In your bloodstream, most testosterone is “locked up” by two proteins: SHBG (Sex Hormone Binding Globulin) and Albumin.
- Bound Testosterone: About 98% of your testosterone is stuck to these proteins and cannot enter your cells.
- Free Testosterone: Only about 2% is unbound. This is the “active” hormone responsible for muscle growth, bone density, libido, and mood regulation.
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