flax seed. The resulting product is said to contain 70 times the amount of SDG lignans per gram as compared to the traditional ground up seed.