Tribulus is a common dietary supplement, so unlike prescription drugs, practical regimens for it can be discussed. But the "right" dose here depends on what you expect: no effect has been found for increasing testosterone in healthy people, and there is some clinical data for libido. The editors collected how tribulus was taken in research and how to transfer it to everyday practice.
First define the goal
Before talking about the dosage, it is worth honestly answering the question: why do you need tribulus? It depends on whether taking it makes sense at all. Controlled studies have not confirmed that tribulus increases testosterone in healthy men (Neychev, Mitev, 2005) or accelerates strength gains in trained athletes (Antonio et al., 2000; Rogerson et al., 2007).
The most reasonable goal is to support libido and sexual function. A randomised study by Kamenov et al. (2017) in men with mild to moderate erectile dysfunction and a study in women with reduced sexual desire (Akhtari et al., 2014; Vale et al., 2018) showed positive results compared to placebo.
Some athletes consider tribulus for recovery. This line is based on one small study in boxers (Ma et al., 2017), so expectations here should be very modest. If your goal is strength and mass, it is more rational to turn to creatine, a sufficient amount of protein and a well-thought-out training program.
If you experience severe fatigue, decreased libido, erectile dysfunction or other symptoms that you associate with hormones, the first step should not be a supplement, but a doctor's consultation and tests. Such symptoms may have causes that require treatment.
Doses from clinical trials
There is no single "official" dose of tribulus, because extracts differ in composition. The most reliable guide is the doses used in the studies, taking into account that these were specific standardised products. The main data is summarized below.
| Research | Purpose | Daily dose | Duration |
|---|---|---|---|
| Kamenov et al., 2017 | Erectile function | 750 mg (3 × 250 mg) standardised extract | 12 weeks |
| Santos et al., 2014 | Erectile function | 800 mg | 30 days |
| Rogerson et al., 2007 | Strength, body composition | 450 mg | 5 weeks |
| Antonio et al., 2000 | Strength, body composition | 3.21 mg/kg body weight | 8 weeks |
| Ma et al., 2017 | Recovery | 1250 mg | 3 weeks |
As you can see, the studied range is approximately 250 to 1250 mg of extract per day. For a person weighing 80 kg, the dose according to Antonio would be about 250 mg, while in the study on boxers the dose was five times higher. Positive results regarding sexual function are obtained mainly in the range of 750–800 mg per day.
A practical approach for a healthy adult is to start at the lower end of the range, such as 250 mg once or twice daily, assess tolerability over a week, and only then increase as needed to the dose used in the study that meets your purpose. Exceeding doses from research has no evidentiary basis, nor does it make sense from the point of view of safety.
An important nuance: the studies indicate the dose of the extract itself, often standardised by saponins. If your product is ground grass without standardization, a direct comparison is not correct. We write in detail about the choice of form in a separate material.
Timing and taking tribulus with food
There is no scientifically based "ideal time" for taking tribulus. No study compared morning and evening intake. Therefore, the main criteria are portability and convenience, which ensure regularity.
- During or after meals. Saponins can irritate the stomach; taking with food reduces the risk of nausea and heartburn.
- Divide into 2–3 doses. In the Kamenov study, the daily dose was divided into three doses; it also reduces the burden on the digestive tract.
- Regularity is more important than an hour. Effects on libido were evaluated after weeks of daily intake, not after a single dose.
- Avoid evening use if sleep is affected. If you notice restless sleep, move the final dose to earlier in the day.
There is no reason to tie taking it to training: tribulus does not have an acute ergogenic effect, like, for example, caffeine. Take it at a time when it's easiest for you to remember, such as with breakfast and lunch.
Swallow the capsules with a sufficient amount of water. Due to its pronounced bitterness, the powder form is better mixed with rich-tasting drinks or yogurt, but remember that it is more difficult to precisely follow the dose.
Course duration and breaks
Clinical studies of tribulus lasted from three to twelve weeks. It is this period that can be considered relatively studied from the point of view of portability. There are no data on the safety of long-term, multi-month or multi-year use.
The popular advice "to alternate weeks of taking and taking a break so that addiction does not occur" has no scientific confirmation: the mechanism of developing tolerance to tribulus has not been described. However, breaks are appropriate for another reason — limiting long-term exposure to a substance with insufficiently studied long-term safety.
Reasonable practice - a course that does not exceed the duration of research (up to 8-12 weeks), after which a break and an honest assessment: whether there was a noticeable effect. If in two or three months of regular intake you have not felt any changes, there is no point in continuing.
During long-term use, pay attention to unusual symptoms on the part of the kidneys and liver: a change in the colour of urine, a decrease in its amount, swelling, yellowness of the skin. Although such reactions have been described only in isolated cases (Talasaz et al., 2010), they cannot be ignored.
Typical mistakes and how to evaluate the result
The first mistake is "more is better". Some users take several grams per day in the hope of getting a noticeable effect on testosterone. A study by Neychev and Mitev (2005) with doses up to 20 mg/kg showed no changes in hormones, so increasing the dose does not solve the problem of lack of effect, but only increases the risk of adverse reactions.
The second mistake is the simultaneous dose of several "boosters" with tribulus in the composition. As a result, the actual total dose is unknown, and the combination with stimulants increases the risk of insomnia, tachycardia, and increased blood pressure. Check the ingredients of all the products you take.
The third mistake is to evaluate the result "by feeling" after a few days. Effects recorded in libido studies appeared after weeks. For an honest assessment, determine in advance exactly what you want to change and record how you feel regularly.
The fourth mistake is to ignore contraindications. Pregnancy, breastfeeding, kidney and liver diseases, hormone-dependent conditions and taking a number of medications require consultation with a doctor before starting the course.
Editorial conclusions
In clinical studies, tribulus was used in doses of approximately 250 to 1250 mg of extract per day for 3–12 weeks; the most reasonable range for libido support is about 750-800 mg per day, divided into several doses.
It is best to take the supplement with food to reduce stomach irritation, and choose the time of day based on sleep and convenience. Attachment to training is not required.
It is advisable to limit the course by the duration of research and evaluate the result; if there is no effect, there is no point in continuing. Tribulus is not an effective tool for increasing strength and muscle mass.
We also advise you to read "Tribulus: release forms and which one to choose", "Tribulus side effects" and "Tribulus benefits for athletes: evidence base".
List of used literature
- Kamenov Z, Fileva S, Kalinov K, Jannini EA. Evaluation of the efficacy and safety of Tribulus terrestris in male sexual dysfunction â a prospective, randomized, double-blind, placebo-controlled clinical trial. Maturitas. 2017;99:20â26.
- Santos CA Jr, Reis LO, Destro-Saade R, Luiza-Reis A, Fregonesi A. Tribulus terrestris versus placebo in the treatment of erectile dysfunction: a prospective, randomized, double blind study. Actas Urol Esp. 2014;38(4):244â248.
- Rogerson S, Riches CJ, Jennings C, et al. The effect of five weeks of Tribulus terrestris supplementation on muscle strength and body composition during preseason training in elite rugby league players. J Strength Cond Res. 2007;21(2):348â353.
- Antonio J, Uelmen J, Rodriguez R, Earnest C. The effects of Tribulus terrestris on body composition and exercise performance in resistance-trained males. Int J Sport Nutr Exerc Metab. 2000;10(2):208â215.
- Ma Y, Guo Z, Wang X. Tribulus terrestris extracts alleviate muscle damage and promote anaerobic performance of trained male boxers and its mechanisms: roles of androgen, IGF-1, and IGF binding protein-3. J Sport Health Sci. 2017;6(4):474â481.
- Neychev VK, Mitev VI. The aphrodisiac herb Tribulus terrestris does not influence the androgen production in young men. J Ethnopharmacol. 2005;101(1â3):319â323.
- Vale FBC, Zanolla Dias de Souza K, Rezende CR, Geber S. Efficacy of Tribulus terrestris for the treatment of premenopausal women with hypoactive sexual desire disorder: a randomized double-blinded, placebo-controlled trial. Gynecol Endocrinol. 2018;34(5):442â445.
- Talasaz AH, Abbasi MR, Abkhiz S, Dashti-Khavidaki S. Tribulus terrestris-induced severe nephrotoxicity in a young healthy male. Nephrol Dial Transplant. 2010;25(11):3792â3793.
