Also known as: Eurycoma longifolia, longjack, Physta, tongkat
Latest evidence update: 2024-06-01
Strongest in Consistency (95). Held back by Recency (16).
Mostly meta-analyses and well-designed RCTs.
Some independent replication, statistical precision uneven.
Small combined sample; treat as preliminary.
Studies agree on direction of effect.
Mostly pre-2020 research; updates may be needed.
No quantified outcomes yet. Once we have studies with measurable endpoints, you will see per-outcome magnitude here.
Areas where research points to a consistent direction of effect. The strength of evidence is graded; the size of the effect is not quantified.
Recommended: 200 to 400 mg of a standardized water extract (such as Physta) daily. Testosterone and stress effects build over 2 to 12 weeks.
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