We read the trials, score formulations against what the literature actually supports, and publish the rubric we use. No marketing claims, no testimonials.
See the 2026 formulation ranking
Serum testosterone declined across successive birth cohorts, independent of age and BMI.
One replaces the hormone and suppresses the system that makes it. The other supports that system.
Total, free, SHBG and LH each answer a different question. What to ask for and when to test.
Moderate evidence. 200 to 400mg standardized to eurycomanone.
Good evidence for cortisol. 240 to 600mg standardized to withanolides.
Limited evidence. 250mg twice daily of purified extract.
Moderate evidence on free testosterone. 6 to 10mg daily.
Corrects deficiency. 15 to 30mg. Upper limit 40mg per day.
Form determines absorption. 200 to 400mg elemental.
Correction effect. 1,000 to 4,000 IU daily as D3.
Mixed evidence. Positive initial trial, failed replications.
Only three symptoms held up as independently associated in the largest study of the question.
Restricting healthy young men to five hours a night reduced daytime testosterone by 10 to 15%.
Proprietary blends, herb-equivalent dosing and unstandardized extracts are all legal.
