Pre-Race Nutrition for 10K, Half Marathon and Marathon Day

Race-morning nutrition gets talked about as if it's one thing, but what actually matters changes a lot depending on the distance you're racing. A 10K is largely decided by how sharp and well-fuelled you feel in the first two kilometres; a marathon is decided as much by what you did in the two hours before the start as by anything in the race itself. Here's how the approach differs across the three most common race distances.

10K: focus on feeling sharp, not on fuelling for distance

A 10K is short enough that fuelling mid-race isn't really the issue — what matters is arriving at the start line alert, warmed up, and without anything sitting heavily in your stomach. A moderate, measured caffeine dose (commonly around 100mg) taken 30–45 minutes before the gun is a well-established way to support alertness and reduce perceived effort over a short, intense effort like a 10K, without the crash that comes from overdoing stimulants.

Half marathon: bridging fast and fuelled

At half marathon distance you're managing both ends of the problem — you still want the sharpness that matters for a 10K, but you're now racing for long enough that blood flow and sustained muscular endurance start to matter too. This is where Citrulline Malate earns its place: commonly dosed around 3,000mg, it supports nitric oxide production and blood flow, which becomes more relevant as effort duration stretches past an hour.

Marathon: performance and joint resilience together

Marathon day compounds everything above and adds one more factor: by the closing miles, the repetitive impact of the distance itself is a bigger variable than it is at any shorter race. This is why marathon-specific routines tend to combine pre-race performance support (Citrulline Malate and caffeine) with joint support taken consistently through the training block rather than only on race day — the goal isn't just to start well, but to hold form over the full distance.

Building your race-morning routine

Whatever the distance, the principle is the same: decide what you actually need — alertness, blood flow, or both — and dose deliberately rather than reaching for a generic pre-workout built for a gym session. RunnerVits' Pre-Race Performance (3,000mg Citrulline Malate, 100mg caffeine) is formulated specifically for this brief, vegan-friendly, and independently Cologne List® tested for banned substances — take it 30–45 minutes before the start, and pair it with Runner Joint Support through training if you're building toward a half marathon or marathon.