There are two types, brown and golden, which are equally nutritious. A typical serving size for ground flax seeds is 1 tablespoon (7 grams). Just one tablespoon provides a good amount of protein, fiber and omega-3 fatty acids, in addition to being a rich source of some vitamins and minerals.
A visual comparison of the two will show that the nitrogen fed seed is fuller, shinier, and hardier than the organic flax, even though both are very clean. Organic flaxseed is more expensive to buy, chiefly because the cleaning process is more difficult.