Boron dosage for children

I have just started my children on the Iodine protocol, daughter aged 9 and son aged 5, and I am thinking about adding Boron to the mix as it sounds like it works well with the iodine, but I can't find much information on the dosage for children. Lots of the information I find says not to use it for children at all, although I know that many people on this forum use it successfully. Can someone please give me some information on dosage? Thanks