Hi. I disagree with @hardartery when it comes to boron.
You have NOT tested your shbg yet, so you really do not know where you stand. Trying to lower what might already be low could create more problems for you.
But back to boron – I have/had sky high SHBG of 120. I tested boron for more than 4 weeks, with blood work before and after and found that boron did lower my SHBG – but because of my starting levels, it wasn’t enough.
You really should check your blood levels before you start trying to change them.