Creatine: Benefits, What It's Good For and the Evidence

Creatine is one of the most studied supplements in the world, and the short answer is this: combined with resistance training, it increases strength and supports muscle mass gains in adults. In a meta-analysis of 23 studies in adults under 50, creatine supplementation with resistance training increased upper-body strength by around 4.43 kg and lower-body strength by around 11.35 kg, compared with placebo ¹.

But "benefits" does not mean "for everyone" or "for everything". Effects outside sport are more modest and sometimes contradictory, and if you don't train for strength you are unlikely to notice a difference. This article explains what the evidence supports, what is still uncertain, and how to fit creatine into a real routine.

What creatine is and how it works in muscle

Creatine is a compound your body produces from amino acids, and you also get it from meat and fish. In muscle, it takes part in the phosphagen system: it helps regenerate ATP quickly, the molecule that supplies energy for contractions. That is why its role is more visible in short, intense efforts — sprints, jumps, heavy sets — than in prolonged effort. If you want the mechanism in detail, we have a dedicated article on how creatine works.

The most studied form is creatine monohydrate. It is not a stimulant and does not act on the nervous system like caffeine: the effect is cumulative, as muscle creatine stores rise over days or weeks.

Which benefits are well documented?

The most consistent effect is performance in high-intensity, short-duration exercise, especially when combined with resistance training. The meta-analysis in adults under 50 found significant strength gains in both the upper and lower body compared with placebo ¹.

For body composition, a meta-analysis of 12 studies in adults under 50 assessed the additional effect of creatine on changes induced by resistance training and found benefits, though modest in magnitude, for lean body mass ². Another meta-analysis, with 10 studies and direct measures of hypertrophy (MRI, CT or ultrasound), found a small but favourable effect of creatine combined with resistance training on muscle thickness in the upper and lower body, in the order of 0.10 to 0.16 cm ³.

In other words: the gains are real, but modest. None of these studies suggests dramatic transformations, and variability between people is large — those who already have high muscle creatine stores tend to respond less.

Does creatine help endurance, like running or cycling?

Here the evidence is less favourable. A meta-analysis of 13 studies in a trained population assessed the effect of creatine monohydrate on endurance performance and found no significant change in the pooled outcome ⁴. This does not mean creatine is useless for runners or cyclists — it may help with explosive efforts within those sports — but it is not an endurance supplement in the classic sense.

What about the brain? Memory, cognition and mental fatigue

This is the area with the most enthusiasm and the least certainty. A meta-analysis of randomised controlled trials in healthy people found an overall improvement in memory measures with creatine compared with placebo, but the effect was mainly visible in older adults (66–76 years); in younger people (11–31 years) the difference was not significant ⁵.

A systematic review of trials in healthy people concluded that short-term memory and reasoning may benefit, but results in other domains — attention, executive function, reaction time, mental fatigue — were contradictory, and performance in young people remained unchanged ⁶. The largest randomised controlled trial on the topic, with 123 participants and 5 g per day for 6 weeks, found only a small effect, at the limit of statistical significance, and no improvement in exploratory cognitive tasks ⁷.

In summary: there is a signal, but it is small and does not allow promises of memory or focus improvements in healthy people who sleep and eat well.

Who may benefit most — and who probably won't

• Those who train strength or power regularly: weight training, CrossFit, football, basketball, sprints, jumps. The evidence is strongest for strength gains in adults under 50 who combine creatine with resistance training ¹.
• Older adults who train: the memory evidence is clearer in this age group ⁵. Maintaining strength and muscle mass is relevant with age, but the studies on this page did not specifically assess that effect in this age group.
• Those doing continuous aerobic exercise: the meta-analysis in a trained population found no significant effect on endurance performance, although it did not specifically assess this subgroup ⁴.
• Those who don't train: without a training stimulus, creatine does not build muscle or improve fitness on its own.

If your goal is general health rather than performance, it may not be the most important supplement — but it is also not, for most healthy adults, a safety problem.

If you have diagnosed kidney disease, don't start without talking to your doctor: creatine increases the creatinine load the kidneys have to process, and it is prudent to assess the individual case. The same applies if you take medicines regularly or have a diagnosed health condition.

Doses used in studies and what the label says

In trials, the most common doses are between 3 and 5 g per day, often without a loading phase; the largest cognitive trial used 5 g daily for 6 weeks ⁷. These doses are research references, not instructions for use.

TuttiBear's Creatine Gummies provide 5000 mg (5 g) of creatine monohydrate per serving of 3 gummies, plus 50 µg of vitamin B12 (2000% NRV). The directions on the label are to chew 3 gummies per day, preferably after a meal, without exceeding the recommended daily dose. The daily dose of 5 g is within the range of doses used in some trials (3–5 g), but that does not turn the product into a treatment or guarantee individual results.

TuttiBear's gummies contain polyols (maltitol), so excessive consumption may have a laxative effect; the label recommends not exceeding the stated daily dose and keeping the product out of reach of young children. As with any supplement, they do not replace a varied and balanced diet or a healthy lifestyle.

To go deeper into the question of amount and timing, see creatine daily dose and when to take creatine.

Gummies, powder or tablets: what changes in practice

There are no trials that directly compare gummies with powder or tablets in terms of results. What is known is that creatine monohydrate is the most studied form and that the total daily dose is the determining factor — not the format. The differences between formats are practical: powder dissolves in water, tablets are easy to carry, and gummies need no liquid and taste pleasant, but usually require several units per day to reach the intended dose.

If convenience is decisive for keeping up the routine, gummies are a valid option; if cost per gram is the criterion, powder tends to be cheaper. We have a more detailed comparison in creatine gummies or tablets.

Safety and the kidney myth

The concern about kidneys is old and deserves nuance. A meta-analysis of 21 studies (12 included in the quantitative analysis, with 177 participants in the creatine group and 263 in the control group) found a small but statistically significant increase in serum creatinine, especially in studies with follow-up of one week or less; in longer follow-ups the effect was not significant ⁸. This is relevant because creatine can raise serum creatinine without that meaning kidney damage — it is a marker that can be affected by supplementation itself.

An earlier meta-analysis, with 15 studies in the qualitative analysis and 6 in the quantitative one, found no significant change in serum creatinine or plasma urea at the doses and durations studied ⁹. The position of the International Society of Sports Nutrition considers creatine safe in the short and long term at the doses usually studied in healthy people ¹⁰.

Even so, if you have diagnosed kidney disease, take medicines or have a health condition, talk to a health professional before starting — and see our article on creatine and medicines.

What creatine does not do

It is not a stimulant pre-workout: it contains no caffeine and does not cause a "rush". It does not replace training or diet. It does not prevent, treat or cure diseases, and claims about neurodegenerative diseases, brain injury or depression remain the subject of preliminary research, without conclusions applicable to healthy people ¹¹. It is also not a general health supplement equivalent to vitamin D3 or omega-3, which have distinct nutritional roles.

How to decide whether it is worth it for you

Ask three questions: do I train strength or power consistently? Do I have realistic expectations (modest gains over weeks)? Am I willing to keep taking it daily? If you answered yes to all three, creatine is a reasonable tool. If you mainly train continuous endurance or don't train, the likely benefit is small.

If you are under 18, pregnant or breastfeeding, or have a health condition, talk to a health professional first. To explore the range, see Training and Performance or the Packs available.

If you want to understand better what the research says about safety before deciding, see does creatine harm you? What the evidence says about safety.

Frequently asked questions

Does creatine help you build muscle?

Creatine combined with resistance training supports modest gains in lean mass and muscle thickness, according to meta-analyses in adults under 50. The effect is small and depends on training, diet and consistency over weeks. Without resistance training, creatine alone does not build muscle.

Does creatine improve memory or concentration?

There is some signal, but it is small. One meta-analysis found memory improvement mainly in older adults, and not in younger people. The largest randomised trial on cognition found only a small effect, at the limit of significance. It is not possible to promise memory improvements in healthy people.

Is creatine bad for your kidneys?

At the doses and durations studied in healthy people, the evidence does not show kidney damage. Creatine can slightly raise serum creatinine, especially over short periods, which can confuse blood tests. Anyone with kidney disease should talk to a health professional before taking it.

How long does it take to work?

The effects are cumulative and depend on raising muscle creatine stores, which takes days to weeks. In trials, supplementation periods typically range from 4 to 12 weeks. Don't expect to feel anything on the first day.

Are creatine gummies as effective as powder?

There are no trials that directly compare gummies with powder. What matters is the total daily dose of creatine monohydrate, the most studied form. Gummies are mainly a question of convenience and taste; check the label for how many milligrams each serving provides.

Who should not take creatine?

People under 18, pregnant women, breastfeeding women and people with kidney disease or other health conditions should talk to a health professional before considering creatine. Those who don't train strength or power are unlikely to get a relevant benefit.