Title: Iron polymaltose
Content:  The drug is absorbed in the small intestine, primarily in the duodenum and jejunum. Absorption occurs via a controlled, active mechanism. No passive diffusion takes place, which ensures that practically no unbound (to transferrin) iron reaches the blood. The absorbed iron is primarily stored in the liver as ferritin (protein used for iron storage) and subsequently made available to the body for various functions, primarily for incorporation into the red blood cells' hemoglobin, thereby transporting oxygen in the blood.
Title: Human iron metabolism
Content:  The absorption of dietary iron is a variable and dynamic process. The amount of iron absorbed compared to the amount ingested is typically low, but may range from 5% to as much as 35% depending on circumstances and type of iron. The efficiency with which iron is absorbed varies depending on the source. Generally, the best-absorbed forms of iron come from animal products. Absorption of dietary iron in iron salt form (as in most supplements) varies somewhat according to the body’s need for iron, and is usually between 10% and 20% of iron intake. Absorption of iron from animal products, and some plant 
Title: Human iron metabolism
Content:  is in the form of heme iron, and is more efficient, allowing absorption of from 15% to 35% of intake. Heme iron in animals is from blood and heme-containing proteins in meat and mitochondria, whereas in plants, heme iron is present in mitochondria in all cells that use oxygen for respiration. Like most mineral nutrients, the majority of the iron absorbed from digested food or supplements is absorbed in the duodenum by enterocytes of the duodenal lining. These cells have special molecules that allow them to move iron into the body. To be absorbed, dietary iron can be absorbed as part of a 
Title: Fumonisin B1
Content:  Much research has been done on toxic effects of FB<SUB>1</SUB> in animals. In vivo studies indicate that liver and kidneys are the main target organs. Fumonisins are poorly absorbed, rapidly eliminated and not metabolized in animals. In pigs and rats there is a wide distribution of FB<SUB>1</SUB> and small amounts have been found to accumulate only in liver and kidneys. In vervet monkeys, some FB<SUB>1</SUB> is partially hydrolyzed in the gut.
Title: Iron preparation
Content:  becomes part of the iron pool in the body. Upon stimulation, the reduction of iron storage Fe3+ in the enterocyte to Fe2+ ferroportin allows the passage of iron through the cell membrane for export. In the blood, ferroportin is then converted to transferrin to reach other tissues. The gastrointestinal (GI) absorption process depends on many factors, including the dosage form, dose, endogenous erythropoiesis process and diet. The most significant factor regulating iron uptake is the amount of iron present in the body. Iron absorption increases with sufficient iron storage and vice versa. Increased erythrocyte synthesis also stimulates iron absorption in the gut. Therefore, oral bioavailability of iron varies greatly, ranging from less than 1% to greater than 50%. Uptake of iron can be enhanced by dietary heme iron and vitamin C, while inhibited by calcium, polyphenols, tannins and phytates.
Title: Fenbendazole
Content:  Fenbendazole is poorly absorbed from the gastrointestinal tract in most species. The in laboratory animals exceeds 10 g/kg when administered orally.
Title: Fumonisin B1
Content:  FB1 is taken orally via food. Overall, FB1 is poorly absorbed, less than 6%. Absorption of orally administered fumonisin B1 (10 mg/kg body weight) to rats is low (3.5% of dose) but rapid (Tmax = 1.02 h). FB1 does not significantly permeate through the human skin and hence has no significant systemic health risk after dermal exposure.
Title: Fumonisin B1
Content:  After absorption, some appears to be retained in liver and kidneys. For rats that were fed diets containing fumonisins for several weeks, the concentrations of the fumonisins in the kidneys were approximately 10-fold higher than in the liver. Plasma distribution of the absorbed dose conformed to a two-compartment open model and the tissue (liver, kidney) concentration time results were consistent with a one-compartment open model.
Title: Hexachlorocyclopentadiene
Content:  HCCPD absorption in the body occurs mostly through the lungs, gastrointestinal tract and skin. Overall the levels of HCCPD in blood were lower when administered through food compared to when inhalation was used. This may indicate a poor absorption in the gastrointestinal tract due to binding to the gastrointestinal contents. When HCCPD is absorbed, it is distributed to the liver, kidney and lungs. The organ with the highest concentration differs when comparing rats and mice. The highest concentration in rats is found in the kidney versus in the liver of mice.
Title: Phosmet
Content:  The distribution of the compound can be observed and analyzed at every dosage in a variety of tissues. The areas that display the highest level of activity can be found in the liver and the whole blood as this is where the major metabolic process takes place. The lowest level of activity for the compound can be observed in the bone and fat of the individual.

Question: where is fe best absorbed in the body?
Answer: in the duodenum.
the duodenum.