Beef is a rich source of several essential nutrients, including:

• Protein: Beef is an excellent source of high-quality protein, which is important for building and maintaining muscle mass, as well as for overall health.
• Iron: Beef is an important source of iron, which is necessary for the production of hemoglobin and myoglobin, which transport oxygen throughout the body.
• Zinc: Beef is a good source of zinc, which is important for immune function, wound healing, and cell growth and division.
• Vitamin B12: Beef is an excellent source of vitamin B12, which is essential for the formation of red blood cells and the proper function of the nervous system.
• Vitamin B6: Beef contains vitamin B6, which is important for cognitive development, immune function, and red blood cell formation.
• Vitamin B3: Beef is a good source of Vitamin B3 which is also known as Niacin, important for energy metabolism, DNA repair, and healthy skin and nerves.
• Vitamin D: Beef is a good source of Vitamin D which is important for bone health, immune function, and mental well-being
• Creatine: Beef also contains creatine which is important for muscle strength, endurance, and overall energy.
• Omega-3 fatty acids: Some cuts of beef contain small amounts of omega-3 fatty acids, which are important for heart health, brain function, and overall well-being.
• Selenium: Beef contains selenium, a mineral that is important for the function of the thyroid gland, DNA synthesis, and the immune system
• Vitamin K2: Beef also contains Vitamin K2 which helps in proper absorption of Calcium and maintaining heart and bone health.

It's worth noting that the nutrient content of beef can vary depending on the cut, quality, and preparation method of the meat. Some cuts of beef are leaner, while others are higher in fat, and the cooking method can also affect the nutrient content.