I would say adjust to your body's requrement. To have therapeutic effect of a mineral, high daily dosages may be neccesary for a while. Maintenance is different. Daily for me is vit C, magnesium, potassium.
Borax a couple of times a week, 40 mg or so. I am probably the one that took most boron in the world, except the mine workers and guinea pigs:)
Hormones doing just fine.