Things are dose dependent. All of the Boron supplements I find are rather low like less than or equal to about 10mg. 1/4 teaspoon per day though dissolved in water is between 115mg-158mg depending on the measuring spoon and how level or round your scoop is. That is a huge delta in dose. I have heard of 50mg-60mg tablets but have never actually seen them for sale.
In the late 1980's and early 1990's as a high school athlete the ones sold to athletes where 3mg-6mg - again far lower than what you get in a rather common dose of 1/4 teaspoon of borax in 1 liter of water sipped through the day!
I took 1/4 teaspoon per day the first 3 weeks then started to get diarrhea. I reduced it to 1/8 of a teaspoon a day for 2 weeks and all of the diarrhea went away completely. Some days I take 1/8 teaspoon some days I take a 1/4 and I am fine.
In theory anything is better than not taking borax so if someone was really sensitive or had IBS you could start at 1/16th of a teaspoon and slowly over weeks and months build up to 1/4 teaspoon. Evidence is showing that observational with individuals that you can get a lot of health benefits at varying does but the higher the dose the more consistent the results seem to be.
In post menopausal women a lot of individuals have found that reversing osteoporosis takes around 150mg of borax, vit and 400mg-600mg of magnesium per day to reverse it and that is a far higher dose than someone without osteoporosis needs. In those without severe fluorosis or osteoporosis that have healthy bone mass, 50mg per day seems to be the sweet spot but again you need magnesium and vitamin D3 in the diet. It is thought that enzymes and mineral metabolism is how boron works it's many benefits. Some people probably get enough minerals in their diet but for most Americans minerals and Vitamin D3 and iodine are almost always low. Iodine helps to keep your body from depositing fluoride in your bones.
Abdominal Pain, Bloating
I too have found a huge, albeit unexpected, improvement in my gut since taking borax powder (This didn't happen whenI was taking borax supplements in tablet form). Pretty much since the day I ran out of the tablets and used 'cleaning' borax (pure with no additives) I have noticed this effect. I told my mother about it as she too has had major gut issues that have caused her serious pain for over 20 years. She has been diagnosed with IBS and told basically that she has to live with it. She too has have next to no issues since taking borax powder (1 tsp dissolved in 1 l of water, then add 1 tsp of this liquid to a glass of water to drink every day, sometimes 2x a day.)
Abdominal Pain, Bloating
Prioris, Bill, Ted, and TimH..etc: Thank you all so much for your informative posts on borax. They have explained my mild die-off reaction (herxheimer effect) from using it. I shall cut back a bit on the intake and continue on.
For the record, my apparent die-off reaction consists only of morning diarrhea.
The apparent positive effects that I have noticed recently have been that my chronic abdominal bloating has all but completely disappeared (I've literally had that for decades). Along with the bloating, general abdominal pain and discomfort have also all but disappeared, which included daily, middle-of-the-night deep burning pain in my gut.
Please note, that along with starting the borax regime, I have also started the “water cure” (Google it), which involves properly hydrating your body. These two remedies have removed a dark cloud of dismal depression that many digestive-related issues have caused me for many years. It feels like I have a new life. Cheers and blessing to all!!