Evidence checked: 19 July 2026
Products marketed to men sit in three very different categories: nutrients used to correct a deficiency, herbal products sold as a testosterone booster, and prescription testosterone replacement therapy (TRT). They are not interchangeable.
The right first step is not a booster. Symptoms and at least two reliable blood results are needed to diagnose androgen deficiency. Australian guidance advises morning, preferably fasting, testing because hormone levels change through the day and can vary between tests.[1]
Fatigue, low mood, reduced muscle strength, low sex drive and erection problems can occur with low testosterone, but also with sleep apnoea, obesity, diabetes, depression, medicines, alcohol use, thyroid disease, relationship stress or other conditions. A supplement can delay the right diagnosis.
Clinical bottom line: Retail products do not replace medical assessment. Prescription testosterone can suppress sperm production and is not appropriate for a man trying to conceive. Unapproved online hormone products may contain undisclosed or harmful ingredients.
Low testosterone in men needs diagnosis before supplements
This sex hormone is made mainly by the testes under pituitary control. A diagnosis is not based on age, symptoms or one home test. Australian guidance combines medical history, examination, repeated morning blood tests and, where indicated, total testosterone, sex hormone-binding globulin, free testosterone, luteinising hormone, follicle-stimulating hormone and prolactin.[1,2]
Results can be temporarily affected by acute illness, under-eating, poor sleep, heavy drinking, some medicines and recent changes in weight. Low testosterone levels with symptoms may indicate a gonadal or hypothalamic-pituitary problem; the pattern of other hormones helps locate it.
There is no single symptom that proves deficiency. Breast enlargement, loss of body hair, smaller testicular volume, infertility or reduced bone density warrant proper assessment. Sudden severe headache or vision change with hormonal symptoms needs urgent medical review.
Best testosterone supplements: what product research found
A 2020 analysis of 50 “T booster” products found 109 unique ingredients. Although 90% claimed to boost testosterone, only 24.8% had ingredient data supporting an increase; 61.5% had no data on hormone effects. Some products exceeded upper intake levels for nutrients including magnesium and vitamin B3.[4]
A 2024 systematic review examined 52 studies covering 27 proposed boosters across athletes, healthy men, infertile men and men with late-onset hypogonadism.[3] Different extracts, doses and populations produced mixed findings. An effect from one standardised ingredient cannot validate a multi-ingredient formula.
This is why “science-backed” on a label is insufficient. Ask whether the whole product was tested, whether participants were deficient, whether total or free testosterone changed, whether sexual function or symptoms improved, and whether harms were reported.
Zinc, magnesium and vitamin D for testosterone levels
Zinc is an essential mineral involved in testosterone production. A 2023 systematic review found zinc status correlated with serum testosterone, and that response to zinc supplementation varied with baseline mineral and hormone status, elemental amount, form and duration.[5] Correcting zinc deficiency is different from trying to increase the hormone in someone who is replete.
The same boundary applies to magnesium and vitamin D. Low levels can coexist with poor health, restrictive diets or obesity without proving that extra intake will boost your testosterone naturally. Test or assess a credible deficiency, correct it to an appropriate range, and avoid stacking nutrient products above safe limits.
Boron appears in some products, but small short-term studies do not establish a dependable clinical benefit. Dehydroepiandrosterone (DHEA) is a hormone precursor, not an ordinary vitamin; its legal, medical and anti-doping implications require professional advice.
Ashwagandha, fenugreek and tongkat ali evidence
Systematic reviews report possible changes in levels of testosterone with selected standardised extracts of these herbs. The trials are generally small and vary by extract, population and outcome. They do not establish a universal winner for all men, and a branded extract result does not transfer to every herbal blend.
Ashwagandha now has a particularly important Australian safety boundary. On 7 July 2026, the TGA updated its warning about very rare liver injury associated with Withania somnifera. Most reported Australian cases resolved after stopping, but some required hospitalisation.[6]
Stop an ashwagandha product and seek medical advice for yellow skin or eyes, dark urine, unusual tiredness, weakness, abdominal pain, loss of appetite, persistent nausea or vomiting. People with current or previous liver problems should not self-start it. The other named herb can affect blood glucose and interact with medicines; tongkat ali product identity and contaminant testing also matter.
Do testosterone boosters work for symptoms?
A higher laboratory number is not automatically a health benefit. Trials should assess sexual desire, energy, strength, body composition, mood and adverse effects, not only a hormone concentration. Many studies are too short to establish durable benefits or longer-term safety.
Sex drive and erections are related but different. Erectile dysfunction can be an early marker of vascular disease even when testosterone levels are normal. Treating every sexual concern as hormone deficiency can miss cardiovascular, medicine, neurological and psychological causes.
Lifestyle changes can improve physical and mental health and may support natural testosterone levels when they address a cause. Priorities include treating sleep apnoea, resistance training, adequate energy and protein, reducing excess body weight where relevant, moderating alcohol, stopping smoking and managing chronic disease. These steps are not guaranteed hormone treatments, but they address common drivers.
TRT is not a testosterone supplement
Testosterone replacement therapy is prescription medicine for confirmed deficiency. In Australia, the hormone is illegal to possess or supply without a prescription or permit. TRT requires monitoring of symptoms, testosterone level, blood count and other risks.[1]
External testosterone reduces pituitary signals to the testes and can markedly impair sperm production. Australian guidelines state that testosterone therapy should not be prescribed to men with reproductive intent.[2] Anyone planning children should raise fertility before any hormone treatment.
This therapy also needs assessment of prostate, cardiovascular, sleep-apnoea and haematocrit risks. It is not a bodybuilding shortcut, an anti-ageing tonic or a substitute for investigating reversible causes.
Online testosterone-boosting supplements and contamination
The TGA warned in May 2026 that unapproved online health products may be fake, incorrectly dosed, contaminated or contain undisclosed ingredients.[7] It separately warns that performance products can contain anabolic-androgenic steroids, SARMs, stimulants or other substances not declared on the label.
An AUST L or AUST R number can help identify an Australian therapeutic good, but does not prove that a product will increase your testosterone levels. Competitive athletes also need current Sport Integrity Australia advice and batch testing; no supplement is completely free of contamination risk.
Testosterone supplement questions
Should a man take testosterone supplements?
Not automatically. A man with symptoms should first have causes assessed and low results confirmed. A nutrient may be appropriate for a verified deficiency; prescription therapy requires medical oversight; retail boosters have mixed evidence and product-specific risks.
Which supplement is best for testosterone?
There is no universal product winner. The right intervention depends on diagnosis. Correcting a genuine zinc or vitamin D deficiency differs from taking herbs when levels are normal, and neither replaces care for confirmed hypogonadism.
What are signs of low testosterone in men?
Possible symptoms include reduced libido, fewer spontaneous erections, fatigue, lower muscle strength, low mood, infertility, reduced body hair or breast enlargement. These are not specific, so symptoms of low testosterone require clinical assessment and repeat morning tests.
How do you increase male testosterone?
Treat the cause. This can mean addressing sleep apnoea, weight, under-nutrition, alcohol, medicines or chronic disease; correcting a documented nutrient deficiency; or using prescribed hormone replacement for confirmed deficiency when reproductive goals are not being pursued.
References
- Healthy Male. Testosterone replacement therapy: what is it and do you need it?. Updated 2025.
- Healthy Male. Clinical guidelines for the management of male infertility. Accessed 19 July 2026.
- Morgado A, et al. Do “testosterone boosters” really increase serum total testosterone? A systematic review. International Journal of Impotence Research. 2024;36(4):348–364. doi:10.1038/s41443-023-00763-9. PubMed
- Clemesha CG, et al. “Testosterone boosting” supplements: composition and claims are not supported by the academic literature. World Journal of Men’s Health. 2020;38(1):115–122. doi:10.5534/wjmh.190043. PubMed
- Te L, et al. Correlation between serum zinc and testosterone: a systematic review. Journal of Trace Elements in Medicine and Biology. 2023;76:127124. doi:10.1016/j.jtemb.2022.127124. PubMed
- Therapeutic Goods Administration. Withania somnifera (ashwagandha) and very rare risk of liver injury. 7 July 2026.
- Therapeutic Goods Administration. Buying health products safely online. 18 May 2026.
Author bio
Prepared for Nutrition Market under Charles Gumbley’s practitioner-led editorial system. Nutrition Market sells supplements; this article contains no product, category, price, stock or purchase links.
Evidence checked: 19 July 2026. General information only; it does not replace medical, endocrinology, fertility or pharmacy care.
