Eurycoma longifolia · Long Jack
Tongkat Ali (Eurycoma longifolia, also called Longjack or Pasak Bumi) is a Southeast Asian medicinal plant traditionally used for male vitality, libido, and energy. Modern clinical research consistently shows Tongkat Ali increases free and total testosterone in subfertile men and reduces SHBG in older men - distinguishing it from many 'natural T-booster' supplements that lack supporting evidence.
Starting dose. 200-400mg — Standardized extract
Morning preferred (mild stimulant).
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
Tongkat Ali's mechanism centers on hypothalamic-pituitary-gonadal axis modulation:
Tongkat Ali reduces sex hormone-binding globulin, increasing free testosterone available for tissue effects. Particularly relevant in older men with elevated SHBG.
Eurycomanone may directly support Leydig cell testosterone production.
Mild aromatase inhibition reported in some studies - reduces estradiol from testosterone aromatization.
Multiple studies show reduced cortisol under stress, supporting the 'energy/recovery' use case.
Eurycomanone has cytotoxic activity at high concentrations - mechanism for reported anti-cancer activity in some preclinical studies.
Weeks 1-2: subtle effects.
Weeks 4-8: peak T effect.
Weeks 8-12: stable elevation.
Each reference below was re-fetched from its PubMed record, and the quoted sentence was confirmed to appear in that abstract and to support the claim it sits under. Follow any of them to read the source.
Exact-molecule evidence boundary: the live abstract reports the quoted finding for Tongkat Ali; no broader inference is made.
In South-East Asia, Eurycoma longifolia Jack, also known as 'Malaysian ginseng' or Tongkat ali, is used to combat stress and disease and to improve physical strength.
Evidence scope. Exact molecule wording appears in the quoted live sentence. Only the population/model, formulation, route, and outcome expressly stated there are supported.
Claims we could not support
No abstract we checked supports these for this molecule at this route. That is not the same as saying they are false — it marks where the evidence is missing.
Dose/route: 200-400mg standardized extract; Oral capsule; 1-2x daily. No selected live abstract sentence verified this complete regimen.
Mechanism as written in source JSON. No selected live abstract sentence verified the complete mechanism at the card formulation/route and relevant population/model.
Primary safety claim as written in source JSON. No selected live abstract sentence verified the complete safety claim for this exact formulation and route.
Eurycomanone variable; multi-component extract
Hours plasma; cumulative T effects over weeks
Oral moderate
Daily dosing for sustained effects
Hepatic
Storage. Capsule. Cool dry location.
Dietary supplement (US, DSHEA). Traditional medicine in Southeast Asia.
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