Does not work · Performance
Testosterone boosters
also: Tribulus, D-aspartic acid
Sold for more testosterone and muscle mass
Does not work
Well studied with no effect found. Still sold in large quantities.
Tribulus terrestris has not been shown to raise testosterone in humans: a systematic review concludes that the marketing claims are unsubstantiated, and a 2025 review found no robust evidence. D-aspartic acid did not raise testosterone in trained men (3 g for 28 days; 6 g for 12 weeks). In one short study with 6 g, testosterone even dropped. An effect has only been seen in untrained men with low levels.
- Dosage
- Not recommended
- Timing
- —
- Approx. price
- €25–50 per month, wasted
Watch out
Supplements are not checked beforehand for what is in them; see the section Purity and doping. If you have symptoms of low testosterone, have your GP look into it.
Frequently asked questions about supplements
Does Testosterone boosters really work?
Does not work. Well studied with no effect found. Still sold in large quantities.
What does Testosterone boosters cost?
€25–50 per month, wasted
Basics first, then the tub
Supplements are called supplements because they add to something. Sleep, a protein intake that hits your protein calculator , a programme where you lift progressively heavier and enough food together do a hundred times more than the best-researched item on this list. Once those are in place, creatine, caffeine and vitamin D in winter are the three you can spend money on with a clear conscience — for less than ten euros a month combined.
Sources
- Qureshi A et al. (2014). A systematic review on the herbal extract Tribulus terrestris and the roots of its putative aphrodisiac and performance enhancing effect. J Diet Suppl 11(1):64-79. (systematic review)
- Effects of Tribulus (Tribulus terrestris L.) supplementation on erectile dysfunction and testosterone levels in men: a systematic review of clinical trials (2025). Nutrients 17(7):1275. (systematic review)
- Willoughby DS, Leutholtz B (2013). D-aspartic acid supplementation combined with 28 days of heavy resistance training has no effect on body composition, muscle strength, and serum hormones in resistance-trained men. Nutr Res 33(10):803-810. (randomized trial, n = 20)
- Melville GW et al. (2015). Three and six grams supplementation of d-aspartic acid in resistance trained men. J Int Soc Sports Nutr. (randomized trial)
More supplements in this category
Last updated: October 2026
This page summarises scientific research and is not medical advice. If you take medication, are pregnant or have a liver, kidney or thyroid condition, discuss supplements with your doctor or pharmacist — even the innocent-looking ones.
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