A person seeking to increase his red blood cell count can take vitamins and minerals such as vitamins B6 and B12, as well as iron supplements, suggests the San Francisco Chronicle. Vitamin E helps form red blood cells and is found in many vegetables.
Red blood cell counts can be raised by eating some foods that are rich in vitamins and minerals, advises HowStuffWorks. Chicken, fish and beef liver have high levels of iron, which is important to red blood cell levels because it is used to create hemoglobin or proteins onto which oxygen attaches. Without iron, red blood cells are too small and ineffective. When the body does not receive enough vitamin B12 or folic acid, the red blood cells are too large to move through veins and die quickly. Spinach is rich in both iron and folic acid, helping blood cells grow to the right size. Beets are rich in folic acid as well.
Some vitamins enable the body to absorb other vitamins and minerals better, making them an important aspect raising red blood cell levels, explains HowStuffWorks. Vitamin C helps the body absorb the B12 found in animal-based foods while also helping absorb the iron found in plants. Some foods rich in vitamin C that aid in this absorption include whole grains and legumes.