Written by Charles Gumbley, BHSc (Clinical Nutrition), DipHSc (Western Herbal Medicine)
Last evidence check: 19 July 2026
This content is for general educational purposes only and is not personalised medical or sports-nutrition advice. Seek professional advice before using a supplement if you are pregnant or breastfeeding, under 18, have kidney or liver disease, take medicines, compete under anti-doping rules, or have a diagnosed health condition.
Key takeaways
- Progressive resistance training, sufficient food energy, protein and recovery drive muscle growth.
- Creatine monohydrate has the strongest direct evidence among common muscle building supplements for suitable adults.
- Whey protein or another protein powder is mainly a convenient way to fill a dietary protein gap.
- BCAAs, HMB, omega-3 and magnesium do not have equal evidence for increasing muscle mass.
- Competitive athletes should verify the exact product batch through Sport Integrity Australia every time.
Conflict disclosure: Nutrition Market sells sports nutrition supplements. This guide ranks evidence, not brands or products. Product feeds and shop links remain disabled during practitioner review.
Best supplements for muscle growth: what earns a place
A trustworthy answer is not the longest stack. A useful option needs evidence that it adds to a sound resistance-training program, a reason it suits the person, an acceptable safety profile and a reliable product.
That produces a short evidence hierarchy:
Scroll sideways to read the full table →
| Priority | Option | Practical interpretation |
|---|---|---|
| Strongest direct case | Creatine monohydrate | Can add to strength and lean body mass gains when combined with resistance training in suitable adults |
| Conditional tool | Protein powder, including whey protein | Useful when food alone does not reliably provide enough high-quality protein |
| Lower priority for hypertrophy | BCAAs, HMB, omega-3, magnesium | May have other roles, but current evidence does not support treating them as equivalent muscle growth supplements |
| Avoid | SARMs, prohormones and unverified muscle builders | Drug-like, regulatory, contamination and health risks outweigh retail promises |
This distinction matters because studies measure different outcomes. Body weight includes water and fat. Lean body mass includes water and other non-fat tissue. Muscle thickness or cross-sectional area is closer to hypertrophy. Strength and soreness are useful outcomes, but neither proves that more muscle was built.
As a clinical nutritionist, I would not start with a shopping list. I would first check training progression, total food intake, protein distribution, sleep, symptoms, medicines and the person’s actual goal. A supplement should fill a defined gap, not conceal one.
People who want to gain muscle or increase muscle mass often ask whether certain supplements can help them train harder, improve muscle recovery or boost exercise performance. Dietary supplements cannot overcome inconsistent strength training. A post-workout protein shake can be convenient, but it only supports lean muscle mass when the full program supplies an appropriate stimulus, enough protein and enough energy.
Build muscle with training, protein and energy first
Muscle adapts to repeated mechanical tension. To build muscle, resistance training must provide a progressive stimulus over time. The body also needs enough energy, amino acids and recovery to support that adaptation.
Protein is important, but more is not always better. A varied eating pattern can provide complete protein through dairy, eggs, fish, meat, soy and combinations of plant foods. A credentialled sports dietitian can help an athlete match protein and energy intake to body size, training load, food preferences and competition demands.
Sleep and program design also matter. If training volume is inconsistent or energy intake is too low, adding supplements is unlikely to solve the central problem. A muscle gainer can increase kilojoule intake, but it cannot replace progressive training or guarantee that added body weight will be muscle rather than fat.
Creatine monohydrate and muscle gain
Creatine monohydrate is the most consistently supported option in this group. It increases muscle creatine availability, which can support repeated high-intensity exercise and greater training quality. The Australian Institute of Sport places creatine in Group A for evidence-based use in specific sporting situations.¹ ²
In practical terms, creatine helps increase creatine stores in skeletal muscle. This can support repeated efforts in training, which may help increase the amount or quality of work completed over time.
A 2024 meta-analysis of 12 studies in adults younger than 50 found that creatine plus resistance training increased lean body mass by an average 1.14 kg more than training alone.⁷ That figure is a pooled estimate, not a personal guarantee, and some early lean-mass change can reflect water stored in muscle.
Another 2024 meta-analysis found additional upper- and lower-body strength gains with creatine plus resistance training, although most participants were men.⁸ Strength can allow better training progression, but it should not be relabelled as direct proof of an exact amount of muscle gain.
Creatine monohydrate is the form with the deepest evidence base. More complex creatine blends are not automatically superior. Some people experience temporary water-weight change or gastrointestinal discomfort. Anyone with kidney disease, pregnancy, breastfeeding, medicines or a clinical condition should obtain individual advice before use.
Whey protein, protein powder and leucine
Protein powder is useful when convenience, appetite, dietary restriction or scheduling makes a protein target difficult to meet with food. Whey protein is rich in essential amino acids and leucine, but other complete protein sources can also support muscle protein synthesis.
A network meta-analysis of 116 trials involving 4,711 adults found that protein supplementation combined with resistance training produced modest improvements in muscle mass and strength. Milk proteins, including whey and casein, were among the effective types. The analysis did not find improved physical performance from one timing or protein type.⁹
This does not mean everyone needs whey. The likely value is smaller when total dietary protein is already adequate. Choose a protein powder around the dietary gap, ingredient tolerance and quality, not a claim that one shake creates an anabolic window.
Milk allergy requires avoidance of whey and casein. Lactose content varies. Plant protein powders can be appropriate, but formulation, amino acid profile and total intake matter more than a plant-versus-whey slogan.
BCAAs and branched-chain amino acids
Branched-chain amino acids include leucine, isoleucine and valine. Leucine helps signal muscle protein synthesis, but the body still needs all essential amino acids to build new protein.
A 2022 systematic review found that BCAAs may reduce soreness after resistance exercise, while body-composition and performance benefits were negligible. Many studies did not report total daily protein intake, making the independent contribution of BCAAs difficult to judge.¹⁰
If someone already consumes sufficient complete protein or uses whey protein, a separate BCAA product is usually lower priority for muscle gain. Less soreness can be welcome, but it does not demonstrate greater hypertrophy.
HMB and support muscle growth claims
HMB is a metabolite of leucine and is marketed to support muscle growth or reduce muscle breakdown. The most persuasive context is not healthy trained adults seeking an extra layer for a standard gym program.
A systematic review and meta-analysis in young adults found that HMB did not significantly improve fat-free mass or strength gains from resistance exercise.¹¹ A 2026 meta-analysis in adults aged 50 years and older also found no meaningful additional benefit for muscle mass, body composition or strength when participants could undertake structured resistance training.¹²
Clinical malnutrition, prolonged inactivity and rehabilitation are different questions that need individual assessment. They should not be used to market HMB as a universal muscle-building supplement.
Omega-3 fatty acids, fish oil and muscle
Omega-3s are polyunsaturated fatty acids with established nutritional roles, and fish oil may be considered for reasons related to overall health rather than hypertrophy. That is different from claiming it builds muscle.
A 2023 meta-analysis found no significant effect of omega-3 supplementation on muscle mass or physical function in healthy younger and older adults. It found a very small average strength effect, with moderate certainty and high overall risk of bias in the included studies.¹³
Omega-3 should therefore not displace creatine, adequate protein or the training program in a muscle gain plan. Fish oil can also affect bleeding risk and cause gastrointestinal effects, so medicines and planned procedures matter.
Magnesium and muscle-building claims
Magnesium contributes to normal muscle function, energy metabolism and many enzyme reactions. Correcting inadequate intake or a documented deficiency is a legitimate nutritional goal. It is not evidence that extra magnesium increases muscle growth in someone whose needs are already met.
Low magnesium intake may also point to a broader dietary issue. Nuts, seeds, legumes, whole grains and leafy vegetables provide magnesium along with other nutrients. Supplements vary in elemental magnesium and can cause diarrhoea. Kidney impairment can change safety because magnesium clearance may be reduced.
Use magnesium for an identified nutritional or clinical reason, not because a ranked muscle supplement list needed another item.
Muscle gainer products and fat loss trade-offs
A muscle gainer is usually a concentrated combination of carbohydrate and protein. It can help someone who struggles to eat enough energy, but the product does not determine where all gained weight goes.
A large energy surplus may increase fat gain as well as muscle gain. At the same time, aggressive fat loss can make training performance and recovery harder. The appropriate balance depends on starting body composition, appetite, training phase and sporting requirements.
Before using a gainer, compare its protein, carbohydrate, serving size, allergens and full ingredient list with a simpler food-based snack or shake. Multi-ingredient proprietary blends make it harder to assess what is useful and what creates side effects.
Supplements to take: Australian safety and FAQs
Australian sports supplements may be regulated as foods or therapeutic goods depending on their ingredients, dosage form and claims. Protein powders in food form may be regulated as foods, while some capsules, tablets and higher-risk products are therapeutic goods.⁵ An AUST L or AUST R number identifies an ARTG-listed or registered medicine, but it does not prove superior muscle growth.
Contamination is a separate issue. In a Sport Integrity Australia survey of 200 sports supplements bought online, 35% contained at least one WADA-prohibited substance and 57% of positive products did not list the prohibited ingredient. Muscle builders were one of the higher-risk categories.⁴ This sample does not mean 35% of every product in Australia is contaminated, but it demonstrates why label trust is insufficient.
Competitive athletes should use the Sport Integrity Australia app to check HASTA or Informed Sport certification for the exact batch. Batch testing reduces risk but cannot make a supplement completely risk-free.³
What is the best muscle growth supplement?
Creatine monohydrate has the clearest direct evidence among common supplements for suitable adults doing resistance training. Protein powder can be valuable when it fills a genuine dietary protein gap. Neither replaces training, food energy or recovery.
Which supplement is best for gaining muscle?
The answer depends on the gap. Creatine can add to training adaptations. Whey or another protein powder mainly helps when dietary protein is insufficient or inconvenient. BCAAs, HMB, omega-3 and magnesium should not be treated as equal hypertrophy options.
What increases muscle size fast?
No legal supplement guarantees rapid muscle gain. Progressive resistance training, enough energy and protein, sleep and consistent time are the foundation. Very fast scale-weight change often includes water, glycogen or fat rather than only new muscle tissue.
What supplements are good for building muscle?
Creatine monohydrate and, where needed, a suitable protein powder have the strongest practical case. Other products require a specific reason and realistic expectations. Avoid SARMs, prohormones and unverified hormone or muscle-building products.
Do BCAAs build muscle if I already use whey protein?
BCAAs are usually low priority if total high-quality protein is already adequate. Whey provides BCAAs plus the other essential amino acids needed to build protein. A separate BCAA product may affect soreness but has not shown consistent extra muscle gain.
Is creatine safe for everyone?
No supplement is appropriate for everyone. Creatine is well studied in healthy adults, but individual advice is important with pregnancy, breastfeeding, kidney disease, medicines or other clinical conditions. Athletes must also assess anti-doping and batch risk.
References
- Australian Institute of Sport. Supplements. AIS
- Australian Institute of Sport. AIS Supplement Framework ABCD System. AIS framework
- Sport Integrity Australia. Supplements in sport. Sport Integrity Australia
- Sport Integrity Australia. New supplement survey finds one in three products contain banned substances. 2025. Survey report
- Therapeutic Goods Administration. Sports supplements declared to be medicines. TGA
- Healthdirect Australia. Loss of muscle mass. Healthdirect
- Desai I, et al. The Effect of Creatine Supplementation on Resistance Training-Based Changes to Body Composition: A Systematic Review and Meta-analysis. Journal of Strength and Conditioning Research. 2024;38(10):1813-1821. doi:10.1519/JSC.0000000000004862. PubMed
- Wang Z, et al. Effects of Creatine Supplementation and Resistance Training on Muscle Strength Gains in Adults Under 50 Years of Age: A Systematic Review and Meta-Analysis. Nutrients. 2024;16(21):3665. doi:10.3390/nu16213665. PubMed
- Zhou H-H, et al. Effects of Timing and Types of Protein Supplementation on Improving Muscle Mass, Strength, and Physical Performance in Adults Undergoing Resistance Training: A Network Meta-Analysis. International Journal of Sport Nutrition and Exercise Metabolism. 2023;34(1):54-64. doi:10.1123/ijsnem.2023-0118. PubMed
- Hormoznejad R, et al. Oral Branched-Chain Amino Acids Supplementation in Athletes: A Systematic Review. Nutrients. 2022;14(19):4002. doi:10.3390/nu14194002. PubMed
- Jakubowski JS, et al. HMB does not Improve Resistance Exercise-Induced Changes in Body Composition or Strength in Young Subjects: A Systematic Review and Meta-Analysis. Nutrients. 2020;12(5):1523. doi:10.3390/nu12051523. PubMed
- Wang G, et al. Efficacy of HMB supplementation as an adjunct to resistance training in older adults: a comprehensive meta-analysis. Age and Ageing. 2026;55(3):afag073. doi:10.1093/ageing/afag073. PubMed
- Bird JK, et al. The Influence of n-3PUFA Supplementation on Muscle Strength, Mass, and Function: A Systematic Review and Meta-Analysis. Advances in Nutrition. 2023;14(3):533-544. doi:10.1016/j.advnut.2023.02.004. PubMed
