I thought my post ‘boron not boring’ was quite novel but today found this link:
Good info from research. Boron can be Got in higher doses from borax; okay in the USA, not so easy to find since EU directives changed its status. But the real borax mineral is available on eBay UK.
Or boron supplement in triple bioavailable form can be found from amazon UK; I take 3-6mg daily as a supplement.