This is a plain-language summary of what the studies show. It covers what creatine does, what the research says about 10 grams a day, whether timing matters, how safe it looks, and why your weight can jump after you start. It isn't medical advice or a personal recommendation.

Your muscles contract by burning a molecule called ATP, and they store very little of it. They rebuild it constantly, and one of the fastest ways is with phosphocreatine. A phosphocreatine molecule hands a phosphate group to spent ADP to make ATP again. Think of it as a small, quick-access backup battery. It can't power a long effort, but it helps with heavy sets, jumps, sprints, and repeated hard efforts.

Supplementing raises the total creatine in your muscle. In a classic 1996 study of 31 men, 3 grams a day raised muscle creatine by about 20% over 28 days.

The leading explanation for why this helps is practical: with more phosphocreatine available, you may squeeze out slightly more reps or work across a session, and over weeks that extra training adds up. Creatine isn't a hormone and doesn't act like one. It also pulls water into muscle cells, which matters for the scale section below. Whether that cell hydration contributes to actual muscle growth is still uncertain.

Strength and muscle. Across controlled trials, creatine plus resistance training tends to improve strength and lean mass more than training alone, with no clear lean-mass advantage when people don't train. The effect is modest, not dramatic. Results depend on your training, the dose, how long you take it, and how much your muscle creatine actually rises.

One trial shows why "lean mass" numbers need care. In a study of adults on 5 grams a day, the creatine group showed about half a kilogram more DXA lean mass after a one-week wash-in. After 12 weeks of resistance training, both groups had gained about 2 kilograms, with no difference between them. The early gap was mostly water.

Upper and lower body. Both appear to improve. Lower-body lifts show bigger changes in kilograms, but that's partly because leg-press and squat loads are bigger to begin with. Nothing shows the legs respond better biologically.

Older adults. A 2025 meta-analysis of 18 trials in adults 55 and older found about 1.4 kilograms more lean tissue when creatine was added to resistance training, along with better chest-press and leg-press strength. The trials were small and varied, and the benefit shows up most consistently alongside supervised training.

Vegetarians and vegans. They often start with lower muscle creatine, since it comes mainly from meat and fish, so a bigger rise is plausible. But evidence that they gain more strength or muscle than meat-eaters is limited.

Thinking and memory. The evidence for rested, healthy adults is weak. One six-week trial of 123 adults, about half vegetarian, found small effects that didn't reach statistical significance. The more striking results came from small trials in sleep-deprived people using very large single doses, around 28 grams for an 80-kilogram adult, which is not a standard daily protocol.

Recovery. Mixed. A meta-analysis of 13 trials found no consistent improvement in soreness, strength recovery, or range of motion after damaging exercise.

Non-responders. You may have read that 20–30% of people don't respond. That figure traces mostly to a biopsy study of 11 young men, where three saw small increases in muscle creatine. The idea that responses vary from person to person is reasonable. A fixed percentage of non-responders isn't well established.

Probably not, but the evidence is smaller. In one scoping review of muscle-growth trials, only 63 of 456 participants, or 14%, were women. The studies that have included women generally used the same doses as men, and nothing shows women need a different one.

On the other claims:

The standard studied dose is 3–5 grams a day. A short "loading" phase of about 20 grams a day for a week is optional, since it only fills your muscles faster and ends in the same place.

You may have seen studies showing benefits at 10 grams a day or more. They exist, but nearly all of them compared the high dose against placebo, not against 3–5 grams. A benefit versus placebo shows that creatine works. It doesn't show that a bigger dose works better.

Muscle and strength. No trial was found that kept one group at 10 grams or more and another at 3–5 grams for the same number of weeks and measured the results. The closest study followed 25 male college football players averaging about 100 kilograms. One group took 3 grams a day for 10 weeks, one loaded with 20 grams a day for a week and then took 5, and one took placebo. All three groups improved, and the differences between groups weren't statistically significant. The 3-gram group had the numerically largest gains in squat strength and lean mass. That doesn't prove 3 grams is better, since the groups were small. It does show that the higher doses didn't produce an edge, even in large athletes.

Studies at higher doses. A 28-day study of 25 male football players taking about 16 grams a day found more lean mass and more training volume than placebo. A 2026 trial gave 64 sedentary adults aged 45–65 a dose of 10 grams a day, as two 5-gram servings, for 12 weeks. It reported better results than placebo on several measures of lean tissue, strength, and muscular endurance. Neither trial included a group on a lower creatine dose. The 2026 trial also had only 13–20 people per group, many of its outcomes were exploratory, the supplement was supplied by a creatine manufacturer, and a senior author disclosed ties to the creatine industry.

Scaling the dose to body weight. Several studies in older adults used about 0.1 grams per kilogram of body weight a day, which came to roughly 7–9.5 grams for those participants. They found benefits compared with placebo, but none compared that approach with a flat 3–5 grams. A meta-analysis found that both lower and higher dose protocols improved lean mass, and its authors noted that the two approaches weren't directly comparable.

Larger athletes. The ISSN position stand says larger athletes training hard "may need" 5–10 grams a day. That's a reasonable guess, since bigger muscles hold more creatine and turn more of it over each day. It isn't a result from a trial showing that 5 grams fails in bigger people.

The brain. Brain studies often use higher doses, and one 8-week trial tested 2, 4, and 10 grams a day in adolescent girls with depression. The 10-gram group had the biggest rise in a brain creatine marker, 9.1% versus 4.1% at 4 grams. But there were only 7 or 8 people per group, and the difference between doses wasn't statistically significant. That's not enough to say 10 grams helps healthy adults think better. The best-supported cognitive findings come from short trials in sleep-deprived people using single doses of 14–25 grams, which isn't a daily routine.

Safety and tolerance at 10 grams. Ten grams split into two servings looks well tolerated in healthy adults, and the stomach-upset section below explains why splitting matters. In the 2026 trial, blood creatinine rose about 6–8% without exercise and 16–18% with exercise. Calculated kidney function fell, but stayed in the normal range, and the trial didn't use the tests that separate a creatine effect from a kidney problem. If you take 10 grams and get bloodwork, tell your clinician.

Where that leaves 10 grams. It's a legitimate, probably safe dose, and a loading phase or a large body is a reasonable reason someone might use it. What the research doesn't show is that it builds more muscle or strength than 3–5 grams once your muscles are saturated.

Direct comparisons exist, and they're small. Studies of 19 to 34 people, running 4 to 16 weeks, mostly found no meaningful difference between taking creatine before or after training. One four-week study of 19 men leaned toward a small post-workout advantage, but its authors stressed the small sample and short duration.

What the evidence supports is taking it consistently every day, at whatever time is easiest to remember. There's no strong case for a special window.

With food? Taking creatine with a large dose of carbohydrate increased muscle creatine uptake in an early study using high doses. That affects how quickly stores fill, not long-term results, and creatine monohydrate works without the carbohydrate. Taking it with a normal meal may also be easier on the stomach.

In healthy adults, the data is reassuring.

Kidneys. A 2025 systematic review found creatine produced a small rise in blood creatinine but no meaningful drop in actual kidney filtration. A study of 98 college football players found no clinically important differences in blood and urine panels for up to 21 months. Recommended doses haven't been shown to damage healthy kidneys. Very long randomized trials are scarce, so "risk-free indefinitely" would overstate the evidence.

People with reduced kidney function, a single kidney, or kidney problems should talk to their doctor first. Data in established kidney disease is limited.

Blood tests. Creatine breaks down into creatinine, which labs use to estimate kidney function. Supplementing can make creatinine read slightly higher without any change in actual filtration. If you have bloodwork done, tell your clinician you take creatine.

Creatine, creatinine, and creatine kinase. These are different things. Creatine is the nutrient. Creatinine is its breakdown product. Creatine kinase (CK) is an enzyme that doctors measure as a rough marker of muscle strain. Searching "creatine kinase" won't tell you much about the supplement, and hard training raises CK far more than creatine does.

Hair loss. The worry comes from a single small study of 20 rugby players that found DHT, a hormone linked to hair loss, rose after loading. It didn't measure hair loss itself. A 12-week randomized trial in 38 men found no differences in DHT, hair density, or hair thickness at 5 grams a day. The claim isn't supported by current direct evidence, but that trial was short and wasn't built around people prone to hair loss.

Stomach upset. Serving size matters. In a 28-day trial of 59 elite male soccer players, 10 grams taken as a single serving caused diarrhea in 55.6% of players, compared with 28.6% when the same 10 grams was split into two 5-gram servings and 35% on placebo. The split group didn't differ meaningfully from placebo. This is one trial in male athletes, but the pattern is clear enough to act on: keep each serving small. The easiest way to do that is to stick with 3–5 grams a day and skip loading.

Caffeine. One early study found that high-dose caffeine seemed to erase creatine's performance benefit, while later trials found no interaction. This one is unsettled.

Medications. No controlled human trials were found that test creatine against specific drugs, and no well-established serious interaction. Some concerns involving kidney-related medications remain theoretical. If you take medicines handled by the kidneys, ask your doctor or pharmacist.

Which form. Creatine monohydrate is the one with the evidence. Ethyl ester, buffered, and HCl versions haven't beaten it in direct trials, and ethyl ester raised creatinine more and was less effective at raising muscle creatine.

Quality. In the US, the FDA doesn't approve supplements before they're sold. NSF Certified for Sport and Informed Sport test for label accuracy and contaminants. Independent analyses of commercial creatine products found real variation in quality, so third-party certification is worth looking for.

Weight gain is mostly water. A loading phase typically adds about 1–3 kilograms (2.2–6.6 pounds) of body mass, and trials show total body water rising alongside it within days, far too fast to be new muscle protein. At 3–5 grams a day with no loading, the rise is slower and smaller.

Is 10 pounds typical? No. It's well above the average reported in studies, and creatine alone is rarely the most likely cause. Starting creatine at the same time as eating more carbohydrate, more sodium, or more calories can add weight, and so can constipation and normal day-to-day fluctuation. If a gain that large comes with unusual swelling or shortness of breath, see a doctor.

If your weight jumps after starting:

During a cut or recomp. Creatine doesn't create a calorie deficit or add body fat. But early water gain can hide fat loss on the scale, even when your waist measurement is shrinking. Track waist circumference and training performance alongside weight. For how fast real changes happen, see our breakdown of realistic recomposition rates.

Scans. DXA and bioimpedance count water as lean mass, so a body-composition scan taken a week after starting creatine can show "muscle" that is mostly water. If you track composition with a scan, keep hydration, meals, and exercise consistent between scans, and note when you started creatine.

In theory, a gummy works if a full serving delivers about 3–5 grams of intact creatine monohydrate. In practice, fitting that much into a gummy is difficult, and creatine can break down into creatinine in a water-containing food over time.

The testing data is limited and not peer-reviewed. One independent lab project bought 11 products for a one-time test. All five powders matched their labels. Four of six gummies failed, with two containing only trace amounts and two containing none detected. An earlier manufacturer-sponsored test of 12 gummies found six failed their label claims, and there was a dispute about the testing methods. That's a small sample from non-academic sources, so treat it as a warning sign, not market-wide proof. No human trial has compared a gummy to powder.

If you're considering gummies, look for: