Instant Testosterone Test
+ Eli app
Free testosterone shapes energy, strength, mood, libido, recovery, and long-term health. See yours in 20 minutes—anytime, anywhere.
Free testosterone measurement
Saliva-based test
Real-time results
AI-powered app (iPhone only)
FREE VS TOTAL TESTOSTERONE
Understanding testosterone.
Not all testosterone is the same. Your body produces testosterone, but only a small fraction of it is free and biologically active.¹ ²
Free testosterone powers your whole day.
Think of testosterone as your body’s chief performance officer. It’s actively regulating:
Protein synthesis, power output
Mitochondrial function, drive
Focus, confidence, resilience
Growth, repair, deep sleep
Libido, sexual vitality
Bone and metabolic health
Represents all testosterone in your bloodstream. Most of it is bound to proteins like SHBG (sex hormone–binding globulin) and albumin. Bound testosterone can’t easily enter cells or activate receptors, so it’s not a perfect reflection of how your body actually feels and performs.
This is the small, unbound portion, typically less than 2% of your total. It’s the testosterone that’s active in your tissues, driving energy, libido, mood, and muscle function.
Eli is the only product that tracks free testosterone, giving an accurate picture of how your hormones are working day-to-day.
1- Rosner, W., Auchus, R. J., Azziz, R., Sluss, P. M., & Raff, H. (2007). Position statement: Utility, limitations, and pitfalls in measuring testosterone: An Endocrine Society position statement. Journal of Clinical Endocrinology & Metabolism, 92(2), 405-413. https://pubmed.ncbi.nlm.nih.gov/24783351/
2- Citation 2 Goldman, A. L., Bhasin, S., Wu, F. C. W., Krishna, M., Matsumoto, A. M., & Jasuja, R. (2017). A reappraisal of testosterone's binding in circulation: Physiological and clinical implications. Endocrine Reviews, 38(4), 302-324. https://doi.org/10.1210/er.2017-00025
How it works
Easy testing — anytime, anywhere.
Step 01
Collect your saliva.
Step 02
Scan your test with the Eli app.
Step 03
Visualize your data.
Get personalized tips.
Doctor Hannah-Shmouni’s
medical perspective
“Testosterone shifts hour to hour. Frequent salivary testing captures these changes, offering a dynamic profile a single measurement can’t—and linking these changes to symptoms, mood, and performance.“
Fady Hannah-Shmouni, MD
Eli Health Medical Director, endocrinologist + geneticist at University of British Columbia.
