The Study
Nutritional Supplements for Muscle Hypertrophy: Mechanisms and Morphology—Focused Evidence
This study didn't do any new experiments—it just looked at what other studies found and tried to make sense of the big picture. It says things like 'protein might help when you don't eat enough,' but it can't prove that protein actually makes muscles bigger—it just sees a pattern in other people's results.
Analysis score
Maximum 5 for a narrative review.
Where the score came from
Some supplements help your muscles get bigger when you lift weights, but only if you're not already eating enough protein — and only certain ones work at all.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 52 / 100
Quality score
Systematic reviews and meta-analyses of cohort studies. They sit above a single cohort study but below a single randomized trial, because the underlying evidence is still observational.
Key takeaways
Summary
Based on the study abstract and findings.
- 1A 1–2 mm muscle thickening is small but measurable — like gaining a thin coin’s width of muscle; it’s not dramatic, but it’s real hypertrophy, not just water or glycogen.
- 2Protein helps muscles grow 1–2 mm thicker if you eat less than 1.6g per kg of body weight daily; creatine adds 1–2 mm thickness after 8–12 weeks; HMB only helps if you're dieting or training super hard; omega-3, citrulline, and collagen don't make muscles bigger.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Nutrients
Year
2025
Authors
Andreea Maria Mănescu, Simona Ștefania Hangu, D. Mănescu
Related Content
Claims (10)
Taking citrulline supplements may help improve blood flow and allow more repetitions during high-repetition, short-rest workouts, but it does not cause measurable increases in muscle size over time.
Taking creatine supplements leads to higher levels of creatine in muscles, improves the ability to regenerate energy during intense workouts, and over 8 to 12 weeks, allows for more total training and measurable muscle growth.
Taking fish oil supplements containing EPA and DHA may lead to very small or negligible gains in muscle size and strength for most people, and these changes are not large enough to be meaningful in a clinical or practical sense.
Taking collagen supplements does not help muscles grow larger if you are already consuming enough total protein and vitamin C, because collagen does not contain the right amino acids or biological mechanism to directly stimulate muscle growth.
Ultrasound and MRI can better detect actual muscle growth by distinguishing it from temporary changes like water retention or glycogen storage, whereas methods like DXA or BIA measure total lean mass and cannot separate these factors.
Taking 3 grams of HMB daily may increase muscle growth in resistance-trained adults only when they are under high training stress or not consuming enough calories; in well-fed, trained individuals, it typically has little to no effect on muscle growth.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.