Fadogia Agrestis: Benefits, Dosage, Best Forms & Safety

What Is Fadogia Agrestis?

Fadogia agrestis is a flowering shrub native to Nigeria and other parts of West Africa, where its stem has a history of traditional use as an aphrodisiac. It became widely known in Western bodybuilding and testosterone-support circles largely through online forums and influencer content rather than through clinical research.

It is now most often sold paired with tongkat ali in “testosterone stack” products; see our Tongkat Ali guide for how that ingredient’s evidence compares. The two are frequently marketed together even though they have very different research bases.

What the Evidence Actually Shows

• Testosterone increases in animal studies only. Small studies in male rats have reported increases in testosterone and related reproductive hormones (LH, FSH) after Fadogia agrestis extract. This animal research is the entire basis for its “testosterone booster” marketing.
• No published human clinical trials exist. As of 2026, there are no registered, published human clinical trials of Fadogia agrestis on testosterone, libido, or any other outcome. Every human-facing claim is extrapolated from rodent data or anecdotal reports, not measured directly in people.
• Traditional use as an aphrodisiac. It has a genuine history of traditional and folk use in West Africa, but traditional use is a different kind of evidence than a controlled trial, and it does not establish a specific safe or effective dose.

Dosage Guide

• Standard Dose: There is no clinically established human dose, because no human trials exist. Historical and traditional use is generally described in the 100-400 mg/day range; however, many current commercial capsules provide 600-1,600 mg per serving, several times higher than traditional use, with no human safety data at those higher doses.
• Upper Limit (UL): No UL exists, and none can be responsibly estimated without human trials.
• Timing: Marketed products typically suggest once-daily dosing, but this is a manufacturer convention rather than a research-based recommendation.
• Notes: Given the total absence of human dosing research, assuming that a higher dose is more effective or equally safe is not supported by any evidence; the commercial doses common today have not been tested at all, in any species, for safety.

Drug & Supplement Interactions

• Substances known to stress the liver (Medium, based on animal data only): The rodent studies that found testosterone increases also reported changes consistent with liver and kidney stress at higher doses. Until human data exists, combining Fadogia agrestis with other substances known to stress the liver, such as heavy alcohol use, high-dose acetaminophen, or anabolic steroids, is not advisable.
• Other hormone-active supplements, e.g., tongkat ali or DHEA (Medium): Because Fadogia agrestis is usually stacked with other hormone-active ingredients, and no such combination has been tested in humans, stacking multiplies unknown risk without any confirmed added benefit.
• Blood pressure or heart medication (Low, no data): No specific interaction has been studied. As with any unstudied supplement, people on chronic heart or blood pressure medication should discuss use with a doctor before starting.

Safety & Side Effects

Because there are no human clinical trials, there is no human safety database for Fadogia agrestis at any dose, let alone at the 600 to 1,600 mg doses common in today’s commercial products. This is meaningfully different from most other ingredients in this library, most of which have at least some human safety data to draw on.

The rat studies that reported testosterone increases also reported markers consistent with liver and kidney stress, including changes in liver and kidney enzyme activity and markers of oxidative cellular damage, at higher doses. Whether these effects occur in humans, and at what dose, is simply unknown. This combination, real hormone effects paired with real toxicity signals in the only controlled research available, is the central reason this guide treats Fadogia agrestis as a caution-first ingredient rather than a benefits-first one.

Bottom Line

Fadogia agrestis is a clear example of marketing outrunning evidence. Its testosterone claims come entirely from small rodent studies, the same studies that also flagged possible liver and kidney stress at higher doses, and no human clinical trial has tested it at any dose. Given that commercial products now use doses far above traditional use, this guide recommends treating Fadogia agrestis as an unproven ingredient with real, unresolved safety questions rather than a proven testosterone booster.

Frequently Asked Questions

Q: Does Fadogia agrestis actually raise testosterone in humans?
A: No human study has tested this. The testosterone-raising effect is documented only in small rodent studies; whether or to what extent it applies to humans is unknown.

Q: Is Fadogia agrestis safe?
A: This can’t be answered with confidence, because there are no human clinical trials. The animal research that found hormone increases also found signs of liver and kidney stress at higher doses, which is a real reason for caution, especially at the high doses common in commercial products today.

Q: Why is Fadogia agrestis often sold with tongkat ali?
A: The two are commonly marketed together as a “testosterone stack” because both are positioned as natural test boosters, but they have very different evidence bases. See our Tongkat Ali guide for a comparison of how much stronger tongkat ali’s human evidence is by comparison.

Q: How much Fadogia agrestis is safe to take?
A: There is no research-established safe human dose. Traditional use is generally in the 100-400 mg/day range; many commercial products use 600-1,600 mg per serving, well outside that traditional range and entirely outside anything tested in a controlled study.

Sources

• Summarized animal-research literature on Fadogia agrestis (rodent studies on testosterone, LH, FSH, and liver/kidney enzyme markers), as reviewed in available secondary supplement-research literature.
• NIH National Center for Complementary and Integrative Health (NCCIH): general framework for evaluating under-researched botanical supplements.