the method for abstracting high levels of β - glucan from a grain product such as oat or barley grain to produce a β - glucan product containing at least about 18 % by weight β - glucan is provided . the β - glucan product can be produced as an agglomerated food additive having at least about 18 % by weight β - glucan . methods are provided for enriching a food product with the β - glucan agglomerated food additive to produce an enriched resulting food product .