The mineral essential for the formation of red blood cells is iron. Iron plays a crucial role in the synthesis of hemoglobin, the protein found in red blood cells that binds and transports oxygen throughout the body. Without adequate iron, the body cannot produce enough healthy red blood cells, leading to conditions such as anemia, which can cause fatigue and weakness. Iron is obtained from dietary sources, including meats, beans, and leafy green vegetables. Proper iron levels are vital for maintaining overall health, supporting energy levels, and ensuring the efficient delivery of oxygen to tissues.