Pre-workout gum: what sports science says about caffeine before training

Educational content only — not medical advice. Nothing here is intended to diagnose, treat, cure or prevent any condition. Individual results vary; caffeine isn't suitable for under-18s, or those who are pregnant, breastfeeding or caffeine-sensitive. Check with your doctor if unsure.

The short answer: Pre-workout gum is chewing gum that delivers a measured dose of caffeine — plus, in Avysera's case, L-theanine and B vitamins — through the lining of your mouth so it reaches you within minutes. Sports-science bodies conclude that caffeine reliably supports endurance, strength and power at around 3–6 mg per kg of body mass, and a meta-analysis of caffeinated gum specifically found it improves performance. The gum format mainly makes that dose portable, fast and easy to control.

What is pre-workout gum?

Pre-workout gum is a sugar-free chewing gum you take a few minutes before training instead of a scoop of powder or a cup of coffee. Each piece carries a fixed amount of caffeine, so you always know your dose. Because you chew it, some of the caffeine is absorbed straight through the tissues of the cheek and under the tongue — buccal absorption — rather than waiting on digestion, which is why it can feel quick. For the fuller picture of how the format behaves in the body, see our guide on how fast caffeine gum works.

What sports science says about caffeine before a workout

Caffeine is one of the most studied ergogenic (performance-supporting) aids there is. The International Society of Sports Nutrition's 2021 position stand concludes that caffeine at roughly 3–6 mg per kg of body mass reliably supports muscular endurance, strength, sprinting, jumping and aerobic endurance, with endurance improvements commonly around 2–4%. It also notes caffeine works through several delivery forms — including caffeinated chewing gum — not just capsules and drinks.

For gum specifically, a 2023 systematic review and meta-analysis in the European Journal of Sport Science pooled the trials and found caffeinated chewing gum improved exercise performance. A 2024 systematic review in Nutrients reported that effective doses clustered around 100–300 mg (about 2–4 mg/kg) taken 5–15 minutes before exercise, and a 2025 resistance-training trial found roughly 3 mg/kg of caffeine from gum raised bench-press and back-squat one-rep max by around 5–7%, with no increase in perceived exertion. We go deeper in our pillar on caffeine and exercise.

Why the gum format helps before training

• Fast: the 2024 Nutrients review notes gum can release around 80% of its caffeine within 5–10 minutes through the mouth, so you don't have to dose 45–60 minutes ahead the way you might with a capsule.
• Dose-controlled: one piece is one known amount. No scooping, no guessing, no wondering how strong that coffee was.
• Gentle on the stomach: because some caffeine bypasses first-pass gut and liver metabolism, gum trials tend to report fewer stomach complaints than capsules — useful if you train fasted or dislike a sloshing pre-workout drink.
• Portable and calorie-free: Avysera is sugar-free, zero-calorie and slips easily into a gym bag.

How to time caffeine gum before a session

A practical starting point from the gum literature is to chew a piece about 5–15 minutes before your warm-up, chewing for a few minutes to let it work through the mouth lining. Because Avysera Energy & Focus gum delivers 40 mg of natural caffeine per piece, you can titrate toward the 3–6 mg/kg guideline with the number of pieces that suits your body weight and tolerance — while staying comfortably inside safe limits (more on that below). If you train in the evening, remember caffeine lingers for hours and can disturb sleep.

Pre-workout without the jitters: the L-theanine angle

The wired feeling some people get from strong pre-workouts is part of why Avysera pairs caffeine with L-theanine, an amino acid found in tea. In a 2010 study in Nutritional Neuroscience, a combination of 40 mg caffeine and 97 mg L-theanine improved accuracy on an attention task and increased subjective alertness while reducing tiredness. Each piece of Avysera contains 40 mg caffeine and 60 mg L-theanine — a similar pairing aimed at a smoother, more focused lift rather than a spike-and-crash. There's more in our explainer on the caffeine and L-theanine science, and on the ingredients science page.

How much is safe, and where Avysera fits

The European Food Safety Authority concluded in 2015 that single caffeine doses up to 200 mg, and total daily intakes up to 400 mg, are not a safety concern for most healthy adults. At 40 mg per piece, Avysera makes it easy to stay well within those numbers while still hitting a useful pre-training dose. Two B vitamins round it out: under EU-authorised claims, vitamins B6 and B12 contribute to normal energy-yielding metabolism and to the reduction of tiredness and fatigue. Caffeine isn't for everyone — see the cautions at the top — and it isn't a substitute for sleep, food or the training itself.

Frequently asked questions

Is caffeine gum before a workout as effective as coffee or a pre-workout powder?

The active ingredient — caffeine — is the same, and reviews find gum improves performance much like other forms. The differences are speed, dose precision and typically fewer stomach issues.

How long before training should I chew it?

Most gum studies use about 5–15 minutes before exercise. Chew for a few minutes so the caffeine can absorb through the mouth.

Will it give me jitters?

Any caffeine can, especially at higher doses or in sensitive people. Avysera keeps each piece at a modest 40 mg and adds L-theanine, which research links to a smoother, more focused feel.

Can I use it for every session?

Many people do, within the EFSA daily guidance of 400 mg for healthy adults. Keep an eye on total caffeine from all sources and avoid it late in the day.

Does chewing gum count as breaking a fast?

Avysera is sugar-free and zero-calorie, which many fasting-style trainers prefer, though individual approaches to fasting vary.

Sources

• Guest NS, et al. International society of sports nutrition position stand: caffeine and exercise performance. 2021. Journal of the International Society of Sports Nutrition
• Barreto G, et al. Effects of caffeine chewing gum supplementation on exercise performance: a systematic review and meta-analysis. 2023. European Journal of Sport Science
• Yang W, et al. Effects of caffeinated chewing gum on exercise performance and physiological responses: a systematic review. 2024. Nutrients
• Ding H, et al. Caffeinated chewing gum enhances maximal strength and muscular endurance during bench press and back squat exercises. 2025. Frontiers in Nutrition
• Giesbrecht T, et al. The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness. 2010. Nutritional Neuroscience
• EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on the safety of caffeine. 2015. EFSA Journal