Boron is a hard, metalloid micromineral that is essential to human health.
Orthomolecular-oriented physicians commonly prescribe doses of 6 - 9 mg of boron per day for therapeutic purposes (especially when treating arthritis and osteoporosis). This is the amount of boron that experts regard as the optimal daily intake. Often this dosage is reduced to 3 mg per day once the original symptoms for which boron is prescribed have abated.
Also, studies have shown that 3mg of boron per day reduces urinary excretion of calcium and magnesium, especially when dietary magnesium is low, and can increase bone mass and density.