01/27/2026
🧠 High Testosterone Doesn’t Matter If It’s Locked Away
Your testosterone might read 800 ng/dL on labs, yet you feel flat. Low libido. Low energy. Weak in the gym. And you’re told, “Your levels are fine.”
What’s often missed is SHBG, S*x Hormone Binding Globulin.
SHBG is a liver-produced protein that binds testosterone and makes it inactive. That means you can have high total testosterone but low free (bioavailable) testosterone, the form your body actually uses.
There are two key measures:
• Total testosterone (bound + unbound)
• Free testosterone (unbound, active)
If SHBG is high, free testosterone drops, regardless of total levels.
Several lifestyle factors drive SHBG up:
• Low-carb / keto diets (studies show SHBG can rise 20–30%)
• Chronic overtraining without recovery
• Persistent stress → elevated cortisol
• Being too lean (below ~10% body fat)
When cortisol stays high, SHBG increases and free testosterone falls.
That’s why some lean, disciplined men still feel low-drive and underpowered.
What helps:
• Adequate carbs to support training demand
• Planned deloads and recovery
• Avoiding chronic caloric stress
• Targeted micronutrients (e.g., boron has shown SHBG-lowering effects in short-term studies)
One study using 10 mg boron daily for 7 days reported:
• SHBG ↓ ~9%
• Free testosterone ↑ ~28%
• Estradiol ↓
If you’re getting bloodwork, don’t stop at total testosterone.
You need the full picture:
• Total Testosterone
• Free Testosterone
• SHBG
Common target ranges (context-dependent):
• Total T: 600–1000 ng/dL
• Free T: ~20–25 ng/dL
• SHBG: ~20–40 nmol/L
At Aspire Elite, hormone optimization means interpreting how your body actually uses hormones, not just reading a single number.
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