Grass-finished beef comes from cattle that has eaten nothing but grass and forage for their entire lives. Grass-fed, on the other hand, may be used to label meat from cattle that were started on a grass diet, but have received supplemental grain feed or are finished on a fully grain-based diet. Grass-finished beef is an excellent source of protein, iron, zinc, phosphorus, and selenium, as well as vitamins B6, B9, and B12. What’s more, research shows grass-finished meat is higher in cancer-fighting conjugated linoleic acid (CLA), desirable fatty acids like omega 3s, and nutrients like vitamin D, magnesium, and potassium.