Three of you emailed me the same question this month: "Does caffeine cancel out creatine?"
Short answer: no.
A 2022 research review looked at 10 studies on this exact question. 7 out of 10 found zero interference when taken the way runners actually use them.
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The Study That Started the Panic
One study. Nine subjects. Three decades of confusion.
Vandenberghe et al. (1996) found caffeine wiped out creatine's benefit on a leg strength test.
Runners read the headline. The myth stuck.
But look at what they actually tested:
- 9 subjects. Too small to trust.
- 3-week washout. Too short. Creatine needs 4+ weeks to fully clear, so leftover creatine likely skewed the results.
- Caffeine withdrawal. Last dose was 20+ hours before testing. Withdrawal alone could tank performance.
- Leg extensions only. Not running. Not sport-specific.
- Chronic caffeine during loading. They dosed caffeine daily throughout the loading phase. Almost nobody supplements this way.
The protocol they tested isn't how any runner takes these supplements.
(Nine subjects. Fewer people than my last group run.)
Why the Pathways Don't Collide
Caffeine and creatine do interact at the muscle level. But it only matters at doses most runners rarely use.
Darren Candow, one of the most published creatine researchers, explains the mechanism through calcium.
Your muscles contract and relax by shuttling calcium in and out of a storage site.
Caffeine forces calcium out of storage to promote contraction. Creatine helps pump calcium back in for relaxation and recovery.
At high chronic doses, these two pull in opposite directions. A tug-of-war inside your muscle cells. That explains why Vandenberghe's protocol (5 mg/kg caffeine daily during loading) showed interference.
But timing changes everything.
A single pre-exercise caffeine dose peaks in about 60 minutes and fades fast. Creatine operates over hours. By the time creatine is doing its calcium work, caffeine's pull has faded.
Trexler & Smith-Ryan (2015) reviewed how both work in the body: direct interaction is unlikely at standard doses.
The tug-of-war is real. But at normal doses, the two aren't pulling at the same time.
(Two workers using the same machine on different shifts. No conflict.)
10 Studies, One Clear Pattern
Forget one study. Here's what ten show.
Elosegui et al. (2022) reviewed all 10 studies:
| When you take them like this... | How many studies? | What happened? |
|---|---|---|
| Daily creatine + caffeine before exercise | 3/10 | No interference |
| Caffeine alone + creatine alone (single-dose) | 1/10 | Caffeine alone won, but no interference |
| Chronic caffeine during creatine loading | 2/10 | Interference detected |
| Both together, various protocols | 3/10 | No interaction |
| Combined | 1/10 | Synergy |
7 out of 10 studies found no interference. The 2 that did used the same flawed chronic-loading protocol as Vandenberghe.
Fresh endurance data backs this up. Moesgaard et al. (2024) tested 23 endurance-trained athletes (12 men, 11 women):
- Caffeine alone: +12W on a 6-minute time trial
- Creatine alone: improved 15-second sprint performance
- Combined: no interference, no synergy
Each worked through its own pathway. Neither blocked the other.
What to Actually Do on Race Day
Stop overthinking it.
| What | Do This | Why |
|---|---|---|
| Creatine | 5g/day, every day, with carbs | Maintains muscle stores. No loading needed. |
| Caffeine (race day) | 3-6 mg/kg, 30-60 min pre-race | Peak blood levels at gun time |
| Caffeine (training) | Use as you normally do. No need to restrict. | Evidence is mixed on whether daily use reduces race-day benefit |
| Timing gap | Caffeine 45-60 min pre; creatine post or with a separate meal | Minimizes any calcium competition in muscle cells |
| During loading week | Both fine. Ignore the myth. | 7/10 studies, no interference |
Candow's 250mg Threshold
Per Candow, caffeine above roughly 250mg can start to compete with creatine through that calcium tug-of-war. Below that, no blunting.
A typical pre-race dose for a 70kg runner at 3 mg/kg is 210mg. Well under the line.
If you're stacking pre-workout on top of morning coffee, that's where to pay attention.
For reference: I take 5g creatine with breakfast daily and 100-200mg caffeinated gels on race day.
Practical Takeaways
- Caffeine doesn't cancel creatine. The myth comes from one underpowered 1996 study with a protocol nobody uses.
- 7 out of 10 studies show no interference with the way runners actually supplement.
- Take creatine daily (5g). Caffeine before races (3-6 mg/kg). Separate timing if you want to optimize: caffeine pre, creatine post.
- Watch the 250mg caffeine threshold. Below it, no blunting. Above it, you may get muscular-level competition with creatine.
- The only proven interference scenario: chronic high-dose caffeine during a creatine loading phase.
- Combined use may sharpen focus under fatigue (shown in resistance-trained athletes, creatine nitrate form).
Bottom line: Take both. They compete at the cellular level only at doses and protocols most runners will never use.