Fadogia agrestis on a cut: does it help?
Fadogia agrestis has become a fashionable add-on for men trying to protect testosterone while dieting down. Our editorial team looked at where the hype comes from, what the research actually covers and what is known to help during a cut.
What Fadogia agrestis is
Fadogia agrestis is a shrub native to parts of West and Central Africa, including Nigeria. Its stem has a history of use in local traditional medicine, reportedly for sexual problems and general vitality. Until recently, few people outside the region had heard of it.
That changed in the early 2020s, when the plant was mentioned on popular health podcasts as a possible way to increase testosterone by stimulating luteinising hormone. Within months, Fadogia capsules appeared in online shops and "natural test booster" formulas, often paired with Tongkat ali.
Supplements typically contain a dried stem extract, sometimes with a stated extract ratio but rarely with standardisation to any defined active compound. The plant contains saponins, alkaloids and flavonoids, but which of these, if any, accounts for the effects reported in animals is unknown.
Because the herb has so little history of regulated use in Europe, its legal status as a food ingredient in the UK and EU is not straightforward. Ingredients without a significant history of consumption before 1997 may need novel food authorisation, so consumers should not assume that availability online means a product has been assessed.
Where the testosterone claim comes from
Virtually all of the evidence comes from a small group of studies in male rats conducted by Yakubu and colleagues in Nigeria. In one, published in the Asian Journal of Andrology, an aqueous stem extract increased mating behaviour and serum testosterone in rats compared with controls.
A follow-up study by the same group looked at testicular function indices and reported changes suggesting the extract may also stress testicular tissue. Some measures pointed toward potential toxicity at the doses studied, raising questions about safety rather than simply confirming benefit.
There are, as far as our editorial team can determine, no published randomised controlled trials of Fadogia agrestis in humans measuring testosterone, body composition or performance. Doses used in rats cannot simply be scaled up to people, and rodent reproductive physiology differs from ours in important ways.
In other words, the leap from "raised testosterone in rats" to "will help you hold muscle on a cut" is a very long one, and it has not been tested.
Why testosterone falls during a cut
The reason people look for a booster during a diet is real. Prolonged energy deficit, especially when combined with low body fat and high training volume, suppresses the reproductive axis. Rossow and colleagues followed a natural bodybuilder through contest preparation and documented a large drop in testosterone as he approached competition, which recovered after he resumed normal eating.
A review by Fagerberg on low energy availability in male bodybuilders described similar patterns across studies: falls in testosterone and other hormones, reduced libido, low mood and impaired recovery as body fat and energy availability decline.
This suppression is an adaptive response to perceived scarcity, not a disease to be fixed with a herb. Its root causes are the size and duration of the deficit, the leanness reached and the training load.
Evidence-based recommendations for natural bodybuilding preparation, set out by Helms, Aragon and Fitschen, focus on modest rates of weight loss, high protein intake, sufficient dietary fat and planned diet breaks rather than on supplements designed to raise hormones.
Safety concerns
With no human safety data, the risks of Fadogia supplements are genuinely unknown. The animal findings that hinted at testicular stress are a particular reason for caution, especially for anyone who cares about future fertility.
| Question | Current answer |
|---|---|
| Does it raise testosterone in humans? | Unknown; no trials |
| Does it preserve muscle in a deficit? | Not studied |
| Is it safe for long-term use? | Unknown; animal data raise concerns |
| Is it permitted under anti-doping rules? | Not specifically listed, but contamination risk is real |
| Is product quality reliable? | Standardisation is generally lacking |
Herbal products sold as testosterone boosters are a high-risk category for adulteration with undeclared anabolic agents. Athletes in tested sport should be especially careful, as strict liability means they are responsible for anything found in their sample.
Men who notice testicular pain, swelling, reduced libido or changes in mood while using any such product should stop and seek medical advice.
What actually helps on a cut
If your goal is to keep as much muscle and as much hormonal health as possible while losing fat, the following measures have far better support than any herbal booster.
- Aim for a moderate rate of weight loss rather than a crash diet.
- Keep protein intake high and spread across meals.
- Maintain heavy resistance training to signal that muscle is still needed.
- Avoid cutting dietary fat to extremely low levels for long periods.
- Prioritise sleep, which strongly influences testosterone.
- Plan a structured return to maintenance calories after the diet.
If symptoms such as very low libido, poor mood or loss of morning erections persist after returning to normal eating, ask your GP about blood tests. Persistently low testosterone can have medical causes that deserve investigation.
Our editorial team does not recommend using unproven herbs or any hormonal agent to counteract dieting-related suppression. The safest "booster" is ending the deficit at the right time.
Editorial conclusions
Fadogia agrestis became popular almost overnight on the strength of a few rat studies and podcast enthusiasm. There are no human trials showing it raises testosterone or helps preserve muscle during a diet.
Animal data also hint at potential testicular toxicity, and product quality and regulatory status are uncertain.
The fall in testosterone during a cut is a predictable response to energy deficit and is best managed through diet design, training and recovery.
You may also find our pieces on Tongkat ali, testosterone changes during contest preparation and safe diet breaks helpful.
References
- 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 stem on some testicular function indices of male rats. J Ethnopharmacol. 2008;115(2):288–292.
- Rossow LM, Fukuda DH, Fahs CA, Loenneke JP, Stout JR. Natural bodybuilding competition preparation and recovery: a 12-month case study. Int J Sports Physiol Perform. 2013;8(5):582–592.
- Fagerberg P. Negative consequences of low energy availability in natural male bodybuilding: a review. Int J Sport Nutr Exerc Metab. 2018;28(4):385–402.
- Helms ER, Aragon AA, Fitschen PJ. Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation. J Int Soc Sports Nutr. 2014;11:20.
