Creatine in Coffee: What the Trials Found

Quick answer

Trials found no clear problem with creatine and coffee together. In 54 men given 5 g of creatine four times a day, adding 303 mg of caffeine as coffee or as a pill made no significant difference. A 9-man trial from 1996 found caffeine canceled a performance effect, and reviews call the evidence mixed.^1,2,3

Key facts

In a 5-day trial of 54 men, creatine alone, creatine with caffeine and creatine with coffee all gave similar results, and none differed significantly from placebo.¹
A 1996 trial of 9 men found caffeine (5 mg per kg a day) removed a torque gain seen with creatine alone, while muscle phosphocreatine rose by about the same 4 to 6% either way.²
A systematic review of 10 studies found no interference when caffeine came after creatine loading, and mixed results with both taken daily.³
The coffee in the 54-man trial supplied 303 mg of caffeine; NIH puts a cup of coffee at about 85 to 100 mg, so that is roughly three cups.^1,4
No study measured how much creatine hot coffee destroys; the stability data are for water over days.^5,6

Does caffeine cancel out creatine?

Three trials and a systematic review sit at the center of the evidence, with two reviews interpreting them. They disagree in a way that shows why one study should not decide the question.^3,7,8

Trials and reviews of creatine with caffeine^1,2,3,9
Source	Who and how	What it found
Vandenberghe 1996	9 men, 6 days of creatine at 0.5 g per kg a day with or without 5 mg per kg of caffeine	Torque in repeated efforts rose 10 to 23% with creatine alone and did not change with creatine plus caffeine
Doherty 2002	14 men, 6 days of creatine loading, then caffeine 5 mg per kg an hour before a run to exhaustion	Caffeine after loading was followed by a longer run than placebo
Trexler 2016	54 men, 5 g of creatine four times a day for 5 days, with 300 mg of caffeine as a pill or in 8.9 g of coffee	No group differed significantly from placebo; mild stomach discomfort in 4 men on creatine plus caffeine
Elosegui 2022	Systematic review of 10 studies	Caffeine after loading did not interfere; daily use of both showed interference in two studies, none in three and synergy in one

A 2025 expert review sums it up this way: short-term use with under 5 mg per kg a day of caffeine likely does not cause opposing effects, long-term interference is unknown, and daily caffeine during a loading phase does not add to the effect. It also notes that caffeine together with creatine may bring more stomach upset.⁸

The 2015 review calls a pharmacokinetic interaction, one that changes how the body absorbs or clears either substance, unlikely. The explanations it lists are opposite effects on how fast muscle relaxes, and stomach upset from taking both at once.⁷

How much caffeine was in the coffee used in studies?

The coffee arm of the 54-man trial used 8.9 g of coffee yielding 303 mg of caffeine, matched to a 300 mg caffeine pill. NIH's Office of Dietary Supplements puts a cup of coffee at about 85 to 100 mg of caffeine, so 303 mg is roughly three to three and a half cups by our arithmetic. The 1996 trial dosed caffeine by body weight: 5 mg per kg is about 350 mg for a 70 kg person.^1,2,4

A single morning cup is a different exposure from either study. The 2025 review says the effect of daily caffeine on a daily creatine plan has not yet been evaluated.⁸

Does hot coffee destroy creatine?

Creatine powder keeps for years, but dissolved creatine slowly turns into creatinine, faster in warm or acidic drinks. After 3 days at room temperature, 4 to 21 percent was lost, depending on how acidic the liquid was.^10,11

Coffee is acidic: cold brews measured pH 4.81 to 4.92 in one laboratory study, other reports run to about 5.6, and hot brews are more acidic than cold ones. That overlaps the span where creatine in water lost 4% (pH 5.5) to 12% (pH 4.5) over 3 days at 25 °C. Heat speeds the conversion, although it also raises how much dissolves: 45 g per liter at 60 °C against 14 g at 20 °C.^5,6

What nobody has done is measure creatine in a cup of hot coffee. A drink finished in a few minutes spends far less time in solution than the multi-day tests, so the likely loss is small, but that is our reasoning, not a finding. A mug left on a desk for an hour or more moves the situation toward the tested one.⁵

Is creatine in coffee or in water the better choice?

No trial compared the two vehicles for any outcome, so no source can name a winner. Water is the neutral baseline in most designs. The coffee trial found no difference between coffee and a caffeine pill, although the 2015 review notes that studies comparing the two forms disagree.^1,7

Taste is the other half of the question, and no study measured it. The practical trade is solubility against time: warm coffee dissolves more creatine per liter, and coffee that cools in a mug spends longer in a mildly acidic liquid.^5,6

Are there benefits to creatine in coffee?

The studies above tested whether adding caffeine or coffee changes what creatine does. Results ranged from interference in two studies, through no difference in several, to one report of synergy, so no added effect from the combination has been established. What creatine does on its own, at the amounts studied, is set out on the creatine page.^1,3,12

Who should ask a doctor before combining creatine and caffeine?

The creatine cautions apply in coffee as in water, and caffeine adds its own. NIH reports that caffeine intakes of 500 mg a day or more can disturb sleep and cause irritability and anxiety, that FDA states 400 mg a day does not usually have dangerous effects in healthy adults, and that adolescents should limit caffeine to 100 mg a day.^4,12

Ask a doctor or pharmacist first if you take medicines, are pregnant or nursing, are under 18, have kidney disease or a kidney blood test coming up, or already get stomach upset from coffee.^11,12

A small rise in blood creatinine on lab tests, without a change in estimated kidney filtration¹³

Nausea, diarrhea or stomach upset have been reported by some users.¹²

Questions people ask

Is creatine in coffee okay?

In the 54-man trial, creatine with coffee gave results similar to creatine alone, and a 2025 expert review says short-term caffeine under 5 mg per kg a day likely does not oppose creatine. Long-term effects are unknown.^1,8

Is creatine in coffee or water better?

No trial compared them. Water is the baseline; coffee is acidic and hot coffee speeds creatine's conversion to creatinine, though no one measured it in coffee.^5,6

Does hot coffee destroy creatine?

Heat and acidity both raise the rate at which dissolved creatine becomes creatinine, but the tests lasted days, and none used coffee. A cup drunk in minutes spends little time in solution.⁵

What are the benefits of creatine in coffee?

The trials tested whether coffee or caffeine changes creatine's effect. Results ranged from interference to one report of synergy, so no added effect from the combination has been established.^1,3

What does creatine in coffee taste like?

No study measured taste, so no source can answer. Creatine dissolves slowly in cold liquid, which can leave grit, and warmer coffee dissolves more.⁵

Should I drink creatine in coffee if I get stomach upset?

Ask a doctor or pharmacist first. In the trials, a few men reported mild stomach discomfort with creatine plus caffeine, and the 2025 review says the combination may add stomach upset.^1,8

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This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.