Creatine and Caffeine: Does Coffee Cancel Out Your Creatine?

Most mornings, if you take creatine, it goes into the same mug as your coffee, because it will not dissolve properly in cold water and stirring it into something hot solves that in one go.

Creatine and caffeine are safe to take together for healthy adults. Taking caffeine, such as a coffee, about an hour before training once creatine stores are already topped up does not blunt creatine's benefit, and a 2023 review of five such studies found extra performance benefit in three of them. The one scenario with a real signal of interference is high daily caffeine, around 5 milligrams per kilogram of body weight, taken throughout a five to six day creatine loading phase, and the main side effect reported from combining the two is mild stomach discomfort.

"It dissolves in boiling water, like in a coffee, but according to the internet this negates the benefits," one Mumsnet poster wrote in a thread about starting creatine this year, and she is not alone in worrying about it. Clemmie Rose (dipNT, mBANT) read every human trial that tested creatine and caffeine together, from the 1996 Leuven study to a 2024 trial, alongside the two systematic reviews and the ISSN and EFSA positions, and compared the caffeine doses those studies used against a normal UK coffee intake.

Clemmie Rose is a qualified Nutritional Therapist trained at the College of Naturopathic Medicine in King's Cross, holding the dipNT and mBANT post-nominals, and has led nutrition clinics at The Kyros Project with Google DeepMind using biomedical testing to read data rather than headlines. Her own training is strength work, CrossFit and reformer Pilates, which is why the strength-performance literature is where she spends her reading time. She writes on supplements and functional nutrition for Balance Journal.

Creatine monohydrate contains no caffeine. Pre-workouts that combine them list caffeine on the label, so if you are taking plain creatine and drinking your own coffee, you control both doses separately.

This page covers the caffeine question specifically; for the full picture, see our complete guide to creatine. What follows is where the caffeine finding came from, what changed since, and why most of the people in these trials do not drink coffee the way you probably do.

The claim traces to one 1996 study at Leuven, and the result itself was real. Nine healthy men took creatine at 0.5 grams per kilogram of bodyweight a day for six days, some of them alongside caffeine at 5 milligrams per kilogram a day. Muscle phosphocreatine rose 4 to 6 percent in both groups, but dynamic torque, the actual strength output, rose 10 to 23 percent with creatine alone and did not improve with creatine plus caffeine.

A follow-up in 2002 gave a plausible reason why. 10 men took creatine for four days, which shortened muscle relaxation time by about 5 percent, while three days of caffeine lengthened it by about 10 percent in a separate arm of the same study. A single acute dose of caffeine did not produce a significant change either way. The two compounds appear to pull the same lever in opposite directions, and daily caffeine alongside daily creatine loading is where that tug of war showed up as a real result.

That result has never been disproved with the same protocol repeated. Newer trials tested different timing instead, and that context matters more than the headline: daily high caffeine during loading is a narrow and specific case, not the whole story of creatine and caffeine.

The newer trials mostly moved caffeine to a single dose before a training session, taken after loading rather than during it, and that is a meaningfully different test. In 2002, 14 trained men who loaded creatine for six days and then took 5 milligrams per kilogram of caffeine an hour before a treadmill run to exhaustion lasted 222.1 seconds against 198.3 seconds on placebo. In 2011, 12 physically active men who loaded for five days and then took 6 milligrams per kilogram of caffeine produced higher mean and peak power in the first two of six 10-second sprints than creatine with a placebo.

The most-cited "coffee is fine" study is a 2016 trial of 54 physically active men, and it deserves an honest read rather than a headline lift. Over five days of loading at 20 grams a day, one group took creatine alone, one added 300 milligrams of caffeine anhydrous, one added instant coffee giving 303 milligrams of caffeine, and one took a placebo. None of the three creatine groups differed from placebo on strength or sprint performance, which shows coffee did no harm to the creatine effect, not that creatine plus coffee outperformed anything. Four of 13 people in the caffeine anhydrous group reported mild stomach discomfort; nobody in the coffee group did.

Research since then has added detail rather than reversed the picture. A 2024 trial gave 24 healthy men 20 grams of creatine a day for eight days, then tested caffeine before a Wingate sprint test: caffeine raised peak power to 1,033.4 watts against 1,003.3 watts on the placebo trial, and creatine itself added nothing to that number, while the creatine group gained 0.87 kilograms in eight days. A 2022 review of 10 studies concluded that creatine loading does not appear to interfere with an acute dose of caffeine, but chronic caffeine during loading could still interfere, naming the same two mechanisms as the 2002 study. A 2023 review of 10 further studies found caffeine taken about an hour before a session, after loading, added benefit over creatine alone in three of five studies; caffeine taken daily throughout loading added benefit in only one of five.

This is the part missing from almost every other page on this question. The people in the 2016 coffee trial averaged 32.9 milligrams of caffeine a day before the study started, with a range of zero to 214 milligrams, and anyone drinking more than 800 milligrams a day habitually was excluded before enrolment. A single UK coffee shop americano can carry more caffeine than that group's entire daily average.

The 5 milligrams per kilogram dose used in the original 1996 study works out to 375 milligrams for a 75 kilogram adult, roughly four and a half espressos on the EFSA's own guide of 80 milligrams per 60 millilitre shot, or close to four cups of instant coffee at the NHS figure of 100 milligrams a cup. Almost nobody drinks that much coffee before a single session; the interference signal comes from a caffeine dose most habitual drinkers only approach across an entire day, not in the hour before the gym.

Six of the seven trials above recruited men only. The seventh, Pakulak 2022, recruited trained young adults rather than a mixed population, and dosing research specific to women remains thin across the whole creatine for women literature, not just this corner of it. Most trials also ran five to eight days.

Only Pakulak's ran six weeks, and it is the one longer trial where the creatine-alone group showed a rise in knee extensor muscle thickness that the creatine-plus-caffeine group did not, in groups of only six to nine people, on one outcome among several. Small, but it points the same direction as the 1996 finding. Nobody has tested a habitual two-to-three-cup-a-day drinker over months, which is the group asking this question.

Yes, if you drink it within a few minutes. A 2022 analysis found creatine stable for years as a dry powder, but once dissolved it slowly converts into creatinine, a breakdown product, faster at lower pH and higher temperature. At room temperature, roughly 4 percent degrades after three days at pH 5.5, rising to 12 percent at pH 4.5 and 21 percent at pH 3.5. Coffee sits at a pH of 4.85 to 5.13, so the degradation clock is running the moment it goes in.

For a cup you drink promptly, that loss is trivial. The 2016 trial mixed creatine directly into instant coffee, with no difference in outcome against creatine mixed into plain water. What the pH data rules out is a flask of creatine coffee sipped across a morning, or cold brew premixed the night before: over hours rather than minutes, the acidity does real work.

Heat helps the powder dissolve; plain unflavoured best creatine monohydrate is the one to stir in, and the creatine monohydrate vs HCL question matters more for dissolving than caffeine. If coffee is the daily vehicle for a supplement chosen for its purity, the coffee is worth the same scrutiny; what else can end up in your coffee is a fair question too.

For maintenance dosing, at 3 to 5 grams a day, creatine timing is flexible and there is no evidence-based gap you need to leave before drinking coffee. Separate the two only if your stomach objects, in which case take creatine with a meal and have your coffee at a different time.

During a creatine loading phase, five to seven days at a higher dose, the evidence above points to keeping daily caffeine moderate for that one week, or skipping loading and starting at a maintenance dose, which reaches the same saturation point in three to four weeks instead of one. The ISSN position on creatine puts long-term safety at up to 30 grams a day for five years in healthy adults, well above a maintenance dose, and for performance, the ISSN position on caffeine sets 3 to 6 milligrams per kilogram about 60 minutes before exercise as the effective window. If you use a pre-workout containing both compounds, check both doses on the label. When to take creatine in the wider sense is a separate decision with its own evidence base.

Stomach discomfort is the side effect with the clearest evidence behind it. Four of 13 people taking creatine with caffeine anhydrous reported gastrointestinal upset in the 2016 trial, and a 2022 review names gastrointestinal distress as one of two proposed mechanisms behind any interference at all. Nobody in that same trial's coffee group reported the same problem, which suggests the anhydrous dose, not the coffee itself, was doing the irritating.

Sleep is a caffeine question, not a creatine one. Creatine is not a stimulant and contains no caffeine, and no study links creatine itself to disrupted sleep. Caffeine is a different matter: 400 milligrams taken at zero, three or six hours before bed each measurably disrupted sleep in one trial, and the EFSA notes that even 100 milligrams close to bedtime can affect sleep in some adults. If you train in the evening, or want a second cup in the afternoon without paying for it at night, keep the creatine and swap that later cup to good decaf coffee beans instead of cutting the ritual altogether.

On fluid: creatine draws water into muscle, expected and not a sign anything is wrong. There is no evidence that combining it with habitual caffeine dehydrates healthy coffee drinkers. On headache, no study has examined the combination directly, so no consensus. Creatine side effects beyond this combination sit outside the scope of this page.

Two searches recur often enough to need a straight answer. The Parkinson's question traces to a large trial, 1,741 people with early treated Parkinson's disease given 10 grams of creatine a day, stopped early for futility. Within that programme, a separate analysis of 420 participants found higher caffeine intake associated with faster progression, but only among those also taking creatine, and the effect was linked to a specific gene variant.

That is an association inside a trial of people who already had Parkinson's on a therapeutic 10 gram dose, not evidence of risk for a healthy adult on a maintenance dose with a normal coffee habit. Anyone with Parkinson's should raise any supplement with their neurologist first.

The stroke search traces to a single case report from 2000: an ischaemic stroke in a sportsman who had taken creatine monohydrate alongside a MaHuang, or ephedra, extract for bodybuilding. One case report involving a since-restricted stimulant does not establish that creatine plus caffeine causes stroke. Anyone with a heart condition or high blood pressure should still speak to a GP before using a stimulant pre-workout, sound advice regardless of this one case report.