IThere was no evidence of toxicity in people given 10mg of boron
a day for long periods, concluded this study. In healthy people,
boron is rapidly absorbed and then excreted in the urine.
Another study  put eleven postmenopausal
women onto a diet delivering 0.3mg of boron a day, then gave them
a daily 3.0gm boron supplement. Although the researchers had effectively
increased the women's boron intakes tenfold, their blood plasma
boron levels only increased by half. This suggested that the body
was good at taking what boron it needed then excreting the rest.
In individuals with kidney problems, boron intake, as with any
mineral supplement (particularly potassium) should be carefully
monitored as impaired kidney function could reduce excretion,
resulting in boron accumulation.
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Ed.- The Tolerable Upper Intake Level for boron
set by the US Food and Nutrition Board of the Institute of Medicine
for adults over the age of 18 years has been established at 20mg/day
 Hunt,CD et al. American Journal of
Clinical Nutrition 1997;65(3):803-13
 Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic,
Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum,
Nickel, Silicon, Vanadium and Zinc. Institute of Medicine: National
Academy Press, Washington, DC, 2002.
(14108) Von Burg,R. Journal of Applied