Making your own boron concentrate is very simple. All you need to do is dissolve 6 grams (approx. lightly rounded teaspoon) of borax in 1-liter of high-quality water that does not contain chlorine or fluoride such as spring water, or distilled water and stored in a labelled glass jar with a plastic lid.

Keep the jar out of reach of small children.

The elemental content of boron in borax is 11.36%. In 6 grams of borax, there is 660 mg of boron. The remainder is sodium. There is about 203 teaspoons in a litre, and thus about 3.25 mg of boron in each teaspoon. If you are measuring borax with teaspoons, 6 grams of borax is approximately 1.5 teaspoons (5ml).

Dose

Standard dose = 1 teaspoon (5 ml) of the concentrate, which contains 25 to 30 mg of borax and provides about 3 mg of boron. Take 1 teaspoon per day mixed with drink or with food.

Loading dose = 1 teaspoon (5 ml) of the concentrate three times a day. This provides about 9 mg of boron.

Note: Currently, I do not recommend having more than 30 mg of elemental boron a day.

Toxicity

This concentrate is extremely safe. As you can see from the excerpt below, the LD50 values are exceedingly higher than what we share on this blog post and can be taken safely. The average intake from diet of Israelis is approx. 30 mg/day.

Excerpt from Agency for Toxic Substances and Disease Registry.

“Oral LD50 values for respective boron equivalents of boric acid or borax were 898 and 642 mg/kg in an unspecified rat strain (Smyth et al. 1969), 600 and 510 mg/kg in Sprague-Dawley rats (Weir and Fisher 1972), and 550 and 690 mg/kg in Long Evans rats (Weir and Fisher 1972). No deaths were reported in dogs exposed to a single dose of 696 mg boron/kg (3,977 mg boric acid/kg) and 738 mg boron/kg (5,549 mg borax/kg) (Weir and Fisher 1972). No single-dose LD50 studies in mice were available; however, mortality rates of 20 and 60% were observed in males given 14 daily doses of 2,251 and 3,671 mg boron/kg/day (12.9 or 21.0 g boric acid/kg/day) in the diet, respectively (NTP 1987), but not at 926 mg boron/kg/day (5.3 g boric acid/kg/day). These animals were lethargic and exhibited discolored spleen, liver, and renal medullae and hyperplasia and dysplasia of the forestomach (NTP 1987).”