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    Should we monitor free estradiol E2 in men on TRT?

    I'll keep this simple. What matters is free test, not total. Free T3, not total. Free (active) Vitamin D, not total. Magnesium RBC, not serum total. I feel like the more we learn, the more we realize that the free, or active, form of hormones/ minerals is what matters. So is free E2 what really...
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