A faster kick for your mental and physical performance
- Kicks in 3x faster than coffee, caffeine pills, energy drinks and gels
- Made in the UK
- Only 27 calories a chew, ideal for fasted training
Free UK delivery on every order. 40 individually wrapped chews a bag.
What are you looking to achieve?
Tap one to see your range
Caffeine Bullet: built for sport
Chewing caffeine absorbs it through your mouth, straight into the bloodstream, so it kicks in around 5 minutes. Mint 100mg or Chocolate Orange 85mg.
Brain Bullet: calm, relaxed focus
Caffeine for alertness, L-theanine from green tea to smooth the ride. Scientifically dosed 2:1 L-theanine to caffeine, for steady focus without the jitters.
Tastes as good as your performances
Best seller
Cool spearmint that wakes your mouth up before the caffeine wakes the rest of you. The kick of a strong coffee, with no cup.
Smooth dark chocolate with a bright twist of orange zest. Made from real cocoa, and a slightly gentler 85mg.
80 chews, Mint and Chocolate Orange. Save £3.91.
Best seller
A caramel frappe in a chew: British caramel, French vanilla and Colombian coffee. The desk-drawer replacement for your third coffee.
Finely ground matcha with refreshing British peppermint. Light, clean and the one to keep by the laptop.
80 chews, Coffee Caramel and Mint Matcha. Save £3.91.
Subscribe and save 20% on any flavour: delivered every 4 weeks with free UK delivery. Change the gap, skip, pause or cancel any time from your account.
One chew for optimal performance
100mg in one 27-calorie chew. Here is what it takes to get the same caffeine elsewhere, using each brand's own figures.
| Product | One serving | Caffeine | To match one Bullet (100mg) | Calories at 100mg |
|---|---|---|---|---|
| Caffeine Bullet Mint | 1 chew, 27 calories | 100mg | 1 chew | 27 |
| Ruly energy gummies | 1 pack, 28 gummies, 42g | 80mg | 1¼ packs, 35 gummies | not published |
| Clif Shot Bloks Black Cherry | 1 packet, 6 bloks, 60g | 100mg50mg per 3 bloks | 1 packet, 6 bloks | 200 |
| GU Energy Gel | 1 gel, 32g | 20mg40mg in 4 flavours | 5 gels (2½ of the 40mg) | 500 (250) |
| Skratch Labs Energy Chews Sour Cherry | 1 pack, 50g | 50mg | 2 packs | 320 |
| Jelly Belly Extreme Sport Beans | 1 pack, 28g | 50mg | 2 packs | 200 |
Caffeine and calorie figures taken from each brand's own product page on 4 November 2026: Clif Bloks Black Cherry with Caffeine (50mg per 3-blok serving, 2 servings a packet); GU Original Energy Gel (20mg in most caffeinated flavours, 40mg in Espresso Love, Jet Blackberry, Cola Me Happy and Caramel Macchiato); Skratch Labs Energy Chews Sport Fuel Sour Cherry + Caffeine (50mg a pack); Jelly Belly Extreme Sport Beans (50mg a 28g pack); Ruly Berry energy gummies (80mg a 42g pack). Brand names belong to their owners. Recipes change, so check the pack.
When to take it, sport by sport
Chewed caffeine kicks in around 5 minutes and peaks around 40, so you time it to the moment you would normally fade, not an hour before the gun.
Before: 1 chew, 15 minutes before you start.
Longer session? Save it for when the sets get hard.
Before: 1 chew, 5 to 10 minutes out.
During: nothing. It is over before the caffeine peaks.
Before: 1 chew, 15 minutes before the first rep.
During: 1 before the last reps if the session runs past an hour.
Before: 1 chew on the start line.
Chasing a PB? 1 chew 15 to 20 minutes out, another 5 minutes before the gun.
Before: 1 chew, 15 minutes before.
During: 1 at halfway if you feel it fading.
Before: none, or 1 if you like a lift at the start.
During: 1 at mile 7, 1 at mile 10.
Before: none. Early caffeine wears off before you need it.
During: 1 to 2 at miles 16 to 18, 1 to 2 more at miles 20 to 22.
Before: none.
During: 1 every 60 to 90 minutes from the point you start to fade. Count them: 400mg a day.
Before: 1 chew, 15 minutes before kick-off.
During: 1 five minutes before half time.
One chew is 100mg (Mint) or 85mg (Chocolate Orange). Keep to 400mg of caffeine a day from all sources, and try it in training before you race on it. Full guide: how to use Caffeine Bullets.
Personal bests, in their words
Why caffeine with L-theanine?
Caffeine on its own makes you alert but can leave you twitchy and scattered. L-theanine, an amino acid found in green tea, smooths that edge: in peer-reviewed trials since 2008 the pair improved attention, reaction time and accuracy more than caffeine alone.
- 80mg caffeine: about a cup of coffee, measured precisely.
- 160mg L-theanine: a scientifically dosed 2:1 L-theanine to caffeine ratio.
- Kicks in around 5 minutes, because absorption starts in the mouth.
- 27 calories, no artificial flavours, sweeteners, colours or preservatives.
Trusted by professionals who need to stay sharp for hours, including the team behind The Diary of a CEO.
Made by athletes, for athletes
Hey, I'm David, the Boss Bullet. I've raced around the world from Afghanistan to Myanmar, and when I dropped my caffeine tablet in the Sahara mid-race, I created Caffeine Bullet: a chew that absorbs caffeine directly into the bloodstream for a faster kick.
- Over 9 million Caffeine Bullets sold to date.
- Started with an athlete community-led Kickstarter, then backed by Steven Bartlett and Peter Jones on Dragons' Den.
- Editor's Choice for race nutrition, Women's Running Awards 2020 and 2022.
- Ten years interviewing the world's best athletes and sports scientists on the Bad Boy Running podcast.
Because life is a performance
Hey, I'm David, the Boss Bullet. I created Caffeine Bullet after dropping my caffeine tablet in the Sahara mid-race. At my desk I wanted the mental clarity without the physical buzz, so we researched the studies and found L-theanine gives you the best of both worlds.
- Over 9 million Caffeine Bullets sold to date.
- Backed by Steven Bartlett and Peter Jones on Dragons' Den.
- Scientifically dosed 2:1 L-theanine to caffeine.
- Made in a traditional sweet factory from a 30-year-old family recipe.
Your questions, answered
Which Bullet will help me most?
For training, racing or the gym, pick Caffeine Bullet (Mint 100mg or Chocolate Orange 85mg). For work, study or long days where you want calm, steady focus, pick Brain Bullet (80mg caffeine with 160mg L-theanine). Not sure? Start with a 4-packet trial of each.
Is it a gum or a gummy?
Neither. A Caffeine Bullet is a soft chew, like a toffee, that you chew for 20 to 30 seconds and swallow. Nothing to spit out.
How fast does it work?
Most people feel it in around 5 minutes, because caffeine starts absorbing through the mouth while you chew. The rest follows through the stomach, so the lift lasts a few hours.
How many can I have?
One chew is a sensible single dose. Up to 200mg (two Mint chews) in one go and 400mg a day is generally considered safe for healthy adults. Pregnant women should stay at or below 200mg a day. Not for children.
Is it vegan?
Caffeine Bullet is vegetarian but not vegan (it uses egg white powder). Ginger Roars and Sustain Gum are vegan.
What does L-theanine do?
L-theanine is an amino acid found in green tea. Taken with caffeine, it smooths the edgy, jittery side of caffeine, so you get alertness with a calmer, steadier focus.
How does Brain Bullet differ from Caffeine Bullet?
Caffeine Bullet is built for sport: more caffeine (85 to 100mg) for a strong kick. Brain Bullet has 80mg caffeine with 160mg L-theanine, for relaxed focus at a desk, in an exam or on a long day.
How many a day?
One chew is a single dose. Keep to 400mg of caffeine a day from all sources, which is five Brain Bullets with nothing else. Pregnant women should stay at or below 200mg a day. Not for children.
Is it vegan?
Brain Bullet is vegetarian but not vegan (it uses egg white powder).
What about delivery and returns?
Free UK delivery on every order, no minimum spend, usually 2 to 3 working days. If something is wrong with your order, email info@performancebullet.com and we will put it right.
Chew. Five minutes. Go.
A measured dose of caffeine in a chew that fits in your pocket. Free UK delivery.
Give procrastination the bullet
80mg caffeine, 160mg L-theanine, five minutes to focus. Free UK delivery.