The Claim

Supplementation with Tongkat Ali reduces cortisol levels and increases free testosterone levels in stressed adults.

Source: This Plant Increased Testosterone 37% and Dropped Cortisol 16%

What the research says

Supports is higher

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

Supports
56score
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.

Cause and effect
1 study reviewed
In plain English

Taking Tongkat Ali supplements lowers cortisol and raises free testosterone in adults experiencing stress.

See the scientific wording

Supplementation with Tongkat Ali reduces cortisol levels and increases free testosterone levels in stressed adults.

Why this might work

Tongkat Ali contains compounds that bind to a protein that holds testosterone in the blood, freeing up more testosterone to act on tissues. These compounds also trigger an enzyme that makes more building blocks for testosterone. At the same time, they reduce the signal that tells the body to produce stress hormone, lowering cortisol levels.

Supported mechanismbased on 2 studies

What the research says

1 study
  1. Study: Effect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjects

    This study found that people who took Tongkat Ali supplements for a month had less of the stress hormone cortisol and more of the hormone testosterone, exactly as the claim says.

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.