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Boron is a mineral that has been found in both food and in the environment. People have often taken boron supplements as medicine. The mineral is used for building strong bones, treating osteoarthritis, as an aid for building muscles and increasing testosterone levels, and for improving thinking skills and muscle coordination. Women have sometimes used capsules containing boric acid inside the vagina to treat yeast infections. People have also applied boric acid to the skin as an astringent or to prevent infection, or use it as an eye wash. Boron was also used as a food preservative between 1870 and 1920, and during both world wars.

Also known as:  Acide Borique, Anhydride Borique, B (symbole chimique), Borate, Borate de Sodium, Borates, Bore, Boric Acid, Boric Anhydride, Boric Tartrate, Boro, Numéro Atomique 5, Sodium Borate

Diseases and Conditions

Boron holds anti-inflammatory properties and promotes bone health, especially in women and has been found to significantly improve would healing. It has been used to treat symptoms of menopause, including promoting a strong sex drive. Taking boron also reduced the risk of vitamin-D deficiency in clinical studies.


Boron is likely safe for adults and children when used orally below 20mg per day. Boric acid can be safely used for up to 6 months. Doses higher than 20mg per day may affect male fertility. Boron is unsafe for all when consumed in high doses and can cause poisoning; symptoms of which include skin peeling, skin inflammation, tremors, irritability, convulsions, headaches, diarrhea, depression, vomiting, and even death. Boron is likely safe for pregnant and breastfeeding women aged 19-50 if taken in doses less than 20mg per day; higher doses may lead to birth defects. Side effects are rare if less than 10mg of boron is consumed. Boron should not be taken by individuals with kidney disease, hormone sensitive cancers and conditions.

Medication Interactions

Concomitant administration may increase serum estrogen levels.

Supplement and Food Interactions

Boron supplements may reduce urinary excretion of magnesium and heigten serum levels in women. Taking boron may also lessen serum phosphorus concentrations in some people.


Dietary intake of boron varies.

Diets considered to be high in boron provide approximately 3.25 mg boron per 2000 kcal/day.

Diets considered to be low in boron provide 0.25 mg boron per 2000 kcal/day.

The Tolerable Upper Intake Level (UL), the maximum dose at which no adverse effects would be expected, is:

  • 20 mg per day for adults and pregnant or lactating women over 19 years.
  • For adolescents 14 to 18 years and pregnant or lactating women 14 to 18 years, the UL is 17 mg per day.
  • For children 9 to 13 years, the UL is 11 mg per day;
  • Children 4 to 8 years, 6 mg per day
  • Children 1 to 3 years, 3 mg per day.
  • A UL has not been established for infants.

For vulvovaginitis, boric acid powder 600 mg once or twice a day intravaginally for 2 weeks has been used.

For prevention of recurrent Candida (yeast) infections, 600 mg twice weekly has been used.


Boron is a trace element that is sometimes added to food to help preserve it.

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