Our Vitamin U is best quality around the world, and the price is also most favorable.  Vitamin U is very extremely hygroscopic, so we use nitrogen-filled packing to make it damp, mildew, insect and moisture proofing. The moisture content can be controlled around 1%.
Vitamin U is not actually a vitamin, but is instead a term used to refer to a substance called S-Methylmethionine. It's found in several different types of food and is used as a naturopathic supplement to treat a variety of health problems.
S-Methylmethionine is found in both plants and animals, and it can also be made synthetically. The most common way to consume it is in liquid or spray form, but it can also be taken in tablet form or directly from foods. The most common natural sources are green cabbage leaves, alfalfa sprouts, spinach, kale, tomatoes, celery, wheat, turnips, radishes, and parsley. Some health experts recommend getting vitamin U from raw or fermented foods, since appears to be much more effective when cold, and cooking may make it not work as well.