Mustard seed, yellowmustard.pngnutritional value per 100 g (3.5 oz)energy 1, 964 kj (469 kcal)carbohydrates34.94 gsugars 6.89 gdietary fiber 14.7 gfat28.76 gsaturated 1.46 gmonounsaturated 19.83 gpolyunsaturated 5.39 gprotein24.94 gvitaminsvitamin a equiv. (0%) 3 gthiamine (b1) (47%) 0.543 mgriboflavin (b2) (32%) 0.381 mgniacin (b3) (53%) 7.890 mgvitamin b6 (33%) 0.43 mgfolate (b9) (19%) 76 gvitamin b12 (0%) 0 gvitamin c (4%) 3 mgvitamin e (19%) 2.89 mgvitamin k (5%) 5.4 gmineralscalcium (52%) 521 mgiron (77%) 9.98 mgmagnesium (84%) 298 mgphosphorus (120%) 841 mgpotassium (15%) 682 mgsodium (0%) 5 mgzinc (60%) 5.7 mgother constituentswater 6.86 gunitsg = micrograms mg = milligramsiu = international unitspercentages are roughly approximated using us recommendations for adults.Source: usda nutrient databasemustard seeds are the small round seeds of various mustard plants. The seeds are usually about 1 to 2 millimetres (0.039 to 0.079 in) in diameter and may be colored from yellowish white to black. They are important spice in many regional foods and may come from one of three different plants: black mustard (brassica nigra), brown indian mustard (b. Juncea), or white mustard (b. Hirtasinapis alba). Grinding and mixing the seeds with water, vinegar, or other liquids, creates the yellow condiment known as prepared mustard. An archaic name for the seed is eye of newt. Often misunderstood for an actual eye of a newt, this name has been popularly associated with witchcraft ever since it was mentioned as an ingredient to a witch's brew in shakespeare's famous play macbeth.[1][2][better source needed]