"Nixtamalized refers to corn that has undergone the nixtamalization process, a traditional Mesoamerican method where dried corn kernels are soaked and cooked in an alkaline solution, typically made with lime (calcium hydroxide) or wood ash.
This process softens the corn, removes the inedible outer hull (pericarp), and significantly enhances its nutritional profile by increasing the bioavailability of essential nutrients such as niacin (vitamin B3), calcium, iron, and magnesium.
The resulting product, known as nixtamal, is then rinsed and ground into masa dough, which is used to make tortillas, tamales, and other traditional Mexican dishes.
Without nixtamalization, corn would be difficult to grind and lacks sufficient nutritional value, particularly in terms of niacin, which is crucial for preventing pellagra."
https://www.cnbc.com/2019/08/10/trump-is-ruining-our-markets-farmers-lose-a-huge-customer-to-trade-war----china.html