Tongkat Ali Side Effects: Who Should Avoid It
Last updated: 2026-09-28
Quick answer
In human studies using 200 to 400 mg a day of standardised Tongkat Ali extract, side effects were uncommon and mild, such as restlessness or trouble sleeping when taken late in the day. People with heart, kidney or liver conditions, hormone-sensitive conditions, or who take regular medication should speak to a doctor first.
Side effects reported in studies
Most clinical trials on standardised water extract reported no serious side effects over 4 to 12 weeks. Occasional mild effects included restlessness, warmth, or difficulty sleeping. Taking it in the morning helps avoid sleep issues.
Who should avoid it or ask a doctor first
- Men on blood pressure, diabetes or blood-thinning medication.
- Anyone with heart, kidney or liver disease.
- Men with hormone-sensitive conditions, such as prostate cancer.
- Women who are pregnant or breastfeeding, and children.
The bigger risk: fake and adulterated products
KKM and HSA regularly warn about unregistered 'herbal' men's products that contain hidden prescription drugs. These cause far more harm than Tongkat Ali itself. Only buy products with a KKM registration number starting with MAL, which you can check on the NPRA website. Nuviton is registered as MAL24066122T.
Safe daily use
Follow the dose on the label, take it in the morning with water, and give it 8 to 12 weeks before judging results. Stop and see a doctor if you feel unwell.
Sources
- Systematic reviews and meta-analyses on Eurycoma longifolia (Tongkat Ali) in men, PubMed.
- Talbott SM et al. (2013). Effect of Tongkat Ali on stress hormones and psychological mood state. Journal of the International Society of Sports Nutrition.
- NPRA Malaysia: Product registration search (QUEST3+)
- HSA Singapore: Health products found to contain potent ingredients