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http://nutraprointl.com/2009/04/05/difference-between-butter-and-butter-oil-2/
Why use Butter oil instead of Butter?
Grass-Fed Butter Oil® has high smoke point (~380 °F), which makes it ideal for high-temperature cooking such as sautéing. Whole butter contains milk solids that start to burn at a lower temperature, which can result in scorching while cooking and a burnt smell and taste to the food
Grass-Fed Butter Oil® is moisture free and has a longer shelf-life than butter. Great for travel
cooking with Grass-Fed Butter Oil® will give a rich flavor to the food