Some puffcorn is made with oat flour, flaxseed and chia corn. Vegan sources of ALA include plant oils, nuts, flaxseed (linseed), and soy. Fibre flax from flaxseed has been exported to the United Kingdom. Fiber is also recommended, foods such as oats, beans, ground flaxseed and berries are advised. It is particularly present in linseed (flaxseed) and hemp seeds. Exceptions include flaxseed (must be ground for proper nutrient absorption) and chia seeds. Canada's production of wheat, oats, flaxseed, and barley come mainly from this area. Pizzey's, which mills flaxseed, created a way into the North American omega-3 market. North Dakota harvests more than 90 percent of the nation's canola and flaxseed. The USFDA granted generally recognized as safe (GRAS) status for high alpha linolenic flaxseed oil. Ferulic acid glucoside can be found in commercial breads containing flaxseed. Whole flaxseed is then mixed with the flakes. Flaxseed sprouts are edible and have a slightly spicy flavor profile. Some advocate the use of food-grade flaxseed oil (a drying oil). The highest known concentration of ferulic acid glucoside has been found in flaxseed .