Hoi Marijan,
Hieronder de link naar een gedegen artikel:
http://www.health-science-spirit.com/borax.htm
Uit het artikel van deze link:
In some countries (e.g. Australia, NZ, USA) borax can still be found in the laundry and cleaning sections of supermarkets. There is no "food-grade" borax available or necessary. All borax is the same and "natural", and usually mined in California or Turkey, whether it has been packed in China or any other country. The label usually states that it is 99% pure (or 990g/kg borax) which is safe to use, and is the legal standard for agricultural grade borax. Up to 1% mining and refining residues are permitted. Boric acid, if available, may be used at about ⅔ the dose of borax, it is not for public sale in Australia.
Firstly dissolve a lightly rounded teaspoonful
(5-6 grams) of borax in 1 litre of good quality water. This is your concentrated solution, keep it out of reach of small children.
Standard dose = 1 teaspoon (5 ml) of concentrate. This has 25 to 30 mg of borax and provides about 3 mg of boron. Take 1 dose per day mixed with drink or food. If that feels right then take a second dose with another meal. If there is no specific health problem or for maintenance you may continue indefinitely with 1 or 2 doses daily.
If you do have a problem, such as arthritis, osteoporosis and related conditions, cramps or spasms, stiffness due to advancing years, menopause, and also to improve low sex hormone production, increase intake to 3 or more spaced-out standard doses for several months or longer until you feel that your problem has sufficiently improved. Then drop back to 1 or 2 doses per day.