I've had times in the past where I had very high total with suboptimal free testosterone. Turns out I had high sex hormone binding globalization.

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Bingo. Free is correct. Albumin comes into play too, but it’s a much weaker binder than SHBG. You could have 1,000 ng/dL total, but if your SHBG is too high, you’ll look like a vegan.

I found that boron is an excellent nutrient to mitigate that effect.

Yes