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Boron is found in many foods including avocado, red apples, peanuts, raisins, prunes, pecans, potatoes, and peaches. While trace amounts of boron are thought to be important for several metabolic functions, no Recommended Daily Allowance (RDA) has been established. The Tolerable Upper Intake Level (UL) for boron (defined as the maximum dose at which no harmful effects would be expected) is 20 mg per day for adults and pregnant or breastfeeding women over 19 years of age.
Although there's some evidence that vaginal use of boric acid suppositories has potential in the treatment of vaginal yeast infections, given the lack of scientific support, the ubiquity of boron in food and water, and the safety concerns with excessive intake, an oral boron supplement is probably one to skip. If you're considering using boron in any form, be sure to talk with your healthcare provider first to weigh the pros and cons. *