Beef is an excellent source of total protein and key amino acids such as leucine. Beef’s protein content is also complemented by other muscle-building nutrients such as creatine and zinc. Grass-fed beef is generally leaner, but that withstanding there’s no difference in terms of protein quality. Grass-fed beef is also touted for having more omega-3 fats when compared with conventional beef. in addition to beef grab your protein by the nuts steaks and roasts, beef protein isolate is now available to people who want to reap the benefits of beef protein in protein powder form.