@NNight nuts:
Haidut:
Boron is HIGHLY estrogenic. The bodybuilding community was crazy about it in the 1990s, but then they found out first hand that it raises estrogen (I think all 3 types) and dumped it. Boron has similar effects to cadmium, nickel, cobalt, etc and they are all estrogenic and carcinogenic in higher doses.
Peat is right that unless you are deficient you'd better not mess with it. See below for a study in men.
http://link.springer.com/article/10.1007%2FBF02785299
"...Supplementation with 10 mg B/d for 4 wk resulted in 84% of the supplemented dose being recovered in the urine. Plasma estradiol concentrations increased significantly as a result of supplementation (51.9±21.4 to 73.9±22.2 pmol/L;p<0.004) and there was a trend for plasma testosterone levels to be increased. However, there was no difference in plasma lipids or the oxidizability of low-density lipoprotein Our studies suggest that the absorption efficiency of B is very high and estimation of the urinary B concentration may provide a useful reflection of B intake. In addition, the elevation of endogenous estrogen as a result of supplementation suggests a protective role for B in atherosclerosis."