Comparison
Tongkat Ali vs. Fadogia Agrestis
Tongkat Ali or Fadogia agrestis – which testosterone booster has human data?
The short answer
The difference lies one step before any effect: Tongkat Ali has been studied in humans, Fadogia agrestis not once, so there is no head-to-head comparison either. For Tongkat Ali, a meta-analysis of 5 randomized trials with 232 men finds a significant rise in testosterone that comes almost entirely from the group with low baseline levels; in healthy men it is not significant. Fadogia rests on a 5-day rat study from a single laboratory, which with longer administration found markers shifting towards testicular damage and signs of damaged cell membranes in liver and kidney. Neither is authorised as a food supplement in the EU. Low testosterone is a medical diagnosis, and its assessment belongs in a doctor's hands.
The numbers side by side
| Axis | Tongkat Ali | Fadogia Agrestis | Difference |
|---|---|---|---|
| Human evidenceHow much and how good the data in humans are | 6 | 0 | Tongkat Ali better studied |
| MechanismHow well the chain of action is understood | 3 | 2 | Tongkat Ali better studied |
| Safety dataHow well safety has been studied – not how safe it is | 4 | 1 | Tongkat Ali better studied |
| Hype gap10 means: the advertising stays level with the data | 3 | 1 | Tongkat Ali closer to the data |
| Track record of useHow much documented use in humans exists – does not measure whether it works | 6 | 4 | Tongkat Ali in use longer |
| Rating | Supported, with caveats · Not studied in humans | ||
“Track record of use” measures how long and how widely something has been used in humans – not whether it works. The BK-Score is a subjective assessment by Biohacking Kompakt based on published scoring rules (German). It is not a scientific rating, not the consensus of a professional society and not a medical recommendation.
Why these numbers
Tongkat Ali
Evidence 6 and mechanism 3: the 2022 meta-analysis pools 5 randomized trials with 232 men and finds a significant increase, but heterogeneity is 87 percent, the effect is not significant in healthy men, and the advertised SHBG pathway remained unchanged in 32 young men, as did LH and FSH, while aromatase inhibition has only been shown in Leydig cells from rat testes. Safety 4: only short-term data over 2 to 12 weeks are available, plus a liver case from 2024 and the genotoxicity signal on which the European authority based its rejection in 2021. Hype 3: marketing cites 37 percent from a manufacturer-funded saliva study in 63 participants of both sexes and a before-and-after study in 76 men without a placebo group, while the largest study, in 109 healthy men, shows nothing. Application 6: used for centuries in Southeast Asia and sold worldwide, but without authorisation in the EU; the direction remains neutral because the data speak for an effect at low baseline levels and against one in healthy men.
Fadogia Agrestis
Evidence 0 and mechanism 2: there is no human study, a PubMed search yields 10 hits including 3 rat studies from a single laboratory, and the advertised LH pathway was not even measured in the 2005 rat study. Safety 1: nothing has been systematically studied in humans; what exists are rats in which testicular markers shifted towards damage after 28 days and, in the 2009 follow-up study, signs of damaged cell membranes in liver and kidney appeared. Hype 1: it is sold as a testosterone booster on the basis of a 5-day rat experiment, while 5 of 17 products tested did not even contain the plant compound in detectable amounts. Application 4: following a high-reach recommendation, a broad user base emerged within months without any regulatory framework, since in the EU not even an authorisation application has been filed; the direction remains neutral because there are no human data pointing in either direction.
Frequently asked questions
Does Tongkat Ali work better than Fadogia agrestis?
In humans the two cannot be compared, because there is no human study on Fadogia agrestis. For Tongkat Ali there is a measurable effect in men with low baseline testosterone: in the cleanest study with 105 men, levels rose over 12 weeks from around 200 to 225 nanograms per decilitre, while the normal range starts at about 300. For Fadogia, the entire hormone claim rests on rats given a stem extract for 5 days.
How safe are Tongkat Ali and Fadogia agrestis?
For Tongkat Ali, safety data cover 2 to 12 weeks. Alongside that are a liver case from 2024, a case report of atrial flutter, an interaction with the beta blocker propranolol and a genotoxicity signal on which the European food safety authority based its rejection in 2021. For Fadogia there are no human safety data at all. In rats, testicular markers shifted towards damage after 28 days, and a follow-up study found signs of damaged cell membranes in liver and kidney.
Are Tongkat Ali and Fadogia agrestis legal in the EU?
Neither is permitted as a food supplement. Tongkat root extract counts as a novel food; the manufacturer applied for authorisation, and in 2021 the European food safety authority stated that its safety had not been established. For Fadogia stem extract, not even an application has been filed, so no official safety assessment exists. The fact that both are still on offer does not change the legal position.
Do Tongkat Ali and Fadogia products contain what the label says?
Not reliably, in either case. A 2018 DNA test found the correct plant unambiguously in only 37 percent of Tongkat products, and in Malaysia in 2004, 36 of 100 products exceeded the mercury limit. Of 17 Fadogia products analysed, 5 contained no detectable plant compounds of the species. For Tongkat Ali there is the added issue that 7 of 9 human studies reviewed used the same company extract, so no conclusions can be drawn about arbitrary commercial products.
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Information only, not medical advice and not a usage or dosage recommendation. Prescription-only and unapproved substances belong in a doctor's hands.