Lauren HollandBy Lauren Holland

Updated November 2026

The short answer: take your first energy gel about 45 to 60 minutes into a run that will last longer than 60 to 75 minutes, then repeat every 30 to 45 minutes. Always take it with water, and practice the exact timing on your long training runs before race day.

That schedule is a starting point, not a rule. The right moment to take energy gels running depends on your pace, your body weight, the heat, how well you ate beforehand, and how your gut handles carbohydrate. Below is how to work out your own timing.

Shopping for one? See our guide: 6 Best How Oftens to Take Energy Gels When Running (2026): Our Picks.

Why timing matters for energy gels

Your body stores carbohydrate as glycogen in your muscles and liver. For most runners, that supply is enough for roughly 90 minutes of hard effort, though it varies a lot from person to person. Once those stores run low, pace drops and fatigue sets in quickly, often called hitting the wall. Gels are a concentrated, fast-digesting carbohydrate source, so taking them before your stores run low helps you keep your effort steady.

Taking a gel too late is the common mistake. By the time you feel flat, you are already behind, and it can take a while for the carbohydrate to reach your working muscles. Taking one too early, or stacking several in a short window, is the other mistake, and it usually leads to nausea, cramping or a sloshing stomach.

Factors that change your timing

Several variables shift the schedule for each runner:

  • Pace and intensity. Faster running burns carbohydrate at a higher rate, so you need to start fueling sooner. A relaxed long run can go longer before your first gel.
  • Body size and fitness. Larger athletes and those with more training volume generally burn more carbohydrate per hour.
  • Heat and humidity. Hot conditions raise fuel use and sweat loss. Many runners start earlier and may need a little more fluid with each gel.
  • Pre-run meal. If you ate a substantial carbohydrate-rich breakfast two to three hours before the start, your stores are fuller and the first gel can wait a bit longer.
  • Gut tolerance. Some runners tolerate gels well from the start. Others need to build tolerance gradually over several long runs.

For most people, a useful baseline in training is 30 to 60 grams of carbohydrate per hour once fueling begins. Check the label on your gel, since many single-serving packets contain about 20 to 25 grams of carbohydrate, so one gel every 30 to 45 minutes lands in that range.

How to dial in your own gel schedule

Treat your long runs as practice sessions. The goal is to find the timing and dose that keeps your energy steady and your stomach calm.

  1. Start with a first gel at about 45 minutes on runs over 75 minutes, then repeat every 30 to 40 minutes.
  2. Take each gel with 4 to 6 ounces of water unless the packet says otherwise. Gels are thick, and dry swallowing can upset your stomach.
  3. Note your pace, how you felt at each stop, and any GI issues. Write it down after each long run.
  4. If you get nausea, space gels out a little more or try a different flavor or brand.
  5. Rehearse the exact plan at least two or three times before race day, ideally with the same gels and the same breakfast.

For races, a common pattern is to take a gel near the start of the race if it is a half marathon or longer, then continue at set intervals through the midpoint and beyond. In a marathon, most runners take their first gel somewhere in the 45 to 60 minute range and keep a steady rhythm from there. Many runners also use the aid stations for water, so plan to take each gel just after you pass water, not ahead of it.

Practical tips for taking gels on the run

  • Open the packet before your run, or set it in an easy-to-grab pocket. Fumbling with a sticky gel at mile 15 is frustrating.
  • Squeeze the gel into your mouth in small amounts rather than all at once.
  • Do not take a gel in the last few minutes before a hard effort or sprint finish.
  • If you feel stomach discomfort, slow your pace briefly and sip water rather than forcing another gel.
  • Store gels at moderate temperatures so they stay easy to squeeze. Heat can soften them into a mess.

What we’d use

Choose a gel with a consistent carbohydrate dose, a flavor you enjoy on long runs, and packaging that opens easily while moving. Several widely available options are worth comparing.

  • SiS GO Isotonic Energy Gel is a popular option for runners who want a gel designed to be taken with water. View on Amazon
  • GU Energy Original Sports Nutrition Energy Gel is a long-running favorite with a familiar texture and a range of flavors. View on Amazon
  • Clif Shot Energy Gel offers a straightforward carbohydrate-focused gel that many runners use in training and racing. View on Amazon

Whatever you choose, test it on a long run before race day. Your stomach is the final judge.

For more detail on product options and timing, see Energy Gels Before Running: When to Take Them and How Much and When to Take Energy Gels: A Marathoner's Timing Guide. If you are racing a shorter distance, When to Take Energy Gels During Half Marathon: A Step-by-Step Timing Guide covers the adjustments.

Should I take an energy gel before a run?

For most runs under 60 minutes, you do not need a gel. A balanced meal two to three hours before the start is enough. Some runners take a gel 15 to 20 minutes before a race, but test this in training first.

How many energy gels should I take in a marathon?

Many marathoners take between four and six gels across the full distance, depending on pace and fueling plan. Your exact number depends on how many carbohydrates each gel provides and your personal target per hour.

Can I take energy gels without water?

Some gels are designed to be taken alone, but most runners find it easier and gentler on the stomach to take them with water. Read the packet and test your approach on long runs.

What if an energy gel upsets my stomach?

Try spacing gels further apart, reducing the amount per dose, or switching brands. Persistent or severe stomach problems warrant a conversation with a doctor or sports dietitian.

Do I need energy gels for a 10K?

Most 10K races are short enough that gels are unnecessary for healthy runners who ate a normal breakfast. Gels become more important as distance and duration increase.

Ready to choose one?

Lauren Holland

About Lauren Holland

Lauren Holland is part of our editorial team and reviews and edits our marathon & half-marathon guides, checking product details against manufacturer specifications and owner feedback.