The supplement market sells a comforting story: you can buy discipline in a tub. Reality is meaner and simpler: a few supplements work, most do little, and “testosterone boosters” are largely marketing with a hormone-shaped logo.
Creatine is the boring king for resistance training. It increases intramuscular creatine/phosphocreatine, which improves repeated high-intensity efforts (more reps, more total work), and that tends to compound into strength and lean mass over time. The International Society of Sports Nutrition’s creatine position stand and update materials consistently describe creatine monohydrate as effective and well-supported. (Springer) A 2024 meta-analysis of creatine plus resistance training found larger gains in maximal strength versus placebo. (MDPI) The catch—because there is always a catch—is that some of the early “lean mass” increase can be water inside the muscle, not instant new contractile tissue. That is not a scam; it is physiology. If you expected pure dry muscle in week one, you bought a fantasy, not a supplement.
Creatine dosing is not mystical. You either load to saturate faster (about 20–25 g/day split into doses for 5–7 days, then maintain 3–5 g/day), or you skip loading and take 3–5 g/day and saturate more slowly. (PMC) Timing matters less than daily consistency; “best time” debates are mostly procrastination wearing a lab coat. On safety: in healthy people, creatine monohydrate is generally well tolerated in the research literature, and a 2025 meta-analysis found no statistically significant change in glomerular filtration rate versus control overall. (PMC) If someone has known kidney disease, unexplained reduced kidney function, or is on nephrotoxic medications, this stops being gym chat and becomes a clinician/labs decision.
HMB (β-hydroxy-β-methylbutyrate) is where people want a yes/no answer and the data responds with “it depends.” The more honest summary is: HMB looks most plausible in older adults, sarcopenia, disuse/atrophy contexts, or when recovery capacity is limited; in healthy, trained lifters, extra benefit is often small or inconsistent. The 2025 ISSN position stand on HMB lays out plausible mechanisms and potential use-cases, but it also acknowledges variability in outcomes across conditions. (Taylor & Francis Online) A 2025 systematic review/meta-analysis in older adults doing resistance training found modest improvements in functional outcomes (e.g., handgrip/overall function) without clear improvements in lean mass or muscle quality; and it flags risk of bias in several trials. (PMC) Other syntheses in sarcopenic populations report some performance benefits but minimal effects on muscle mass/strength overall. (Frontiers) Translation: HMB is not “useless,” but for a typical healthy gym-goer it is rarely the best first euro spent.
“Testosterone boosters” are the supplement aisle’s finest fiction: a product category defined by what it implies, not what it reliably does. In healthy men, many common ingredients either do not meaningfully raise testosterone, or the evidence is inconsistent, or any hormonal change does not translate into measurable strength/hypertrophy. Tribulus terrestris, for example, has repeatedly disappointed in controlled settings; reviews note a lack of consistent testosterone increases. (PMC) D-aspartic acid has also shown null results for testosterone in athletes in randomized work. (MDPI) Ashwagandha is the “best dressed” of the group: there is evidence it can reduce stress markers and in some studies modestly increase testosterone—often in stressed, older, or specific subgroups—but that is not the same as “this will build you muscle like actual training plus protein plus creatine.” (Office of Dietary Supplements) The other problem is quality control: “testosterone booster” products are frequently proprietary blends with scattershot dosing, and supplement markets are not designed for pharmaceutical-grade reliability. (PMC) If someone truly has low testosterone symptoms, self-medicating with supplement cocktails is a delay tactic. Get labs, get a diagnosis, fix sleep, energy balance, alcohol, and medications first.
So, are there actually working supplements for resistance training? Yes—just fewer than people want, and they work by helping you train better, not by replacing training.
If you force a ranked list based on the quality of evidence for resistance training outcomes:
- Creatine monohydrate: strongest, most repeatable benefit for strength/high-intensity training capacity. (Springer)
- Protein (food first; powder if needed): not a “preworkout trick,” but essential for adaptation if intake is low. (This is the unglamorous foundation.)
- Caffeine: reliably improves performance in many contexts; ISSN cites effective doses typically 3–6 mg/kg (sometimes lower works), usually taken ~60 minutes pre-training, with side effects rising at higher doses. (Springer)
- β-alanine: mainly helps efforts in the ~60–240 second range and high-rep fatigue resistance; less convincing as a pure “max strength” supplement. Typical protocols are 4–6 g/day for at least 2–4 weeks, with tingling as the common side effect. (PubMed)
- HMB: situational—more defensible for older/sarcopenic/disuse contexts than for already-trained lifters. (PMC)
- “Testosterone boosters”: mostly noise; occasionally a small signal in narrow populations; unreliable for gym outcomes and often the worst value-per-euro. (MDPI)
The uncomfortable bottom line is also the useful one: if someone is under-eating protein and over-eating refined carbs, their “best supplement” is not HMB or a booster blend—it is a protein-serving at each meal plus a training plan they can execute for months. Then, if they want one add-on that actually earns its keep: creatine. Everything else is optional fine-tuning or expensive procrastination.
