If you rinse your rice, you're washing the vitamins down the drain. Look at a bag of Mahatma or Carolina. The ingredient list reads rice, niacin, iron, thiamin and folic acid. Below the cooking directions it says to retain vitamins, do not rinse before or drain after cooking. Ben's Original parboiled carries the same line. White rice has had the bran milled off, along with the B vitamins and iron. Enriched rice puts them back as a powder dusted onto the outside of the kernel. The vitamins sit on the surface of the grain, and the first rinse washes them off. FDA's standard for enriched rice has a test. Rice that can't survive a 30-second swirl in water and keep 85% of its vitamins has to have the don't-rinse line, and that's most of the rice on the shelf.