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Fadogia Agrestis
Bottom line
In our scoring, Fadogia Agrestis rates ineffective and the evidence does not back the core claim. Bottom line: we do not score brands for an ingredient this weak. This is our opinion, not medical advice; talk to your clinician before starting.
Fadogia agrestis is a supplement where the honest position is: we do not recommend casual use.
- Evidence
- Ineffective
- Category
- Men's Health
- Best form
- there is no evidence-based form or dose
- Effective dose
- No established safe or effective human dose
- Lab tested
- 5 of 6 products
- Category
- Men's Health
- Best form
- there is no evidence-based form or dose
- Effective dose
- No established safe or effective human dose
- Lab tested
- 5 of 6 products
Key takeaways
- →Zero human trials exist. Every testosterone and libido claim comes from a small cluster of rat studies from one research group.
- →Those same rat studies documented testicular, liver, and kidney toxicity at higher doses - and the toxic doses sit near or above the 600 mg most products sell once scaled to humans.
- →The market voted: Momentous discontinued its product, the podcast that popularized it moved on to tongkat ali, and some science-forward retailers refuse to carry it.
- →Our honest verdict: we do not recommend casual use. If testosterone support is the goal, tongkat ali has more evidence and a better safety profile.
What Is Fadogia Agrestis?
Fadogia agrestis is a supplement where the honest position is: we do not recommend casual use. It is a Nigerian shrub sold as a natural testosterone booster, and it went mainstream almost entirely because a popular podcast discussed it. The uncomfortable reality behind the marketing is twofold and hard to overstate: there is not a single published human trial, and the same rat studies used to sell it also documented testicular, liver, and kidney toxicity at higher doses. This is not a "the evidence is mixed" situation - it is a "the human evidence does not exist and the animal evidence includes real harm" situation.
Here is what is actually known. In rats, an aqueous extract raised testosterone in a dose-dependent way, apparently by stimulating luteinizing hormone (Yakubu 2005). That single rodent mechanism is the entire scientific basis for the "test booster" claim, and it has never been shown to work in a human being. On the harm side, a 28-day rat study found the same extract damaged testicular tissue - changes that were largely reversible at the lowest dose but not at higher ones (Yakubu 2008) - and a follow-up found liver and kidney cell damage with markers of oxidative stress (Yakubu 2009). Newer rodent work continues to report organ effects.
The dose math is the part that should give anyone pause. The animal toxicity shows up at doses that, once scaled to humans by body surface area, land near or just above the 600 mg that is the single most common serving sold - and well below the 1,200 to 1,500 mg "maximum potency" products on the shelf. To be fair and accurate: a simple milligram-per-kilogram conversion puts 600 mg below the lowest dose ever tested in rats, so we are not saying every capsule is a proven toxic dose. The real finding is bleaker in a different way: nobody has ever established a safe human dose, an upper limit, or a safe duration. Anyone taking it is self-experimenting.
The market has quietly voted, too. Momentous - the supplement brand most associated with the podcast that popularized fadogia - discontinued its product, citing insufficient research and quality standards. The podcast host has since deprioritized it in favor of tongkat ali. And at least one science-forward retailer refuses to stock it at all. We link products here because that is our policy and people buy them anyway, but the verdict is the point: for a healthy person, this is an experimental compound with a genuinely concerning animal-toxicity record and no human safety data. If testosterone support is the goal, tongkat ali has more evidence and a better safety profile.
Does It Work? The Evidence
How A-F grades workFadogia Agrestis earns an Ineffective rating: the evidence does not support its primary claimed purpose. We still grade the individual claims below, but we don't score brands for an ingredient that doesn't work.
Causes testicular damage at higher doses
Yakubu et al. 2008 (J Ethnopharmacol): 28-day dosing damaged testicular tissue (spermatic cells, seminiferous tubules), largely reversible at the lowest dose but not at higher ones
Causes liver and kidney toxicity
Yakubu et al. 2009 (Hum Exp Toxicol): membrane-level damage to liver and kidney cells with raised oxidative-stress markers; newer rodent work reports similar organ effects
Raises testosterone
Yakubu et al. 2005 and 2008 (rats): dose-dependent rise in serum testosterone, apparently via luteinizing hormone. No human trial has ever tested this - the evidence is entirely rodent
Improves libido and sexual function
Yakubu et al. 2005 (rats): increased mounting and mating behavior in male rats; no human data exists
Has an established safe human dose
No human trial has defined a safe dose, an upper limit, or a safe duration; the common 600 mg serving is not supported by human safety data, and 1,200-1,500 mg products push further past the animal toxicity signal
| Grade | Claimed Benefit | Key Studies | Our Verdict |
|---|---|---|---|
| B | Causes testicular damage at higher doses | Yakubu et al. 2008 (J Ethnopharmacol): 28-day dosing damaged testicular tissue (spermatic cells, seminiferous tubules), largely reversible at the lowest dose but not at higher ones | Supported |
| B | Causes liver and kidney toxicity | Yakubu et al. 2009 (Hum Exp Toxicol): membrane-level damage to liver and kidney cells with raised oxidative-stress markers; newer rodent work reports similar organ effects | Supported |
| D | Raises testosterone | Yakubu et al. 2005 and 2008 (rats): dose-dependent rise in serum testosterone, apparently via luteinizing hormone. No human trial has ever tested this - the evidence is entirely rodent | Not There Yet |
| D | Improves libido and sexual function | Yakubu et al. 2005 (rats): increased mounting and mating behavior in male rats; no human data exists | Not There Yet |
| F | Has an established safe human dose | No human trial has defined a safe dose, an upper limit, or a safe duration; the common 600 mg serving is not supported by human safety data, and 1,200-1,500 mg products push further past the animal toxicity signal | Not There Yet |
How to Choose: Forms, Doses & What Matters
Clinical dose: No established safe or effective human dose; products sell 600 mg (some 1,200-1,500 mg), none validated in humans
Best forms: there is no evidence-based form or dose, if used at all: pure 600 mg over the 1,200 mg+ megadoses, avoid entirely if you value a proven safety margin
We are not going to give a confident protocol for a compound with no human safety data, because doing so would imply a safety it has not earned. What experienced users do - and what the risk profile demands if you use it at all - is take a pure 600 mg product rather than a megadose, cycle it (commonly a few weeks on, then off) rather than taking it continuously, avoid combining it with other liver- or kidney-stressing substances, and get bloodwork before and during use. If your liver or kidney markers move, stop. Better still, take the market's hint and use tongkat ali instead.
Who Should Take Fadogia Agrestis?
Honestly, we cannot point to a group for whom the risk-to-evidence math works. There are no human trials showing fadogia does anything in people, and the animal record includes organ toxicity, so anyone using it is self-experimenting with a compound that has no established safe dose. If you are set on trying it despite that, the least-unreasonable approach is a pure 600 mg product (not the 1,200-1,500 mg megadoses), short cycles rather than continuous use, and baseline plus follow-up bloodwork for testosterone, liver enzymes, and kidney markers - the very fact that experienced users insist on monitoring their organ labs tells you what kind of supplement this is.
Who Should Avoid It?
Not for everyone
Side Effects & Safety
Product Scores
6 products scored on dosing accuracy, third-party testing, cost per effective dose, and label transparency.
We don't score brands for this ingredient because the clinical evidence does not support its effectiveness. A well-made pill of an ineffective ingredient is still ineffective.
Fadogia Agrestis 600mg (10:1)
NutricostWe don't score brands for this ingredient because the clinical evidence does not support its effectiveness. A well-made pill of an ineffective ingredient is still ineffective.
$24.95 for 120 servings
Fadogia Agrestis 600mg
Double Wood
We don't score brands for this ingredient because the clinical evidence does not support its effectiveness. A well-made pill of an ineffective ingredient is still ineffective.
$29.95 for 90 servings
Fadogia Agrestis 50:1 Extract Powder
Micro Ingredients
We don't score brands for this ingredient because the clinical evidence does not support its effectiveness. A well-made pill of an ineffective ingredient is still ineffective.
$25.95 for 188 servings
Fadogia 600mg + Tongkat Ali 400mg
NatureBell
We don't score brands for this ingredient because the clinical evidence does not support its effectiveness. A well-made pill of an ineffective ingredient is still ineffective.
$35.95 for 120 servings
Fadogia Agrestis 30:1 (1,200mg)
Toniiq
We don't score brands for this ingredient because the clinical evidence does not support its effectiveness. A well-made pill of an ineffective ingredient is still ineffective.
$29.97 for 120 servings
Fadogia 1,500mg + Tongkat Ali + BioPerine
Old School Labs
We don't score brands for this ingredient because the clinical evidence does not support its effectiveness. A well-made pill of an ineffective ingredient is still ineffective.
$53.99 for 40 servings
Frequently Asked Questions
Does fadogia agrestis actually boost testosterone?
In rats, yes - a rat study found it raised testosterone in a dose-dependent way by stimulating luteinizing hormone. In humans, there is no evidence at all, because there has never been a human trial. So the honest answer is that the testosterone claim rests entirely on rodent data and has never been demonstrated in a person. That is a thin and risky basis for taking a compound with a documented animal-toxicity record.
Is fadogia agrestis safe?
There is no human safety data, and the animal data is concerning. The same rat studies used to market it also found testicular damage (only partly reversible at higher doses) and liver and kidney toxicity with oxidative stress. The toxic doses in animals sit near or above the 600 mg most products sell once scaled to humans, and no one has ever established a safe dose, ceiling, or duration in people. This is why experienced users cycle it and monitor their organ bloodwork - and why we do not recommend casual use.
Why did Momentous stop selling fadogia?
Momentous - the supplement brand most associated with the podcast that popularized fadogia - discontinued its fadogia product, citing insufficient research and its quality and integrity standards. It is a notable signal: the seller closest to the trend pulled the product, the podcast host has since deprioritized fadogia in favor of tongkat ali, and some science-forward retailers refuse to stock it at all. When the sellers back away, that is worth paying attention to.
What should I use instead of fadogia for testosterone?
Tongkat ali is the better-evidenced choice - it has actual human trials behind it and a more reassuring safety profile, which is exactly why the podcast that popularized fadogia now points people toward it. Foundational basics matter more than any herb, though: adequate sleep, resistance training, managing body fat, and correcting a vitamin D or zinc deficiency if you have one. See our tongkat ali and testosterone-support guides for options with real human evidence.
Is the 1,200 mg or 1,500 mg 'max potency' fadogia better?
No - if anything it is worse. Higher doses push further past the animal toxicity signal, and there is no human evidence that more fadogia does anything beneficial. The 1,200 to 1,500 mg products are the riskiest tier on the shelf. If someone insists on using fadogia at all, a pure 600 mg product is the least-unreasonable option, not a megadose.
Do I need bloodwork if I take fadogia?
If you use it despite the concerns, yes - baseline and follow-up testing of testosterone, liver enzymes (ALT/AST), and kidney markers (creatinine) is what experienced users do, because the animal data flags liver, kidney, and testicular effects. Honestly, the fact that responsible use requires monitoring your organ labs is one of the clearest signs that this is an experimental compound rather than a routine supplement.
Related Reading
Sources
- Yakubu MT, Akanji MA, Oladiji AT. Aphrodisiac potentials of the aqueous extract of Fadogia agrestis (Schweinf. Ex Hiern) stem in male albino rats. Asian J Androl. 2005;7(4):399-404.
- Yakubu MT, Akanji MA, Oladiji AT. Effects of oral administration of aqueous extract of Fadogia agrestis (Schweinf. Ex Hiern) stem on some testicular function indices of male rats. J Ethnopharmacol. 2008;115(2):288-92.
- Yakubu MT, Oladiji AT, Akanji MA. Mode of cellular toxicity of aqueous extract of Fadogia agrestis (Schweinf. Ex Hiern) stem in male rat liver and kidney. Hum Exp Toxicol. 2009;28(8):469-78.
- Ogunro OB, et al. Fadogia agrestis (Schweinf. Ex Hiern) Stem Extract and reproductive/biochemical effects in a rat model. Reprod Sci. 2023. (Rodent study - no human data exists for fadogia.)
- Examine.com - Fadogia agrestis. Independent research summary noting the absence of human trials and animal-only, safety-caveated evidence.
Scores and tiers are our independent opinion, formed by applying a published rubric to label data, third-party certifications, and the research record. They are not statements of objective fact about a product and not a lab test. Where we report a brand-specific fact, it comes from a cited source or a public certification; where verification is missing, we say so rather than assume a result.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.