The Claim
Daily supplementation with 200 mg of a standardized hot-water extract of Eurycoma longifolia (Tongkat Ali) for four weeks reduces salivary cortisol exposure by 16% and increases free testosterone levels by 37% in moderately stressed adults, resulting in a 36% improvement in the cortisol-to-testosterone ratio.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Taking 200 mg of Tongkat Ali extract daily for four weeks lowers salivary cortisol by 16% and raises free testosterone by 37% in moderately stressed adults, improving the cortisol-to-testosterone ratio by 36%.
See the scientific wording
Daily supplementation with 200 mg of a standardized hot-water extract of Eurycoma longifolia (Tongkat Ali) for four weeks significantly reduces salivary cortisol exposure by 16% and increases free testosterone levels by 37% in moderately stressed adults, improving the cortisol-to-testosterone ratio by 36%, which may help mitigate the hormonal imbalance associated with chronic stress from lifestyle factors such as dieting, sleep deprivation, or intense exercise.
Bioactive compounds in Tongkat Ali bind to a protein that holds testosterone tightly, freeing up more testosterone to act in the body. At the same time, these compounds turn on an enzyme that makes more building blocks for testosterone. Higher testosterone levels and lower stress hormone levels happen together because the body's stress system slows down when testosterone rises, reducing the production of cortisol.
What the research says
1 studyThis study found that taking a specific Tongkat Ali supplement every day for four weeks lowered the stress hormone cortisol and raised the sex hormone testosterone in people feeling moderately stressed, which is exactly what the claim says.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.