Why Most Muscle-Building Supplements Do Not Work
The supplement market is flooded with products promising rapid muscle gains. The reality is harsher: most supplements lack strong scientific support. In this guide we sort supplements into three tiers based exclusively on human studies and meta-analyses.
This article is for resistance trainers who want to invest their money and time in supplements that actually deliver.
TL;DR
- Creatine monohydrate is the most thoroughly researched and reliably effective muscle-building supplement
- Protein powder (whey or plant) helps only if you are not getting enough protein from food (1.6-2.2 g/kg)
- HMB may benefit beginners or those returning from a training break, but does little for experienced lifters
- Testosterone boosters, BCAAs, and glutamine are not proven to be effective for muscle growth
- Creatine dose: 3-5 g daily, every day, no loading phase required
A-Tier: Strong Evidence
Creatine Monohydrate
Creatine has been studied more than any other sports supplement. The ISSN position stand confirms its safety and efficacy (Kreider et al., 2017). Creatine increases phosphocreatine stores in muscles, which better supports high-intensity efforts.
What the research shows:
- Muscle mass gain: +1-2 kg more over 8-12 weeks of training compared to placebo
- Strength: +5-10% improvement in force and power output
- Safe for long-term use in healthy adults
Dose: 3-5 g daily, every day. A loading phase (20 g daily for 5-7 days) speeds up saturation but is not required.
Common trap: Monohydrate is the most studied form. More expensive forms (HCl, buffered) have not demonstrated superiority.
Protein Supplement (Whey, Casein, Plant)
A meta-analysis (Morton et al., 2018) showed that protein supplementation increases muscle mass during resistance training -- but only when total protein intake would otherwise be insufficient.
Key number: 1.6-2.2 g of protein per kilogram of bodyweight per day is the optimal range for muscle growth.
Practical rule: If you already get 80+ g of protein from food (for an 80 kg person, that means roughly 130-175 g per day), a protein supplement is convenience, not necessity.
| Protein type | Digestion speed | Best use | Cost per serving |
|---|---|---|---|
| Whey | Fast (1-2 h) | Post-workout | 0.60-1.20 EUR |
| Casein | Slow (4-6 h) | Before bed | 0.80-1.50 EUR |
| Plant (pea + rice) | Medium (2-3 h) | For vegans | 0.70-1.40 EUR |
B-Tier: Moderate Evidence
HMB (Beta-Hydroxy Beta-Methylbutyrate)
HMB is a metabolite of leucine that may reduce muscle protein breakdown. Studies show moderate results in beginners and in people returning from a training layoff, but the effect is small or absent in trained individuals (Maughan et al., 2018).
Dose: 3 g daily, split into 3 servings.
Caffeine
Caffeine does not directly build muscle, but it improves exercise performance by 3-9%, which indirectly increases training volume and thereby supports muscle growth.
Dose: 3-6 mg/kg bodyweight, 30-60 minutes before training.
C-Tier: Weak or No Evidence
BCAAs (Branched-Chain Amino Acids)
BCAAs were once popular, but today there is no justification for taking them if you consume adequate protein. Studies do not show benefits from supplemental BCAAs beyond what sufficient total protein provides (Maughan et al., 2018).
Testosterone Boosters
Most natural testosterone boosters (tribulus, ashwagandha, D-aspartic acid) do not meaningfully support muscle growth in clinical terms. Ashwagandha may help with stress reduction, but its direct muscle-building effect is small.
Glutamine
Glutamine is an important amino acid, but supplementing it does not improve muscle growth in healthy athletes according to current evidence.
Muscle Growth Supplement Comparison Table
| Supplement | Evidence | Effect on muscle | Dose | Cost/month |
|---|---|---|---|---|
| Creatine monohydrate | Strong | +1-2 kg / 12 weeks | 3-5 g/day | 5-10 EUR |
| Whey protein | Strong* | +0.5-1 kg / 12 weeks | 20-40 g/day | 20-40 EUR |
| HMB | Moderate | +0.5 kg / 12 weeks (beginners) | 3 g/day | 15-25 EUR |
| Caffeine | Moderate | Indirect (better training) | 3-6 mg/kg | 5-10 EUR |
| BCAAs | Weak | None if protein is adequate | 5-10 g/day | 15-30 EUR |
| Test boosters | Weak | Minimal | Varies | 20-50 EUR |
*Only if dietary protein is insufficient
Five Most Common Mistakes
1. Supplements before fundamentals — training and nutrition account for 95% of results. Supplements add the last 5%
2. BCAAs alongside whey protein — whey already contains all BCAAs. Double-paying for the same thing
3. Worrying about the loading phase with creatine — skipping it is fine, but expect results to build up more slowly
4. Avoiding cheap creatine — monohydrate is monohydrate. Expensive does not mean better
5. Obsessing over protein timing — total daily intake matters far more than whether you drink a shake at 30 or 60 minutes post-workout
Frequently Asked Questions
Can I take creatine every day, including rest days?
Yes. Creatine works by building up phosphocreatine stores in muscle. This requires consistent daily intake, rest days included.
Can women take creatine?
Absolutely. Creatine benefits are the same for men and women. The myth that creatine makes women bulky is false -- any small weight gain comes from water retention in muscles, not fat.
Can whey protein damage kidneys?
In healthy individuals, high protein intakes (up to 2.2 g/kg) have not shown kidney-damaging effects. Consult your doctor if you have an existing kidney condition.
Do I need a pre-workout for muscle growth?
A pre-workout is essentially caffeine plus extras. If you drink coffee before training, a separate pre-workout may be unnecessary. Check whether your pre-workout already contains creatine -- if so, you do not need to buy it separately.
Summary
Creatine monohydrate and adequate protein are the only supplements with strong evidence for supporting muscle growth. Everything else is either indirect (caffeine), situational (HMB), or unproven (BCAAs, testosterone boosters). Invest in your training programme and nutrition first.
MaxFit offers quality creatines, protein supplements, and pre-workout products for athletes in Estonia.
References
1. Kreider, R.B., Kalman, D.S., Antonio, J., Ziegenfuss, T.N., Wildman, R., Collins, R., Candow, D.G., Kleiner, S.M., Almada, A.L. & Lopez, H.L. (2017). International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition, 14, 18.
2. Morton, R.W., Murphy, K.T., McKellar, S.R., Schoenfeld, B.J., Henselmans, M., Helms, E., Aragon, A.A., Devries, M.C., Banfield, L., Krieger, J.W. & Phillips, S.M. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength. British Journal of Sports Medicine, 52(6), 376-384.
3. Maughan, R.J., Burke, L.M., Dvorak, J., Larson-Meyer, D.E., Peeling, P., Phillips, S.M., Rawson, E.S., Walsh, N.P., Garthe, I., Geyer, H., Meeusen, R., van Loon, L.J.C., Shirreffs, S.M., Spriet, L.L., Stuart, M., Vernec, A., Currell, K., Ali, V.M., Budgett, R.G. & Engebretsen, L. (2018). IOC consensus statement: dietary supplements and the high-performance athlete. British Journal of Sports Medicine, 52(7), 439-455.
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