What is creatine?
Creatine (usually taken as creatine monohydrate) is a compound your body uses to rapidly regenerate ATP — the “immediate-use” energy your muscle cells burn during short, high-intensity efforts like heavy lifting or sprinting. Supplementing creatine increases intramuscular phosphocreatine stores, which lets you push harder for a few more reps or a bit more load. Over time, those slightly higher training volumes add up to more strength and more lean mass. PMC
This is fundamentally different from creatinine. Creatinine is a breakdown product your kidneys filter out. High creatinine in the blood can indicate reduced kidney function. It is not the supplement you buy for lifting, and supplementing creatine is not the same thing as ingesting creatinine. (That distinction matters if you’re reading lab work.)
When losing weight, we ideally want to spare our skeletal muscle and lose most of the weight from fat. This is more of a concern when losing a lot of weight, such as happens with the GLP-1 medications such as Wegovy and the GLP-1/GIP medication, Zepbound.
Does creatine actually build muscle — or is it just “water weight”?
Short answer: creatine consistently supports increases in lean mass and strength when paired with resistance training. That includes younger adults and, importantly, older adults who are trying to fight age-related muscle loss (sarcopenia). PMC+1
A 2023 systematic review and meta-analysis by Burke and colleagues pooled trials where people lifted weights with or without creatine. They found that creatine plus resistance training produced a “small but positive” increase in direct skeletal muscle hypertrophy (actual muscle size changes measured in the muscle itself, not just scale weight) in both upper and lower body regions compared with training alone. PubMed: https://pubmed.ncbi.nlm.nih.gov/37432300/ ; full text: https://pmc.ncbi.nlm.nih.gov/articles/PMC10180745/ PubMed+1
For older adults, a large review and meta-analysis of randomized controlled trials (RCTs) showed that creatine taken during resistance training led to:
That same paper notes that gains in leg press strength — which is critical for mobility, balance, and fall prevention in aging — tend to improve with creatine, which is clinically meaningful because leg strength declines faster with age than arm strength. https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ PMC
So is it just “water”? Creatine does increase intracellular water (muscle pulls in water along with creatine), especially early on. But across studies lasting 8–12+ weeks of lifting, participants taking creatine generally end up with measurably more contractile lean mass and higher strength outputs than placebo — not just higher total body water. https://pmc.ncbi.nlm.nih.gov/articles/PMC10180745/ ; https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ PMC+1
How big are the gains?
Let’s talk numbers.
Strength:
A 2024 systematic review and meta-analysis (Wang et al.) looked at adults under 50 doing resistance training, and found that adding creatine significantly improved both upper-body and lower-body muscle strength versus training alone. The meta-analysis estimated ~4.4 kg more upper-body strength and ~11.3 kg more lower-body strength compared with placebo groups over 4–12 weeks. PubMed: https://pubmed.ncbi.nlm.nih.gov/39519498/ PubMed
Lean body mass (LBM):
A 2022 review examining age, sex, and exercise type reported that creatine supplementation added ~1.1 kg of lean body mass on average when combined with resistance training, with men tending to gain more LBM than women in the same time frame. PubMed: https://pubmed.ncbi.nlm.nih.gov/35986981/ PubMed
Older adults:
Meta-analysis in older adults (50+ years) shows creatine plus progressive resistance training increases lean tissue mass and both chest press and leg press strength beyond training alone. https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ PMC
Postmenopausal women / elderly:
Individual RCTs in elderly populations also report that low-dose creatine with resistance training over ~12 weeks improves lean mass more than placebo. PubMed: https://pubmed.ncbi.nlm.nih.gov/27239423/ PubMed
Bottom line: The effect size is “modest but real.” We’re not talking steroid-level changes, but consistent, measurable improvements in strength and fat-free mass beyond what training alone delivers.
How does creatine help you train harder?
Several mechanisms have been proposed and observed:
- More phosphocreatine = more total work per set.
Muscles store phosphocreatine to rapidly regenerate ATP during ~5–15 seconds of intense effort. Supplementation raises those stores. That means you can often perform an extra rep or sustain slightly higher load before failure. Over weeks, that higher training volume drives hypertrophy. https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ PMC
- Better recovery between sets.
Faster ATP resynthesis can shorten the effective recovery time between sets of heavy lifting or sprints, allowing higher quality work in the same session. https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ PMC
- Cell volumization / anabolic signaling.
When creatine pulls water into the muscle cell, that “cell swelling” is thought to act like an anabolic signal that may support protein synthesis and reduce protein breakdown. Reviews note this as a plausible contributor to hypertrophy, though it’s not the only factor. https://pmc.ncbi.nlm.nih.gov/articles/PMC10180745/ PMC
Together, the ability to push a little harder, recover a little faster, and accumulate more high-quality reps is what translates into extra strength and muscle over time.
Does creatine work for everyone?
Mostly yes — but not equally.
- Training status matters.
Creatine shows the clearest benefits when paired with structured resistance training. Taking creatine without lifting is not impressive for muscle gain. Studies that gave creatine alone (no actual training stimulus) generally see little or no additional lean mass beyond normal day-to-day variation. https://pubmed.ncbi.nlm.nih.gov/37432300/ ; https://pmc.ncbi.nlm.nih.gov/articles/PMC10180745/ PubMed+1
- Sex differences.
Meta-analytic data suggest men tend to gain more lean mass than women under identical creatine + lifting protocols (roughly +1.46 kg in men vs +0.29 kg in women in one pooled analysis), although women still gain strength and may gain functional muscle even if the scale change is smaller. PubMed: https://pubmed.ncbi.nlm.nih.gov/35986981/ PubMed
- Age.
Younger adults get a small but significant bump in hypertrophy, but older adults may get an even more clinically meaningful benefit: maintaining independence, gait speed, and the ability to stand up from a chair without using arms. https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ PMC
In other words, “non-responder” doesn’t usually mean “nothing happened.” It often means “the measurable increase was small, or we didn’t run the program long enough.”
Typical dosing strategies
Most studies use one of two approaches:
- Loading + maintenance
- ~20 g/day (split into 4 doses of ~5 g) for 5–7 days
- then ~3–5 g/day ongoing
This quickly saturates muscle creatine stores.
- No loading (slow saturation)
- ~3–5 g/day from day one
Takes longer to fully saturate muscle, but ends up in the same place after a few weeks.
Both strategies are represented in the RCTs and meta-analyses showing increased lean mass and strength. https://pmc.ncbi.nlm.nih.gov/articles/PMC10180745/ ; https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ PMC+1
Studies in older adults often use ~3–5 g/day for many weeks alongside progressive resistance training ≥2x/week. https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ PMC
Safety and kidney concerns
This is where the creatine vs creatinine confusion really matters.
Because creatinine is a waste product cleared by the kidneys, people worry that “creatine will wreck your kidneys.” Current evidence in healthy adults does not support kidney harm from standard creatine dosing over months to (in some trials) years. Reviews summarizing dozens of trials and follow-ups up to ~2 years report no serious adverse effects in healthy participants. https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ ; https://jissn.biomedcentral.com/articles/10.1186/s12970-021-00412-w PMC+1
However:
- Creatine supplementation can raise serum creatinine slightly because creatine breaks down into creatinine. That can make lab work look like kidney function got worse even if the kidneys are fine.
- People with known kidney disease or people on nephrotoxic medications should talk to a clinician before starting creatine. The clinical trials generally exclude those populations, so we have less safety data there. https://jissn.biomedcentral.com/articles/10.1186/s12970-021-00412-w BioMed Central
Otherwise, the most common side effects are mild GI upset (especially if you take a big bolus dose on an empty stomach) and short-term water retention/bloating early in supplementation. https://jissn.biomedcentral.com/articles/10.1186/s12970-021-00412-w BioMed Central
Practical takeaways
- Creatine monohydrate is one of the most studied sports supplements in existence. Across randomized trials and multiple meta-analyses, it reliably increases strength and lean mass when combined with progressive resistance training. https://pubmed.ncbi.nlm.nih.gov/37432300/ ; https://pmc.ncbi.nlm.nih.gov/articles/PMC10180745/ ; https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ PubMed+2PMC+2
- The typical effective maintenance dose in research is ~3–5 grams per day of creatine monohydrate.
- The benefits appear in younger lifters (slightly more muscle size), in trained lifters (more reps / more load), and in older adults (more lean tissue and strength that may help preserve function). https://pubmed.ncbi.nlm.nih.gov/35986981/ ; https://pmc.ncbi.nlm.nih.gov/articles/PMC5679696/ PubMed+1
- Safety in healthy adults is generally good, but if you have kidney issues, are older with reduced kidney function, or you’re on medications that affect the kidneys, you should clear it with your clinician and monitor labs — especially creatinine and estimated GFR — because creatine can nudge creatinine upward on paper even without true damage. https://jissn.biomedcentral.com/articles/10.1186/s12970-021-00412-w BioMed Central.
- There appears to be no published study of the use of creatine with GLP-1 medications to help preserve muscle. You may consider discussing with your medical provider if using creatine as part of your weight loss program makes sense for you.
How BeLite Can Help
At BeLite Medical Center, we understand that successful weight loss is a multifaceted journey. Our comprehensive approach combines weight loss medications, personalized exercise plans, and healthy diet strategies. We emphasize the critical role of hydration in weight loss as part of our guidance, helping our clients optimize their health and achieve lasting results. If you’ve been struggling to reach your weight goals, our expert team is here to guide you.
Booking appointments is simple with our online portal available 24/7 at BELITE MEDICAL CENTER | Scheduling and Booking Website. You can also call or text us at (703) 359‑9200, or email belitemed@gmail.com. We offer free consultations for new patients. If you choose not to enroll, there is no charge. We serve patients across Virginia, Maryland, Washington D.C., the DMV area, Pennsylvania, and West Virginia. Patients do not sign treatment contracts and can stop coming at any time.
Key cited sources (all indexed in PubMed)
Medical Disclaimer: This blog post is provided for informational purposes only and does not constitute medical advice, diagnosis, or treatment. It is not intended to substitute for consultation with a licensed healthcare provider. Readers should not use this information to diagnose or treat a medical or health condition without consulting an appropriately qualified healthcare professional. Any reliance on the information in this blog is at the reader’s own risk. Individual weight loss results vary based on personal health status and adherence to medical advice. No doctor-patient relationship is created by accessing or reading this content.
