The length of time the human body takes to absorb vitamins primarily depends upon the specific vitamin and the individual's gastrointestinal health. Most vitamins are absorbed within minutes in the small intestine, but they must first travel through the stomach, where they are likely to undergo processing for about 3 1/2 hours, according to NutriStrategy.Know More
Vitamins are absorbed during the process of digestion. The National Digestive Diseases Information Clearinghouse explains that digestion works by moving food through the gastrointestinal tract, which begins in the mouth and ends with the large intestine. Digestion begins with chewing. The chewed food passes through the esophagus into the stomach, mixing with digestive juices that break down large molecules of food into smaller molecules. The smaller molecules are absorbed through the walls of the small intestine, making their way into the bloodstream either directly or indirectly.
Water-soluble vitamins, which include all the B vitamins and vitamin C, pass directly into the bloodstream. Fat-soluble vitamins, however, require further processing by the bile released into the small intestine, and they must enter the lymph vessels before entering the bloodstream, according to Helpguide. Four vitamins are fat-soluble: A, D, E and K.
Helpguide explains that absorption of some vitamins is affected by the presence of other vitamins or minerals and vice versa. For example, vitamin C helps the body absorb iron.Learn more about Vitamins & Supplements
It is recommended to avoid taking multivitamin with milk. Calcium can prevent the body from absorbing some of the ingredients from the tablet. Individuals should avoid combining a multivitamin with other products that have calcium, such as antacids with calcium, calcium tablets and other dairy products, according to eMedicineHealth.Full Answer >
The amount of vitamin E a person should take depends on age, according to WebMD. For example, males and females 14 years and older should take 15 milligrams a day, although breastfeeding women should take 19 milligrams.Full Answer >
The recommended dietary allowance (RDA) of magnesium a person should take depends on factors like sex and age; for example,Â adult males over 30 need about 420 milligrams per day, while adult females over 30 require about 320 milligrams of this mineral per day. However, young children and teenagers require different amounts of magnesium.Full Answer >
The amount of vitamin B12 you should take per day depends on your age. According to the National Institutes of Health (NIH) Office of Dietary Supplements, young children need the least vitamin B12 per day, whereas pregnant and breastfeeding women need the most.Full Answer >