Vandenberghe et al. 1996: Caffeine and Creatine Interaction Study

Study Overview

Citation: Vandenberghe K, Gillis N, Van Leemputte M, Van Hecke P, Vanstapel F, Hespel P. (1996).

Caffeine counteracts the ergogenic action of muscle creatine loading. Journal of Applied Physiology, 80(2), 452-457.

This is the single study responsible for the widespread belief that caffeine and creatine should not be combined.

Despite being published nearly 30 years ago, it remains the only study suggesting a negative interaction — and it has never been replicated.

Study Design and Methods

The study used a double-blind, placebo-controlled design with three groups. Nine healthy male subjects participated.

The protocol involved a 6-day creatine loading phase (0.5g/kg/day) followed by testing of muscle torque during knee extension.

The three conditions tested were creatine alone, creatine plus caffeine (5mg/kg/day), and placebo.

The primary outcome measure was dynamic torque production and muscle relaxation time during intermittent maximal contractions.

Key Findings

What the Study Actually Found

The creatine-only group showed improved muscle relaxation time, while the creatine-plus-caffeine group did not show this improvement.

Critically, the study found that muscle phosphocreatine levels were equally elevated in both creatine groups (with and without caffeine).

This means caffeine did not prevent creatine from loading into muscles — it only appeared to affect one specific performance parameter (Vandenberghe et al., 1996) .

What the Study Did NOT Find

The study did not show that caffeine prevents creatine absorption. It did not show that caffeine reduces muscle creatine stores.

It did not demonstrate that caffeine blocks the primary benefits of creatine supplementation (increased PCr stores and ATP regeneration).

Critical Limitations

1. Never replicated — In over 25 years, no other research group has reproduced these findings
2. Very small sample size — Only 9 subjects total
3. Narrow outcome measure — Only measured muscle relaxation time, not strength, power, or endurance
4. High caffeine dose — 5mg/kg/day is significantly higher than typical consumption
5. Mechanism mismatch — The proposed caffeine interference acts on muscle relaxation, not ATP regeneration (the primary benefit of creatine)
6. Short-duration protocol — Did not assess long-term combined use

Subsequent Research

Multiple studies since 1996 have examined creatine and caffeine together without finding negative interactions.

Trexler and Smith-Ryan (2015) published a thorough review concluding that concerns about the combination were largely unfounded.

Many pre-workout supplements contain both creatine and caffeine, and millions of athletes worldwide use both without issues.

The practical real-world evidence overwhelmingly contradicts the 1996 finding.

Why This Study Matters

Despite its limitations, this study is important to understand because it is the origin of a persistent myth in the fitness and supplement community.

By examining the actual findings and their limitations, athletes and consumers can make informed decisions rather than avoiding a combination that is, by all modern evidence, perfectly safe.

Malaysian Relevance

Malaysia has a strong coffee culture (kopi-O, white coffee, teh tarik) and a growing supplement market.

Malaysian athletes and fitness enthusiasts should know that they do not need to choose between their daily kopi and creatine supplementation.

The science clearly supports using both.

Where This Fits in the Evidence

This is the lone trial behind the “don’t mix caffeine with creatine” advice — and even within it, the wedge is narrow. Phosphocreatine loaded equally with or without caffeine; only one measure, muscle relaxation time, differed in nine subjects. So the study never showed caffeine blocks creatine uptake or its core ATP-regeneration benefit, and across more than 25 years no group has reproduced even the relaxation-time effect. Weighed against the later work collected in our research library and the ISSN position stand, which finds the purported conflict unsupported, the practical conclusion is that combining the two is fine.

Sources and References

• Vandenberghe K, et al. (1996). Caffeine counteracts the ergogenic action of muscle creatine loading. JAP, 80(2), 452-457.
• Kreider RB, et al. (2017). ISSN position stand. JISSN, 14, 18.
• Trexler ET, Smith-Ryan AE. (2015). Creatine and caffeine: Considerations for concurrent supplementation. IJSNEM, 25(6), 607-623.

Further Reading

• creatine dosage guide
• creatine safety profile
• creatine for muscle building
• how creatine works
• creatine loading phase
• buying creatine in Malaysia

Sources & References

Full citations available in our Research Library.