What does the evidence actually say?

What we hold on creatine, muscle and growth

Read as:creatinemusclegrowth

2 vetted claims match all three terms. Strongest evidence first.

1. Supplementswell supported · human data

   A meta-analysis of 10 randomised trials using direct muscle imaging found that adding creatine to resistance training produces only a very small extra increase in muscle size compared with training plus placebo. Gains in upper- and lower-body muscle thickness were in the region of 0.10-0.16 cm.

   What it shows: Meta-analysis of 10 RCTs (44 outcomes) in healthy adults; the pooled effect was very small and its credible interval crossed zero; several authors declared ties to the creatine industry.Meta-analysis · Nutrients

   Full breakdown →Creatine monohydrate guide →Creatine Calculator →

   Source: The Effects of Creatine Supplementation Combined with Resistance Training on Regional Measures of Muscle Hypertrophy: A Systematic Review with Meta-Analysis. Nutrients 2023
2. Recoverypreliminary · human data

   An umbrella review spanning 15 meta-analyses and 161 studies finds post-exercise cold-water immersion speeds recovery of power, jump performance and soreness, but does not aid strength recovery and impairs strength and muscle growth gains when used routinely.

   What it shows: The widest sweep of this evidence yet, covering 161 studies gathered through 15 earlier pooled reviews, and the pattern is consistent. The catch is that the authors rate the underlying evidence as low quality and inconsistent, so the exact sizes of these effects remain uncertain.Systematic review · Sports Med Open

   Full breakdown →Cold Water Immersion →Recovery Readiness Index →

   Source: Strategic Application of Post-exercise Cold-Water Immersion to Enhance Performance Recovery and Adaptation: An Umbrella Review of 15 Published Systematic Reviews with Meta-analysis. Sports Med Open 2026

Related, not an answer to your question

1. Supplementswell supported · human data

   Creatine supplementation did not improve recovery of muscle strength, soreness, range of motion or inflammation after muscle-damaging exercise across pooled trials; the only change was a lower blood marker of muscle damage at 48 hours.

   What it shows: A solid null: results pooled from 13 trials covering 278 people, mostly men aged 20 to 60. The trials disagreed with each other quite a bit, so the authors still want bigger, tighter studies before closing the book.Meta-analysis · Int J Sport Nutr Exerc Metab

   Full breakdown →Creatine monohydrate guide →Creatine Calculator →

   Source: The Effect of Creatine Supplementation on Markers of Exercise-Induced Muscle Damage: A Systematic Review and Meta-Analysis of Human Intervention Trials. Int J Sport Nutr Exerc Metab 2021
2. Supplementswell supported · human data

   Pooled results from ten randomised trials suggest curcumin supplementation reduces post-exercise muscle soreness and the muscle damage marker creatine kinase, with modest improvements in strength and joint range of motion.

   What it shows: Fairly credible as supplement evidence goes: results pooled from ten randomised trials, all pointing the same modest direction. The trials were small, though, and the authors say larger, higher-quality studies are still needed to confirm the effects and settle long-term safety.Meta-analysis · Phytother Res

   Full breakdown →DOMS explained →Recovery Readiness Index →

   Source: The effect of curcumin supplementation on delayed-onset muscle soreness, inflammation, muscle strength, and joint flexibility: A systematic review and dose-response meta-analysis of randomized controlled trials. Phytother Res 2022
3. Supplementswell supported · human data

   Across 63 trials in 1489 people, adding creatine to resistance training produced greater gains in upper-body strength, lower-body strength and lean mass than training alone, with no significant change in fat mass. The small rise in total body weight was mostly lean tissue, and body-fat percentage dipped slightly.

   What it shows: About as solid as sports nutrition evidence gets: results pooled from 63 trials in 1489 people, most showing the same direction of benefit. The included trials varied in diets and training backgrounds, and the hint that younger lifters gain more strength is exploratory rather than proven.Meta-analysis · J Int Soc Sports Nutr

   Full breakdown →Creatine monohydrate guide →Creatine Calculator →

   Source: Resistance training combined with creatine supplementation: a three-level meta-analysis of multidimensional outcomes from strength enhancement to body composition remodeling. J Int Soc Sports Nutr 2026
4. Recoverywell supported · human data

   Pooled results from 34 randomised trials found that applying photobiomodulation, a light-based therapy, to muscles before exercise improved muscle endurance and speeded recovery of strength and muscle damage markers. The benefit appeared in athletes and physically inactive people but not in moderately active people.

   What it shows: Worth a raised eyebrow rather than a rush to buy a laser: results pooled from 34 trials show modest average benefits, but the strange split, helping athletes and the sedentary yet not regular exercisers, comes from comparisons between subsets of trials that are easy to over-read. The authors themselves note the field is still controversial.Meta-analysis · Lasers Med Sci

   Full breakdown →Muscle damage explained →Recovery Readiness Index →

   Source: Can pre-exercise photobiomodulation improve muscle endurance and promote recovery from muscle strength and injuries in people with different activity levels? A meta-analysis of randomized controlled trials. Lasers Med Sci 2024
5. Supplementswell supported · human data

   Meta-analyses indicate that combining creatine supplementation with resistance training improves ageing muscle mass and upper body strength beyond resistance training alone, and creatine also shows promise for bone mineral density and indices of bone biology.

   What it shows: Reasonably solid for muscle and upper body strength: the conclusion rests on pooled trials of creatine combined with resistance training in the context of ageing. The bone findings are promising rather than proven, and the abstract does not report how large the added benefits are.Meta-analysis · Endocrine

   Full breakdown →Creatine monohydrate guide →Creatine Calculator →

   Source: Creatine supplementation and aging musculoskeletal health. Endocrine 2014
6. Trainingwell supported · human data

   Pooled data from 11 randomised trials in healthy older adults found resistance training raised serum IGF-1 by 17.34 ng/ml and improved leg press and bench press strength, though in subgroups the IGF-1 rise was significant only in women.

   What it shows: Reasonably solid for the strength gains: results pooled from 11 trials in healthy older people, though the hormone finding split oddly, holding up only in women. Why lifting moves IGF-1, and whether a modest rise matters for health, remains unexplained.Meta-analysis · Hormones (Athens)

   Full breakdown →Sarcopenia explained →Strength Standards →

   Source: Effects of resistance training on muscle strength, insulin-like growth factor-1, and insulin-like growth factor-binding protein-3 in healthy elderly subjects: a systematic review and meta-analysis of randomized controlled trials. Hormones (Athens) 2021
7. Trainingwell supported · human data

   A systematic review of seven randomised trials in 260 older adults found that resistance training three times a week, combined with at least 15 g of daily protein mostly from dairy, reduced blood markers that drive muscle loss and raised those that build it, alongside gains in strength, fat-free mass and muscle fibre size.

   What it shows: Promising but thin: a sweep of all the studies turned up just seven trials with 260 older adults between them, and they varied in length and design. The direction is consistent; the ideal amount of protein or training is not settled here.Systematic review · Biomolecules

   Full breakdown →Sarcopenia explained →Protein Intake Calculator →

   Source: Synergistic Effects of Protein Intake and Exercise on Biomarkers of Sarcopenia: A Systematic Review. Biomolecules 2026
8. Trainingwell supported · human data

   In adults 65 and older, resistance training produced significant growth in whole-muscle size and muscle fibre area across 28 pooled trials, yet measures of leg lean mass did not change significantly.

   What it shows: Strong evidence: results pooled from 28 trials where older adults were assigned at random to supervised lifting or a control group. The growth effects were modest in size, and the lean mass scans widely used in ageing research missed changes that direct muscle measurements picked up.Meta-analysis · Exp Gerontol

   Full breakdown →Hypertrophy explained →Training Volume Calculator →

   Source: Lower extremity muscle hypertrophy in response to resistance training in older adults: Systematic review, meta-analysis, and meta-regression of randomized controlled trials. Exp Gerontol 2024

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