Free testosterone: what the evidence supports and Tongkat Ali
Each entry’s own grades, side by side. A grade says how strong the evidence is for one outcome — it does not rank one entry over the other.
Outcome map
Free testosterone: what the evidence supports
2 graded interventions for free testosterone, ranked by strength of evidence.
Grade C2 graded outcomesrevised Jul 10, 2026
Assembled by the app from other entries in this library. It adds no evidence of its own — follow the links to the entries it draws on.
Compound or practice
Tongkat Ali
The testosterone-support herb with the least-bad evidence — modest free-T and stress signals, best in the stressed or older.
Grade C3 graded outcomesrevised Jul 10, 2026
A structured monograph in Prometheus's bundled library. Its grades are the monograph's own reading of the evidence, not a peer-reviewed review.
Graded in both
Outcomes are matched by name. Two entries can describe the same outcome in different words, so one listed further down may still be graded in the other.
No outcome has the same name in both entries. They may still overlap under different wording — read the two lists below.
Graded only in Free testosterone: what the evidence supports
- Boron Small effectEvidence grade C
- Tongkat Ali Small effectEvidence grade C
Graded only in Tongkat Ali
- Free testosterone Small effectEvidence grade C
- Stress / cortisol Small effectEvidence grade C
- Libido Small effectEvidence grade C
What each entry says about the other
- Free testosterone: what the evidence supports’s entry · Goes with: Grade C
Both columns are read from the entries as they stand in this library. A comparison is not advice to take either one, and it is no substitute for a clinician who knows the person.