Recommended Dietary Allowance (RDA): Average daily level of intake sufficient to meet the nutrient requirements of nearly all (97%–98%) healthy individuals often used to plan nutritionally adequate diets for individuals.These values, which vary by age and sex, include the following: DRI is the general term for a set of reference values used for planning and assessing nutrient intakes of healthy people. Intake recommendations for nutrients are provided in the Dietary Reference Intakes (DRIs) developed by an expert committee of the Food and Nutrition Board (FNB) at the National Academies of Sciences, Engineering, and Medicine. Fasting plasma concentrations of boron in postmenopausal women range from 34 to 95 ng/mL (3.14 to 8.79 mcmol/L). Most studies suggest that urinary boron levels correlate with boron intakes. īoron status is not routinely measured in clinical practice. Boron is excreted mainly in the urine, and small amounts are excreted in the feces, sweat, breath, and bile. The lack of substantial changes in blood boron levels in response to large increases in dietary intakes suggests that the body maintains boron homeostasis, likely by increasing urinary excretion, but the regulatory mechanisms for boron homeostasis have not been identified. Boric acid is the main form of boron in blood, urine, and other body fluids. īoron does not accumulate in most body tissues, but bone, nails, and hair have higher boron levels than other body tissues, whereas fat has lower levels. However, very little is known about how or where in the gastrointestinal tract absorption occurs. The body absorbs about 85%–90% of ingested boron. Most ingested boron is hydrolyzed to boric acid within the gastrointestinal tract. īoron is present in foods and beverages as inorganic borates as well as mono- or di-sugar-borate esters, such as calcium fructoborate. However, it might have beneficial effects on such functions as reproduction and development, calcium metabolism, bone formation, brain function, insulin and energy substrate metabolism, immunity, and the function of steroid hormones (including vitamin D and estrogen). īoron is not classified as an essential nutrient for humans because research has not yet identified a clear biological function for boron. It is a structural component of plant cell walls and is required for plant growth, pollination, and seed formation.
Introductionīoron is a trace element that is naturally present in many foods and available as a dietary supplement.
For a general overview of Boron, see our consumer fact sheet on Boron. This is a fact sheet intended for health professionals.
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