The Claim

In 76 men with late-onset hypogonadism, daily ingestion of 200 mg of a standardized water-soluble extract of Eurycoma longifolia for one month was associated with an increase in serum testosterone levels, with 90.8% of participants achieving normal values compared to 35.5% at baseline, and a reduction in symptom severity as measured by the Ageing Males' Symptoms scale, with 71.7% reporting no complaints compared to 10.5% at baseline.

Source: Standardised water‐soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late‐onset hypogonadism?

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
33score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Quantitative
1 study reviewed
In plain English

In 76 men with low testosterone due to aging, taking 200 mg of Eurycoma longifolia extract daily for one month resulted in 90.8% achieving normal testosterone levels, up from 35.5% before treatment, and 71.7% reporting no symptoms, up from 10.5% before treatment.

See the scientific wording

In 76 men with late-onset hypogonadism, daily ingestion of 200 mg of a standardized water-soluble extract of Eurycoma longifolia for one month was associated with an increase in serum testosterone levels from 35.5% to 90.8% of participants achieving normal values, alongside a reduction in symptom severity as measured by the Ageing Males' Symptoms scale, from 10.5% to 71.7% reporting no complaints.

Why this might work

The extract activates the pituitary gland to release more luteinizing hormone, which signals the testes to produce more testosterone, raising blood levels and reducing symptoms caused by low testosterone.

Suggested mechanismbased on 1 study

What the research says

1 study

  1. Study: Standardised water‐soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late‐onset hypogonadism?

    In a small group of older men with low testosterone and symptoms, taking a specific herbal supplement daily for a month was linked to many more men having normal testosterone levels and feeling better. The study didn't prove the supplement caused it, but it did show a strong link.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.