Coffee and Golf: Does Caffeine Help Your Game? The Study

Coffee and Golf: Does Caffeine Help Your Game? The Study

The relationship between coffee and golf has exactly one controlled experiment behind it. In that trial, run on a real course, 12 skilled golfers given about 155 mg of caffeine before the round and again at the turn scored 2.5 strokes better than on placebo. They hit more greens in regulation, drove the ball about 3 percent longer, reported more energy, and felt less fatigue. Heart rate and putting posture did not change. The dose was moderate, roughly 1.9 mg per kilogram of body weight, and the key was splitting it in two: once at the first tee, once at the halfway house.

That single study, Mumford et al. 2016 in Medicine & Science in Sports & Exercise, is the entire evidence base for coffee and golf. One trial, 12 men, never replicated on a course. Here is every number worth knowing, the rules, and what you actually need in the cart.

Key Takeaways

• Caffeine lowered 18-hole scores by 2.5 strokes (76.9 vs. 79.4, p = 0.039) and raised greens in regulation from 6.9 to 8.6 (p = 0.035) in a single small trial.
• The dose was about 155 mg taken twice: before the round and after nine holes. Roughly two small cups of coffee total.
• Putting posture, heart rate, and breathing rate did not change, so the "shaky hands" fear does not show up at this dose.
• Caffeine is not banned in golf. It sits on the PGA Tour's 2026 Monitoring Program, meaning it is tracked but explicitly not prohibited.

Does Caffeine Improve Golf Performance?

Yes, in one controlled experiment. Mumford et al. (2016) ran a double-blind, placebo-controlled, crossover trial during a 36-hole competitive tournament. Twelve male golfers (mean age ~35, USGA handicaps 3 to 10) played 18 holes on two consecutive days, receiving either a caffeine supplement or a matched placebo before the round and again after nine holes. The dose averaged 1.9 ± 0.3 mg/kg per serving, about 155 mg each time.

Fairways hit and first-putt distance were also measured but showed no statistically significant difference. One study author worked for the supplement company that funded the trial, so the conflict is disclosed. And n = 12 is small. Treat the numbers as directional, not as a guarantee your Saturday foursome drops 2.5 strokes after a cup of coffee.

Why the Study Redosed at the Turn

The researchers did not give one big dose and send the golfers out. They split it: first tee and the turn.

Caffeine from a drink peaks in the blood within about 30 to 60 minutes. Its half-life in healthy adults averages about five hours, though individual variation runs from 1.5 to 9.5 hours depending on genetics, age, and liver function. By hole 12, a single first-tee cup is past peak and falling. Splitting the dose keeps levels more consistent through 18 holes without doubling the total load. For a deeper breakdown of how long caffeine stays in your system, including the variables that shift your personal half-life, we covered that separately.

Does Caffeine Make You Shaky When Putting?

At the moderate dose tested (about 155 mg), putting posture and peak trunk acceleration were unchanged compared to placebo. Heart rate and breathing rate held steady too. The golfers did not get the jitters.

That does not mean caffeine never causes tremor. Higher doses (above 300 to 400 mg in a single sitting), empty stomachs, and low habitual intake all increase the odds of shaky hands. The study used a moderate, split dose in experienced caffeine consumers. Slamming a 300 mg energy drink on an empty stomach before the putting green is a different experiment.

Separately, pairing caffeine with L-theanine has shown benefits for steady focus. Research on the combination, including a review of multiple trials covered on our blog, has found it improved attention-switching accuracy, sustained alertness, and reduced tiredness compared to caffeine or placebo alone. Those were not golf studies, but the mechanism is relevant to anyone who wants focus without physical agitation.

Caffeine on the Course: Dose-by-Format Comparison

Not every caffeine source fits in a golf bag. Here is what each format delivers and what it costs.

The study used roughly 155 mg per dose. A single pouch or gum piece at 80 mg lands below that; two pouches or a pouch plus a small coffee at the turn gets closer. A 16-ounce energy drink may overshoot it in one hit, and the sugar adds a variable the study did not test.

Is Caffeine Banned in Golf?

No. The PGA Tour Anti-Doping Program Manual (revised January 2026) lists caffeine on the 2026 Monitoring Program alongside nicotine, phenylephrine, and synephrine. The manual states these substances "are not considered Prohibited Substances" and that the presence of a monitored substance in a player's system "is not prohibited by the Program."

Monitored means the Tour tracks usage patterns for future policy review. It does not mean a positive test triggers a violation. For recreational and club golf, no anti-doping rule applies to your weekend round.

Using Caffeine on the Course Without Wrecking the Round

• Match the dose to the study. About 2 mg/kg, roughly 150 to 180 mg for most adults. One moderate cup or two 80 mg pouches.
• Split it: first tee and the turn. The study's protocol. This keeps levels steadier through 18.
• Eat something with it. An empty stomach amplifies jitters. A bar, a banana, or real food in the cart matters.
• Water every hole. Coffee is a mild diuretic. On a hot day, dehydration degrades motor control faster than caffeine helps it.
• Stop by early afternoon for evening tee times. Caffeine too late interferes with sleep. Allow at least 8 hours before bed.
• Stay under 400 mg for the day. The FDA's general guidance for healthy adults. Morning coffee plus a turn dose plus a post-round cup adds up fast.

Conclusion

Golf culture treats coffee as either a miracle fuel or a hand-steadiness hazard. The evidence is narrower than either camp admits.

"Coffee is my hydration plan." It is not. The mild diuretic effect means coffee replaces less fluid than it appears to. On a 90-degree day, water does the hydrating; coffee does the alertness. Separate jobs.

"If a little helps, a lot helps more." No dose-response data exists for caffeine and golf. One moderate dose was tested. Anecdotal reports of improved play after 400 mg are just that, and they compete with a real risk of tremor, elevated heart rate, and a back nine spent looking for a restroom.

One small study, one moderate split dose, one promising but unreplicated result. That is what we know. Everything else is personal experimentation.

Frequently Asked Questions

Does caffeine help your golf game?

In the only controlled trial on a real course (Mumford et al. 2016), golfers given about 155 mg of caffeine before the round and at the turn scored 2.5 strokes better, hit more greens, and drove about 3 percent farther. The study was small (n = 12) and has not been replicated, so the result is promising but not definitive.

How much caffeine should you have before golf?

The study used about 1.9 mg/kg per dose, roughly 155 mg for an average-sized man, taken twice (first tee and turn). Total for the round: about 310 mg, within the FDA's 400 mg daily guideline.

Should you drink coffee before golf?

Coffee works, but the study used a supplement, not brewed coffee. What matters is the dose (~150 to 180 mg), the timing (before the round and at the turn), and having food in your stomach. A small to medium cup before the first tee gets you in range.

Is caffeine banned in golf?

No. Caffeine sits on the PGA Tour's 2026 Monitoring Program, which tracks usage but explicitly states that monitored substances are not prohibited. For club and recreational play, no caffeine rule exists at all.

Does caffeine affect your putting?

At about 155 mg per dose, putting posture and trunk acceleration were unchanged versus placebo. The study found no evidence of impaired fine motor control at that amount. Higher doses or empty stomachs could change the outcome.

What is the best energy drink for golf?

There is no single best option. A typical 16-ounce energy drink contains 200 to 300 mg of caffeine plus sugar, overshooting the tested dose. Zero-sugar cans reduce crash risk but still deliver a heavy single hit. Caffeine pouches or caffeinated gum offer dose control without liquid, which is easier in a cart.

The Dose the Study Used, Without the Second Cup

The tension in the Mumford data is the redose. The benefit came from about 155 mg at the first tee and another 155 mg at the turn, two separate caffeine events across a four-plus-hour round. A travel mug covers the first. The second usually means whatever the snack shack has or a can rattling in the cupholder.

Roon is a zero-nicotine oral pouch with 80 mg caffeine, 60 mg L-theanine, 25 mg methylliberine (Dynamine), and 5 mg theacrine (TeaCrine). The methylliberine is there to extend the caffeine. In a randomized, double-blind, crossover PK study (n = 12), co-administration of methylliberine with caffeine cut caffeine's oral clearance from 41.9 to 17.1 L/hr and extended its half-life from 7.2 to 15 hours, with no increase in peak concentration. That study used 100 mg methylliberine and 150 mg caffeine, about 4x the methylliberine and nearly 2x the caffeine in a Roon pouch, so the exact magnitudes do not transfer. The mechanism is directionally the same: same peak, longer tail. Roon's felt window is 6 to 8 hours, designed so a pouch at the turn can last through 18 rather than peak and fade.

Roon is not a score improver. The 2.5-stroke result belongs to the Mumford trial and its specific protocol. What Roon offers is a controlled 80 mg dose paired with L-theanine (a combination that research has linked to improved attention and alertness) in a format that fits a golf bag: no liquid, nothing to spit, zero sugar, zero nicotine. Tins start at $9.16 on subscription (15 pouches, $0.61 each) or $15.00 one-time. The longer half-life also means stop at least 8 hours before bed. If you have an afternoon tee time, plan accordingly.

Related from Roon

• Golf Fatigue on the Back Nine: How to Finish Strong
• Best Golf Snacks for 18 Holes
• How Long Does Caffeine Stay in Your System?
• Caffeine Gum, Explained

Written by Roon Team