Fadogia Agrestis and Your Liver and Kidneys: Is It Safe?

Fadogia agrestis went from an obscure West African shrub to a best-selling "testosterone support" ingredient in just a few years, largely thanks to podcasts and social media. The marketing is confident; the science is thin. Our editorial team examined what is actually known about how this herb affects the liver and kidneys — and why the honest answer is "we don't know enough."

What Fadogia agrestis is

Fadogia agrestis is a small shrub in the coffee family (Rubiaceae) that grows in parts of Nigeria and neighboring countries. In traditional medicine the stem has been used as an aphrodisiac and for a range of other complaints, typically prepared as a water decoction.

Its jump into Western sports supplements came from a cluster of animal studies published mainly by one Nigerian research group in the mid-2000s. Those studies gave aqueous stem extract to male rats and reported increases in sexual behavior and blood testosterone. Marketers took those headlines and ran with them.

The active compounds responsible for any effect are still not well characterized. Researchers have described alkaloids, saponins, flavonoids, and other phytochemicals in the extract, but there is no standardized marker compound that would let a consumer know what a capsule actually delivers.

That lack of standardization is the first problem: one product's "600 mg Fadogia" may not resemble another's in composition or potency.

Where the safety signal comes from

The same rat studies that sparked interest also measured markers of organ function. In those experiments, repeated administration of the extract was associated with changes in several enzymes and biochemical indices in the liver, kidneys, and testes. The authors interpreted some of these as possible signs of altered organ function or tissue stress, particularly at higher doses and over longer exposure.

A later paper from the same group examining testicular function reported changes in testicular biochemistry, raising questions about whether the extract could be harmful to the very organ users hope to support. Some online commentators now recommend "cycling" Fadogia precisely because of this uncertainty — but cycling is a workaround for missing data, not a proven safety strategy.

It is important to be fair: rat findings do not automatically translate to people, and marker changes in animals do not prove clinical damage. But they are the only toxicology data available, and they point in a direction that deserves caution rather than enthusiasm.

Why herbal products and the liver are a sensitive pairing

Herbal and dietary supplements are a growing cause of drug-induced liver injury in the United States. Data from the Drug-Induced Liver Injury Network (DILIN), funded by the NIH, show that the share of liver injury cases attributed to supplements rose over the last two decades, with bodybuilding and weight-loss products prominently represented.

Several mechanisms can be at play. A plant can contain compounds that are directly toxic to liver cells, products can be contaminated or adulterated with undeclared drugs, and multi-ingredient "stacks" make it difficult to identify which component caused harm. Fadogia is very often sold in such stacks alongside tongkat ali, zinc, and other ingredients.

Supplement-related liver injury may show up as fatigue, nausea, loss of appetite, dark urine, itching, or yellowing of the skin and eyes. Some cases are mild and resolve after stopping the product; others require hospitalization.

Because the FDA does not review supplements for safety before they reach the market under DSHEA, the burden of proof effectively shifts to the consumer.

Kidney considerations for athletes

Kidney health is a less discussed but equally relevant concern. Athletes already place unusual demands on their kidneys: high protein intake, dehydration during training, frequent use of over-the-counter pain relievers such as ibuprofen, and sometimes creatine use, which can raise blood creatinine values and complicate lab interpretation.

Adding an herbal extract with documented renal marker changes in animals to that mix is not ideal. Even if the herb is ultimately shown to be harmless, it introduces one more variable when interpreting lab work.

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People with known kidney disease, high blood pressure, diabetes, or a history of kidney stones should be especially careful with any poorly studied botanical. The kidneys clear many plant compounds, and reduced function can lead to accumulation.

If you choose to use Fadogia despite the uncertainty, sensible precautions include:

• Getting baseline blood work (liver enzymes ALT, AST, bilirubin; creatinine and eGFR) before starting.
• Avoiding combination with alcohol, oral steroids, high-dose acetaminophen, or other hepatotoxic substances.
• Choosing single-ingredient products with third-party testing so any reaction can be traced.
• Stopping immediately at any sign of liver or kidney trouble and seeing a doctor.
• Repeating lab tests after several weeks of use.

Doping, labeling, and quality concerns

Fadogia agrestis is not on the WADA Prohibited List as a named substance. However, tested athletes face a separate risk: supplements marketed for testosterone support are a known category for contamination with undeclared anabolic agents. USADA's Supplement 411 program repeatedly warns that "testosterone booster" products carry a higher risk.

Label accuracy is another unknown. With no reference standard, independent laboratories cannot easily verify what proportion of a product is genuine Fadogia stem extract versus filler or another plant.

Doses on labels — often 425 to 600 mg per day — are not based on human clinical trials. They are extrapolations or simply marketing conventions. This is fundamentally different from ingredients like creatine, where dose ranges come from hundreds of controlled studies.

For athletes subject to testing, choosing products certified by recognized third-party programs remains the most practical way to reduce risk, though it cannot eliminate it entirely.

Editorial Team Conclusions

There are no published randomized human trials establishing either the effectiveness or the safety of Fadogia agrestis. Everything known comes from rodent studies, and those studies themselves raised flags about liver, kidney, and testicular markers.

That does not prove the herb is dangerous for people, but it means users are effectively running an uncontrolled experiment on themselves. The burden should be on the product to demonstrate safety, not on the consumer to discover harm.

If your goal is healthy testosterone levels, the strongest evidence still supports sleep, adequate energy intake, resistance training, body fat management, and correcting genuine deficiencies — not unproven botanicals.

Related reading you may find useful: our guide to liver enzymes for athletes, our review of tongkat ali research, and our article on how to interpret creatinine results.

References

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2. Yakubu MT, Akanji MA, Oladiji AT. Effects of oral administration of aqueous extract of Fadogia agrestis stem on some testicular function indices of male rats. J Ethnopharmacol. 2008;115(2):288–292.
3. Navarro VJ, Khan I, Björnsson E, Seeff LB, Serrano J, Hoofnagle JH. Liver injury from herbal and dietary supplements. Hepatology. 2017;65(1):363–373.
4. Gabardi S, Munz K, Ulbricht C. A review of dietary supplement-induced renal dysfunction. Clin J Am Soc Nephrol. 2007;2(4):757–765.
5. LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. Bethesda (MD): National Institute of Diabetes and Digestive and Kidney Diseases; 2012–.
6. Smith SJ, Lopresti AL, Teo SYM, Fairchild TJ. Examining the effects of herbs on testosterone concentrations in men: a systematic review. Adv Nutr. 2021;12(3):744–765.
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