← Blood tests
Bioavailable Testosterone
Advanced wellnessalso —
What it isThe sum of free testosterone plus testosterone loosely bound to albumin, which dissociates readily and is available to tissues.
DoesRepresents the most accurate measure of testosterone that can actually act on receptors.
GoodA high bioavailable testosterone signals strong tissue-level androgen action.
BadLow bioavailable testosterone drives hypogonadal symptoms — fatigue, low libido, muscle loss — even if total testosterone reads normal.
- Standard
- Lab-specific.
- Optimal
- Upper third of reference range (higher is good within range)
- Modifiers
- SHBG and albumin levels drive variation.
How to optimize
- Lifestyle
- Resistance training, sleep, weight loss.
- Diet
- Adequate protein, healthy fats; zinc, magnesium, vitamin D.
- Supplements
- Same as free testosterone.
- Peptides
- Kisspeptin-10, gonadorelin.
- Drugs
- Testosterone replacement, hCG, clomiphene.
Reference ranges are general adult lab norms; optimal ranges are editorial picks from the longevity literature — not medical advice. Always interpret results with your physician.
within Men's Hormones