Whole grain barley is naturally low in phosphorus. In fact, barley has 35% less phosphorus than oats (USDA). Consuming barley instead of oats is a natural way to eat less phosphorus in each serving. Burl Barley Granola is made with only rolled barley as the grain source. By using barley rather than oats, we’ve lowered the phosphorus content in each serving of our granola.