Creatine & Caffeine: Can You Take Them Together?

Can you take creatine and caffeine together?

Yes. For most people, taking creatine and caffeine on the same day, or in the same drink, is safe and does not appear to reduce the benefit of either. The idea that the two cancel each other out comes from a single small study published in 1996 that used very high doses of both, and the finding has rarely been reproduced since. If you take creatine daily and drink coffee or use a pre-workout, current evidence does not give you a reason to separate them.

Where did the idea that caffeine cancels creatine come from?

One study, published in the Journal of Applied Physiology in 1996.

Belgian researchers gave nine healthy men creatine at 0.5 g per kilogram of body weight per day for six days, either alone or alongside caffeine at 5 mg per kilogram per day. Muscle phosphocreatine (the stored form of creatine your muscles use to rapidly regenerate energy during short, hard efforts) rose by a similar amount in both groups. But dynamic knee-extension torque improved by 10 to 23 per cent with creatine alone, and did not improve at all when caffeine was added. The authors concluded that caffeine counteracted the ergogenic effect of creatine loading.

That is a real result, and it was taken seriously. It is also worth reading the fine print.

The creatine dose was around 40 g a day for an 80 kg person, roughly eight times the standard daily maintenance dose used today. The caffeine dose worked out to about 400 mg a day for the same person, taken every day for six days, not as a one-off pre-workout hit. Nine men were tested on an isokinetic dynamometer, a machine that measures torque at a fixed speed, which bears little resemblance to how most people actually train.

Has that finding been replicated?

Largely, no.

A 2015 review in the International Journal of Sport Nutrition and Exercise Metabolism examined the proposed mechanisms behind a creatine and caffeine interaction and found that, while the theory was plausible, the evidence supporting a meaningful impairment at normal supplement doses was scarce.

A 2022 systematic review in the same journal pooled ten studies and reached a more specific conclusion. Creatine loading did not interfere with the acute performance benefit of a single pre-exercise caffeine dose. Where a signal did appear, it was in the reverse direction and only under one narrow condition: chronic daily caffeine taken throughout a creatine loading phase, which the reviewers flagged as potentially interfering with creatine's benefit. Of the studies reviewed, two reported interference, three reported no interaction at all, and one reported synergy.

What does the most detailed review say about timing?

A 2023 systematic review in Critical Reviews in Food Science and Nutrition split the evidence by protocol, which is the most useful way to read it.

In five studies where caffeine (5 to 7 mg per kg) was taken roughly one hour before a performance trial following a five to six day creatine loading phase, three found the combination outperformed creatine alone. In five studies where caffeine was taken daily throughout the loading phase, only one found an additional benefit.

The pattern is consistent across both reviews. Caffeine used the way most people actually use it, as an acute pre-training dose, sits comfortably alongside creatine. The weak signal for interference is tied specifically to high daily caffeine during an aggressive loading protocol.

Why do the two get talked about as opposites?

Because of muscle relaxation time. A 2002 follow-up from the same Belgian research group found that creatine shortens the time a muscle takes to relax after contracting, while caffeine lengthens it. That is a genuine opposing effect at the cellular level, and it is the most cited mechanism for the theory.

What it does not establish is that the two cancel out in practice. A mechanism that works in one direction on a single variable does not automatically translate to a loss of strength, power or lean mass, and the performance studies have not consistently shown one.

Does caffeine stop creatine being absorbed?

No. This is the most common version of the myth and the easiest one to set aside.

The 2025 ISSN review on creatine supplementation notes that the independent pharmacokinetic properties of creatine and caffeine do not appear to be altered when the two are taken together, and that early research found creatine administered in a caffeinated beverage significantly increased muscle creatine content.

Absorption was never the proposed mechanism. Creatine is absorbed in the small intestine and taken up into muscle by a dedicated transporter. Caffeine does not compete for that pathway.

Does it matter whether you load creatine?

It matters more than the caffeine question does.

The interference signal, where it appears at all, shows up almost exclusively in loading protocols using 0.3 to 0.5 g per kg per day. If you are not loading, the narrow condition under which the concern exists does not apply to you.

And most people do not need to load. The International Society of Sports Nutrition's 2021 review concluded that a daily dose of 3 to 5 g, or 0.1 g per kg of body mass, is effective for increasing intramuscular creatine stores, muscle accretion and performance, and is well tolerated at those amounts. Loading fills the muscle faster, over five to seven days rather than three to four weeks, but the end point is the same.

True Protein's Creatine Monohydrate delivers 3 g of creatine monohydrate per serve, unflavoured. It is packed at our facility in Brookvale on Sydney's Northern Beaches. For those who want the German sourced Creapure, we have that available too: Creapure Creatine Monohydrate.

Should you put creatine in your coffee?

You can, with one practical caveat.

Creatine is stable as a dry powder but slowly converts to creatinine (an inactive breakdown product your kidneys clear) once it is dissolved, and that conversion speeds up in hot, acidic liquid. A coffee you drink within a few minutes of stirring creatine through it is fine. A thermos you sip over three hours is a less reliable delivery method.

Two other things worth knowing:

• Creatine monohydrate is unflavoured but not entirely tasteless in hot liquid. Some people notice a faint chalkiness in black coffee that disappears in milk-based drinks.
• Dissolving creatine in a larger volume of liquid generally improves how it goes down. Grittiness is a mixing problem, not a quality problem.

Is there any real downside to taking them together?

Two, and neither is about performance.

Gastrointestinal discomfort. This is the most consistently reported issue when creatine and caffeine are taken together, and it is dose-driven rather than interaction-driven. Large creatine doses in one sitting and high-stimulant pre-workouts both upset stomachs on their own. Combined on an empty stomach before training, the odds increase. Splitting creatine into a smaller dose taken with food solves it for most people.

Sleep. Creatine has no effect on sleep. Caffeine has a substantial one, with a half-life of roughly five hours in most adults, meaning a 200 mg afternoon coffee still has around 100 mg circulating five hours later. If you train in the evening and take a caffeinated pre-workout with your creatine, the caffeine is the variable worth managing, not the creatine.

If you are subject to anti-doping testing, choose batch-tested products. In Australia, look for HASTA certification, which tests Australian sports supplements for banned substances, and check the current Sport Integrity Australia guidance on supplement use.

How should you actually structure it?

The single biggest determinant of whether creatine works is consistency, not timing. A daily serve taken at whatever time you will reliably remember beats a perfectly timed dose you forget three times a week.

Many people take creatine with their post-training shake for exactly that reason, since it attaches the habit to something already in the routine. True Protein's WPI90 is a whey protein isolate delivering 27 g of protein per 30 g serve with minimal lactose and fat, and creatine mixes into it without affecting the taste.