And be prepared for constipation and/or nausea. Iron Supplements. Certain foods can help improve your oxygen levels in the blood naturally. These acids will increase the absorption of iron from food quite a bit. Chuck beef, dark turkey meat, ground beef and top sirloin also provide considerable amounts of iron. Consume More Oysters. Lentils, various types of beans, blackstrap molasses and nuts also contain a good amount of iron. If you eat meat, fish or poultry in the same meal as plant sources of iron, the percentage of iron absorbed from the plant source increases. Increase consumption of vitamin C In order for iron to be absorbed well, it needs to turn into ferritin. 3. The great news is that it is usually temporary! Especially while pregnant, high iron levels are needed in order to properly transfer oxygen throughout the body and boost the effectiveness of the immune system. Ferritin is a protein that is in charge of storing iron in our bodies. If you are in deficiency of iron, then it is a good idea to have 2-3 servings of these iron-rich foods every day. This image may not be used by other entities without the express written consent of wikiHow, Inc.