For most people who exercise regularly, creatine is worth taking. It’s one of the most studied supplements in sports nutrition, with decades of consistent evidence showing it increases strength, builds muscle, and may even sharpen certain aspects of brain function. At roughly $0.29 per serving for the standard form, it’s also one of the cheapest.
That said, “worth it” depends on your goals. Here’s what creatine actually does, who benefits most, and what it won’t do for you.
What Creatine Does in Your Body
Your muscles store a compound called phosphocreatine, which acts as an emergency energy reserve. When you do something explosive, like a heavy squat or a sprint, your muscles burn through their primary fuel (ATP) within seconds. Phosphocreatine donates energy to regenerate that fuel almost instantly, letting you push harder for a few more reps or seconds before fatigue sets in.
Supplementing with creatine raises your muscles’ phosphocreatine stores, so you have a larger energy buffer during short, intense efforts. This doesn’t make you stronger on its own. It lets you do slightly more work each session, and that extra work accumulates into greater muscle and strength gains over weeks and months.
Strength and Muscle Gains
A large meta-analysis of adults under 50 found that creatine combined with resistance training produced significantly greater strength gains than training alone. On average, people taking creatine gained an extra 4.4 kg (about 10 pounds) on upper-body lifts and 11.4 kg (about 25 pounds) on lower-body lifts compared to a placebo group doing the same training. Men saw slightly larger upper-body improvements, averaging about 5 kg more than placebo.
These aren’t dramatic overnight changes. They represent the cumulative advantage of training with slightly fuller energy stores, session after session. If you’re already lifting weights consistently, creatine gives you a measurable edge. If you’re not training, it won’t do much for your physique.
The Weight You’ll Gain (and What It Is)
Most people notice the scale jump within the first week or two. This initial weight gain is almost entirely water. Creatine pulls water into muscle cells, and your muscles can temporarily retain up to about 1 liter of extra fluid during a loading phase. This can look like 1 to 2 kg on the scale and sometimes makes muscles appear slightly fuller.
Over the longer term, continued use with resistance training leads to actual muscle growth, which also adds weight. Your waist circumference may stay the same or shrink even as the number on the scale climbs. Creatine does not increase fat mass.
Brain Benefits
Your brain is one of the most energy-hungry organs in your body, and it uses the same phosphocreatine system as your muscles. A systematic review and meta-analysis published in Frontiers in Nutrition found that creatine supplementation produced a small but significant improvement in memory across multiple studies. The researchers rated their confidence in this finding as moderate, meaning it’s reasonably reliable.
Results for attention and processing speed were more mixed. Creatine appeared to improve reaction times on attention tasks in adults aged 18 to 60, particularly those dealing with illness or stress, but didn’t show the same effect in healthy individuals or those over 60. Processing speed improvements showed up primarily in female participants. One mechanism behind these effects: creatine may support the production of neurotransmitters involved in memory and protect brain cells from oxidative stress.
Short-term, high-dose protocols (20 grams per day for 5 days) and longer protocols (6 weeks at standard doses) both showed cognitive effects in individual studies, though more research at larger scale would strengthen these findings.
Benefits for Older Adults
Creatine becomes arguably more valuable with age. Muscle loss accelerates after about 50, and the combination of creatine and resistance training has shown meaningful advantages in older populations. A meta-analysis of over 700 adults aged 57 to 70 found that those taking creatine during resistance training gained roughly 1.4 kg more lean tissue mass than those on placebo. They also saw significantly greater improvements in both upper-body and lower-body strength.
At the cellular level, creatine appears to reduce protein breakdown in muscle tissue and promote the activation of satellite cells, which are the repair units your body uses to maintain and grow muscle fibers. For older adults trying to preserve independence and physical function, this is one of the few supplements with solid evidence behind it.
Safety and the Kidney Concern
The most persistent worry about creatine is kidney damage. This concern stems from the fact that creatine supplementation raises blood levels of creatinine, a waste product that doctors use as a marker for kidney function. Higher creatinine on a blood test can look like your kidneys are struggling, but it’s simply a byproduct of having more creatine in your system.
A particularly telling case study, published in the American Journal of Kidney Diseases, followed a young man with a single kidney who took high-dose creatine for a short period while eating a high-protein diet. His actual kidney filtration rate was unchanged before and after supplementation. His creatinine levels rose slightly, which would have falsely suggested impairment on a standard blood panel, but direct measurement of kidney function showed no decline. Protein in his urine actually decreased.
For people with healthy kidneys, creatine at recommended doses has not been shown to cause kidney problems in any controlled study. If you have existing kidney disease, that’s a different conversation to have with your doctor.
Does Creatine Cause Hair Loss?
This myth traces back to a single 2009 study of college rugby players that found a 56% increase in DHT (a hormone linked to male pattern baldness) after seven days of creatine loading. No study since has been able to replicate that result. Twelve additional studies examined creatine’s effects on testosterone and related hormones, and none reported significant increases. There is no conclusive evidence that creatine raises testosterone or causes hair loss.
How to Take It
Creatine monohydrate is the form to buy. It has the most research behind it, the most consistent results across users, and costs about $0.29 per 5-gram serving. Other forms like creatine HCL dissolve more easily in water and may cause less bloating in sensitive stomachs, but they cost nearly four times as much per serving and don’t offer proven performance advantages.
You have two options for starting:
- Loading phase: 20 to 25 grams per day, split into smaller doses, for 5 to 7 days. This saturates your muscle stores quickly.
- Skip the loading: Take 3 to 5 grams daily from the start. You’ll reach the same saturation point; it just takes about 3 to 4 weeks instead of one.
After your stores are full, 3 to 5 grams per day maintains them.
Timing Doesn’t Matter Much
Multiple studies have compared taking creatine before exercise, after exercise, and at random times throughout the day. The results are consistent: it doesn’t make a meaningful difference. A 12-week study in older adults found identical changes in muscle thickness, strength, and protein breakdown whether creatine was taken before or after training. A 4-week study in younger adults found the same for fat-free mass and bench press strength.
Only one study has ever hinted at a slight advantage for post-workout creatine, and subsequent research failed to confirm it. Take it whenever it’s easiest for you to remember. Consistency matters far more than timing.
Who Benefits Most
Creatine delivers the clearest payoff for people doing resistance training or repeated high-intensity efforts like sprints, intervals, or sport-specific drills. It’s less useful for pure endurance activities like long-distance running or cycling, since those rely on different energy systems.
Vegetarians and vegans often see larger responses to supplementation because they get little to no creatine from food (it’s found mainly in red meat and fish), so their baseline muscle stores tend to be lower. Older adults dealing with age-related muscle loss also stand to gain more than younger, well-trained athletes who may already be closer to their genetic ceiling.
If you lift weights, play a sport, or want to preserve muscle as you age, creatine is one of the few supplements that consistently delivers on its claims at a low cost and with a strong safety record.