Last updated: May 3, 2026 · By Eternal Elixir Science Team
Fadogia agrestis exploded onto the Australian biohacker scene after Andrew Huberman discussed it as part of his protocol for natural testosterone support. But once the bottle lands on your kitchen bench, the real fadogia agrestis dosage question is brutally practical: how much do you actually take, when do you take it, and for how long?
The answer is more nuanced than the “600 mg per day” figure passed around on Reddit. Fadogia has only ever been studied in rats, the human dosing norm has been extrapolated from those rodent doses, and the safe upper limit hasn’t been established. This guide walks through what the research actually says, the dosing range most Australian users settle on, how to cycle it, and when to stack it with Tongkat Ali for the synergy that pushes results.
What the Research Actually Says About Fadogia Dosing
Fadogia agrestis is a flowering shrub native to West Africa, traditionally used as an aphrodisiac. The supplement world’s entire human dosing protocol traces back to a single 2005 rodent study by Yakubu and colleagues at the University of Ilorin in Nigeria. According to PubMed, the team gave male rats aqueous Fadogia stem extract at 18 mg/kg, 50 mg/kg, and 100 mg/kg body weight daily for five days. All three doses raised serum testosterone in a dose-dependent manner and improved sexual behaviour parameters (Yakubu et al., 2005; DOI).
To translate the most studied rat dose (100 mg/kg) to a human equivalent, researchers typically apply the FDA body-surface-area conversion factor, which divides rodent doses by roughly 6.2. For an 80 kg adult, that lands somewhere between 1,000 mg and 1,300 mg per day — substantially higher than the 600 mg figure most podcasters cite. The lower-end rat dose (18 mg/kg), translated the same way, lands closer to 230–290 mg for an 80 kg human.
That gives a defensible range, not a single magic number. Australian users generally start in the lower band and work upward, because no human pharmacokinetic data exists to confirm absorption, half-life, or tissue accumulation in people.
Recommended Fadogia Agrestis Dosage
For most healthy adult men, the working dosage range that has emerged from biohacker self-reports and clinician commentary is:
- Starter dose (week 1–2): 300–400 mg per day, taken once in the morning with food.
- Standard dose (week 3 onward): 600 mg per day, split as 300 mg morning and 300 mg early afternoon.
- Upper-end dose (experienced users): 900–1,000 mg per day, split across two or three doses with meals.
Women, men under 25, and anyone with a history of liver concerns should not be using Fadogia at all — the data simply isn’t there. Liver enzyme elevation has been observed in some rodent studies at the highest doses, which is the main reason responsible users keep cycles short and stay on the lower end of the range.
When to Take Fadogia for Best Results
Timing matters more for tolerability than for efficacy. Fadogia is mildly stimulating for some users and can interfere with sleep if taken too late in the day. The pattern most Australians settle on:
- Morning dose with breakfast. Saponins absorb better with a fat-containing meal, and the morning slot reduces sleep disruption risk.
- Optional second dose at lunch. If splitting 600 mg, the second half should be taken before 2 pm. Avoid post-dinner dosing.
- Stack with Tongkat Ali. Most Australian formulations pair the two because Tongkat Ali addresses the cortisol and SHBG side of natural testosterone optimisation, while Fadogia is theorised to act on Leydig cells directly. The Eternal Elixir Tongkat Ali + Fadogia 2010 mg formula delivers both in a single capsule, which simplifies timing entirely.
How Long to Cycle Fadogia Agrestis
Cycling is non-negotiable with Fadogia. Because human safety data is so limited and rodent studies have flagged liver and testicular tissue changes at high doses or extended duration, every responsible protocol builds in breaks.
The two cycle structures most used in Australia:
- 5 days on, 2 days off (continuous): Take Fadogia Monday to Friday, off on weekends. Suitable for users on the lower end of the dose range (300–600 mg).
- 8 weeks on, 4 weeks off (block cycling): Run the full daily dose for eight weeks, then stop entirely for four weeks. This is the format most cited by Huberman and the format that aligns best with the 8-week duration most Tongkat Ali studies use.
Tongkat Ali, by contrast, has a much stronger human safety record. A six-month randomised, double-blind trial of 200 mg per day in men with androgen deficiency showed significant improvements in erectile function and total testosterone with no concerning safety signals (Leitão et al., 2020; DOI). An earlier 2011 Malaysian study of Tongkat Ali at 200 mg per day for one month found that 90.8% of men with late-onset hypogonadism reached normal testosterone levels by the end of treatment (Tambi et al., 2011; DOI). This is why most Australian biohackers run Tongkat Ali continuously and only cycle the Fadogia component.
What Results to Expect (and the Realistic Timeline)
Fadogia is not a pre-workout. You will feel nothing acute in the first week. The effects most users report come from the cumulative testosterone and libido shift, and they show up across roughly the following timeline:
- Week 1–2: Mild improvements in morning energy and motivation. No measurable hormonal change yet.
- Week 3–4: Libido shift becomes noticeable. Workout drive and recovery improve subjectively. This is the most common “something is happening” window.
- Week 6–8: Peak effects on libido, erectile quality, and gym output. Body composition changes (if training and diet support it) start to show.
- Week 9 onward (during the 4-week off period): Effects partially persist; the off period is for safety, not because the supplement “washes out” instantly.
Anyone expecting day-three changes is going to quit before the supplement has a chance to work. The biggest mistake Australian users make is under-dosing for two weeks, feeling nothing, and binning the bottle. This is the same pattern we describe in our natural testosterone optimisation protocol for men over 35.
Side Effects, Risks and Who Should Avoid Fadogia
Reported side effects in self-reporting Australian users (no formal human safety study exists yet) include mild jitters, light-headedness on an empty stomach, occasional headaches, and increased aggression at upper-end doses. The serious concern is the rodent finding of testicular toxicity at 100 mg/kg over extended periods, which is part of why cycling is critical.
Do not take Fadogia agrestis if you are:
- Under 25 (your endocrine system is still calibrating)
- Female (no female safety data; not formulated for women)
- On testosterone replacement therapy or any HPG-axis medication
- Living with liver disease, fatty liver, or elevated ALT/AST
- Using SSRIs, MAOIs, or any medication metabolised heavily by CYP3A4
If you have any of the above conditions, the Tongkat Ali side of the formula has a much cleaner safety profile and may be the better starting point. We cover the full picture in our best Tongkat Ali supplements in Australia guide.
Choosing a Quality Fadogia Supplement in Australia
The Australian Fadogia market is full of underdosed and mis-labelled products. The non-negotiables when choosing:
- Verified extract ratio. A 10:1 stem extract is the most evidence-aligned form. Whole-powder Fadogia at the same milligram count is significantly weaker.
- Third-party testing. Heavy metal and microbial testing is essential for any imported African botanical.
- Capsule count and per-dose pricing. Most competitor brands sell only 30 to 60-count bottles. Every Eternal Elixir bottle contains 90 capsules, which is 50–200% more product per bottle and substantially better value per serving.
- Synergistic stack design. The Tongkat Ali + Fadogia combo at 2010 mg per serving lets you cover both pathways without juggling two bottles.
Frequently Asked Questions
What is the recommended Fadogia agrestis dosage per day?
Most Australian users settle on 600 mg per day, split as two 300 mg doses with meals. New users should start at 300–400 mg for the first two weeks before scaling up.
What dose did Andrew Huberman discuss for Fadogia?
Huberman has cited a personal protocol of 600 mg per day, cycled in eight-week blocks with four weeks off. He has been clear that this dose is extrapolated from rodent research and not from human trials.
Can you take Fadogia and Tongkat Ali at the same time?
Yes — this is the most common stacking pattern in Australia. The two work via different proposed mechanisms, with Tongkat Ali addressing cortisol and SHBG and Fadogia theorised to support Leydig cell function. Combo formulas like the Eternal Elixir Tongkat Ali + Fadogia 2010 mg deliver both in a single capsule.
How long does Fadogia take to work?
Subjective effects on libido and gym performance typically appear in week three or four. Peak effects are reported around weeks six to eight, after which a cycle break is recommended.
Is Fadogia agrestis safe for long-term use?
The honest answer: no one knows. There are zero long-term human studies on Fadogia. Rodent studies suggest cycling is wise. Eight weeks on, four weeks off is the safest commonly used pattern. Continuous use beyond eight weeks is not supported by current evidence.
Should I take Fadogia on an empty stomach?
No. Fadogia’s active saponins absorb better with food, particularly food containing some fat. Taking it on an empty stomach can also cause light-headedness or nausea in sensitive users.
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