How much flaxseed can I use in a gluten free flour mixture.

For most baked goods replace 10-30% of the dry ingredient weight with roasted milled flaxseed. For breads you can replace up to 30% of the dry ingredient weight with roasted milled flaxseed. For muffins and granola bars one can replace up to 50% of the dry ingredient weight with milled roasted flaxseed.