You have been taking creatine and caffeine together for months. The scoop in your water, the coffee before the gym, maybe a pre-workout that contains both. Then someone told you the caffeine cancels out the creatine.
The claim shows up everywhere with the certainty of settled science — supplement forums, fitness influencers, hedged articles suggesting you separate them by a few hours just to be safe. None of it traces back to anything specific, and the sheer volume of repetition is what makes it feel true.
Does Caffeine Cancel Out Creatine?
For the way most people supplement — daily creatine, caffeine before workouts — a systematic review of ten studies found no evidence that caffeine cancels creatine’s benefit. Three of four acute-protocol studies showed zero interference. The myth originates from a single 1996 study using extreme doses no recreational user would follow.
— Elosegui et al. 2022 · Int J Sport Nutr Exerc Metab · 10 studies reviewed
Whether caffeine and creatine interfere has been tested directly in ten controlled studies. A 2022 systematic review sorted them all by protocol, and for the way most people actually supplement — daily creatine, caffeine before training — three out of four studies found no interference. The caffeine did not weaken the creatine. The creatine did not blunt the caffeine.
For people who take both at high doses every single day over extended periods, the evidence is less tidy. Two of six chronic co-supplementation studies found caffeine interfered with creatine’s benefit. Three found nothing. One found the combination actually performed better than either supplement alone. The balance leans against cancellation even under chronic dosing, and for the acute protocol most people follow, it is not close.
A single study from 1996 started the entire fear. A small group of participants took extreme doses of both supplements — far beyond what anyone takes with their morning coffee or pre-workout — and caffeine counteracted creatine’s effect on one specific measure of muscle force. That one finding, from one extreme protocol, traveled across forums and fitness media for three decades until it sounded like consensus.
A single extreme-dose study became thirty years of certainty — because nobody checked the dose.
Separately, both supplements have been tested more extensively than almost anything else in sports nutrition. Caffeine improves strength and power output consistently, with zero variation between studies in how large the benefit was. Creatine adds lean mass across more than a hundred randomized trials, backed by the kind of evidence quality that almost no other supplement matches. Both earned their reputation before the cancellation myth existed, and neither lost it when the myth was actually tested.
What shifts is the question. Whether caffeine cancels creatine is settled. Whether everything else on your supplement shelf has earned the same confidence is a shorter list than the marketing suggests.