Bring on the third set.
FOCUS + ENERGY + RECOVERY
Veech Ketone Ester fuels your brain and muscles. Before, during and after you play. While you sleep too.
Legal performance enhancement. Batch tested for WADA-prohibited substances.
MONEY-BACK GUARANTEE.
1 Fuel. 3 Jobs.
One molecule. Your brain and your muscles both burn it.
Stay quick and make fewer mistakes when you’re tired.
PROOF: Under mental fatigue, reaction time slowed 9% on placebo and didn’t slow on Ke4. Running to exhaustion, multitasking errors rose by 1.8 on carbs alone and didn’t rise with the ketone ester. See the chart ↓
More in the tank for the third set.
WHAT IT PROVIDES: D-BHB—the same ketone your own liver makes.
Sleep & recover better after a hard day.
PROOF: Better sleep efficiency and less REM loss after a strenuous day. The sleep data ↓
Proven outcomes.
Measured in human VKE studies:
Placebo slowed 9%. Ke4 didn’t slow.
LAB TASK-SWITCHING TEST · ROCA 2026+1.8 errors on carbs alone; no increase with ester.
SHUTTLE-RUNNING STUDY · EVANS & EGAN 2018Higher sleep efficiency and less REM loss than placebo.
POST-EXERCISE SLEEP STUDY · ROBBERECHTS 2023More power than placebo in a 30-minute time trial.
8-WEEK CYCLING STUDY · ROBBERECHTS 2026And you’ll still have something left after the last changeover.
Mental fatigue slows you down.
Ke4 blocked the slowdown.
25 adults. A 20-minute mental-fatigue task. Reaction time before and after. Lower is faster.
GROUP MEANS, TABLE 1. TASK-SWITCHING REACTION TIME, A LAB TEST OF ATTENTION. THE CAFFEINE ARM IS SHOWN BECAUSE THE STUDY MEASURED IT; CAFFEINE IS NOT PART OF THE PROTOCOL. ROCA ET AL. 2026, J STRENGTH COND RES · PMID 42429835.
956 to 1,041 ms.
957 to 922 ms.
Everyone felt more tired. The Ke4 group stayed quick.
Play today.
Play tomorrow.
Take it right after a tough game, and a small amount right before bed.
After a strenuous day, athletes on this routine slept more efficiently and kept more of their REM sleep.
Saturday singles into Sunday doubles. Back-to-back league nights. A tournament weekend. Tomorrow’s match starts with tonight’s sleep.
PROOF: Robberechts et al. 2023 · details ↓
“I’ve also used Ke4 before tennis matches when I needed a boost of energy and have found it to work well.”
MEAST22207 · TENNIS CUSTOMER
CUSTOMER REVIEW. AN EXPERIENCE, NOT A MEASURED RESULT.
Built for DARPA.
Made to keep soldiers strong and sharp when it matters most.
In 2003, DARPA’s Metabolic Dominance program went looking for a food that would hold off fatigue and keep soldiers’ physical and mental performance up through days of intense operations. It funded Dr. Richard Veech’s lab at the National Institutes of Health to build it. The result was the Veech Ketone Ester.
Same molecule. Now it’s in your tennis bag.
HISTORICAL RESEARCH FUNDING. DARPA AND THE DEPARTMENT OF DEFENSE DO NOT ENDORSE KETONEAID.
Before. During. After. Bed.
There’s a protocol for match day, for training blocks and for sleep. Amounts for each product and goal are on the protocols page.
Fuel the brain before the first serve.
Take it before you warm up. It provides D-BHB rapidly, fuel for your head and your legs from the first point.
Top up every couple of hours.
Long matches and tournament days: take more every couple of hours, depending on how hard you’re working. Easiest way: pour it into your water bottle.
Right after a tough game.
Take it as soon as you come off court after a hard match. That’s the recovery dose, and it pairs with a small amount before bed.
Sleep is the longest changeover.
Take a small amount right before bed. In athletes, VKE after a strenuous day and before bed improved sleep efficiency and counteracted the drop in REM sleep.
FIRST TIME? TRY IT AT PRACTICE, NOT FIRST TIME ON MATCH DAY. MORE ≠ BETTER.
Join the community of over 5,000 members.
Get advice or share your experience — what worked, what didn’t. ketoneaid.com/fb · TEXT 703-829-9411
Give it 8 weeks.
One session tells you how it feels. A training block shows you what you’re really capable of.
In trained athletes, 8 weeks of VKE after training and before bed came with about 4% more power than placebo. Play it through a season, not a weekend.
PROOF: Robberechts et al. 2026, J Physiol · trained cyclists · details ↓
Stock up!
Bulk packs bring the price per gram down. Same Veech Ketone Ester, enough for the whole block.
Considering VKE for your club, shop or program? Contact us.
College teams, tennis clubs, adult programs and league captains. If you’re fueling more than one player, talk to us.
- Pilot it at practice before a tournament weekend.
- Protocol guidance for match days and tournament weekends.
- Wholesale pricing for programs, with the same molecule in every bottle.
- Third-party batch-test documentation on request.
TEXT 703-829-9411
No Other Ketone Comes Close
Every study on this page used one molecule: the Veech Ketone Ester, developed by Dr. Richard Veech and Todd King at NIH. Ketone salts, butanediol and other esters are different molecules with different research and very different focus + performance results (none that are credible). A blood ketone reading is not a result; the studies are.
R 1,3-butanediol is inebriating for most people, especially at the doses it takes to produce significant blood ketone levels. Not good for your game. That’s why we use it in our own Hard Ketones alcohol alternatives, and why it stays out of your tennis bag.
Win one rally, win free shipping.
You’re on the left. Get one ball past the computer and free shipping is yours.
Rally
DRAG ON THE COURT, MOVE YOUR MOUSE OR USE THE ARROW KEYS.
GET ONE BALL PAST THE COMPUTER TO WIN.
THE BALL SPEEDS UP EVERY SHOT. HIT IT OFF THE EDGE OF YOUR RACQUET FOR A SHARPER ANGLE.
A GAME. NOT A TEST OF ANYTHING.
SHOP VKE →Same Veech Ketone Ester, three concentrations
Same molecule. Pick your potency.
Concentration decides taste.
Strong, bitter and most compact. Not “better”, just less water.
Three times the water of Ke4 at the same price per gram. We named the flavour “Not Bad” and meant it.
Ready to drink, nothing to measure. The easiest way to find out what this actually feels like.
ALL KETONEAID PRODUCTS ARE 3RD-PARTY BATCH TESTED FOR WADA-PROHIBITED SUBSTANCES. ATHLETES: CHECK YOUR EVENT / FEDERATION’S CURRENT RULES.
Ketone ester and tennis.
What is Veech Ketone Ester, and why do tennis players use it?
Veech Ketone Ester (VKE) is a food that fuels your brain and muscles with D-BHB, the same ketone your liver makes. In human studies, it kept reaction time from slowing under mental fatigue, kept multitasking errors from rising in exhausting stop-start running, and improved sleep after a strenuous day. There’s no direct tennis trial yet; the data comes from other sports. These findings concern Veech Ketone Ester; they cannot be assumed for different ketone molecules.
When should I take Veech Ketone Ester for tennis?
Try Veech Ketone Ester during practice first. On match day, take it before you play, top up every couple of hours on long days (it mixes into your water bottle), take more right after a tough match, and a small amount right before bed. Amounts for each product and goal are on the protocols page.
What’s the difference between Ke4, Ke2, and Ketone Shot?
All three contain the same Veech Ketone Ester at different concentrations. Ke4 is 50% VKE: the most compact and the strongest tasting. Ke2 is 25%: more water, easier to drink. Ketone Shot is 8%: ready to drink, nothing to measure, easy to carry. Concentration alone doesn’t set how much ester you take; how much you drink does. Amounts for each product are on the protocols page.
Do I need a keto diet to use Veech Ketone Ester?
No. Veech Ketone Ester raises blood ketones on its own, so you get the fuel without changing how you eat. It puts you in a temporary state of ketosis while you keep your normal carbohydrates. You don’t need a ketogenic diet to use it, and it isn’t a replacement for one.
Does Veech Ketone Ester contain caffeine?
No. Veech Ketone Ester contains no caffeine, and caffeine isn’t part of the KetoneAid protocol. One study of this ester included a separate arm with caffeine added, which is why caffeine appears in our research summaries. If you also use caffeine, read the label of anything you combine and start with less than usual.
Will Veech Ketone Ester keep me up after a night match?
Veech Ketone Ester isn’t a stimulant, and the protocols include a small amount before bed. Take it right after you finish playing, then a small amount right before bed. In athletes, VKE taken after a strenuous day and again before bed improved sleep efficiency and counteracted the usual drop in REM sleep.
Do I still eat and drink water when I use Veech Ketone Ester?
Yes, keep eating and drinking normally. Veech Ketone Ester is fuel that works alongside food and water, not a replacement for either. Keep your usual match-day meals and hydration, and take VKE alongside them. Try it at practice first so you know how it sits with what you normally eat.
Are all ketone drinks the same?
No. Different ketone molecules behave differently, and results from one don’t transfer to another. Veech Ketone Ester is the molecule used in the studies on this page. Some ketone drinks use R 1,3-butanediol instead, an alcohol ketone precursor that can be inebriating; KetoneAid’s own Hard Ketones uses it on purpose for the buzz effect. Compare the ketone types.
Is ketone ester allowed in tennis?
Veech Ketone Ester (VKE) is not listed on the current WADA Prohibited List, and all KetoneAid products are third-party batch tested for WADA-prohibited substances. Tennis anti-doping rules follow the WADA Code, so check the current rules for your tour, federation or event before you use anything, and keep your batch documentation.
What if I don’t feel a difference with VKE?
Follow our protocols. If you don’t feel it, reach out and we’ll help you hone in on how to use it for your specific case. If you’re still not satisfied we offer a money-back guarantee.
Will Veech Ketone Ester help me recover after tennis?
Yes. Some of the world’s most elite endurance Tour de France athletes use it primarily for recovery. KetoneAid sponsors 2 teams with product, not cash, because they actually use it. In athletes, VKE after a strenuous day and before bed also improved sleep efficiency and counteracted the drop in REM sleep.
Get VKE in your tennis bag.
MONEY-BACK GUARANTEE. TRY IT AT PRACTICE FIRST, NOT FIRST TIME ON MATCH DAY.
What’s actually been measured.
No VKE study has tested tennis. These are the human studies of Veech Ketone Ester that the claims above lean on. Protocol, result, why it matters, and where it stops.
Under mental fatigue, the placebo group slowed 9%. The Ke4 group didn’t slow down.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXT
ROCA ET AL. 2026
J STRENGTH COND RES
PMID: 42429835 · FOCUS
Under mental fatigue, the placebo group slowed 9%. The Ke4 group didn’t slow down.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXTJ STRENGTH COND RES
PMID: 42429835 · FOCUS
PROTOCOL
- 25 healthy adults (20 men, 5 women), double-blind randomized crossover.
- Three arms: Ke4, placebo, Ke4 with caffeine.
- Cognitive battery (task-switching, Stroop) before and after a 20-minute mental-fatigue task.
- Ke4 dose scaled to body weight.
WHAT HAPPENED
- Task-switching reaction time, group means before → after: placebo 956 → 1,041 ms; Ke4 957 → 922 ms; Ke4 + caffeine 993 → 864 ms.
- Ke4 vs placebo favoured Ke4. Ke4’s own before-to-after change was not statistically significant.
- Perceived fatigue roughly doubled in all arms.
WHY IT MATTERS
- Tennis asks for decisions at a high heart rate, point after point. This is a direct measure of staying quick while mentally tired.
- The molecule in the study is the molecule in the bottle.
CONTEXT
- A seated lab test of attention, not a tennis test. Nobody measured a match.
- The caffeine arm is reported because the study measured it. Caffeine is not part of the KetoneAid protocol.
- Values are the group means reported in Table 1.
SOURCE: PUBMED 42429835. Title: Ketone Monoester, With and Without Caffeine, Prevents Mental Fatigue and Preserves Cognitive Performance. Roca GM, Barker GA, Waldman HS.
Stop-start running to exhaustion: multitasking errors rose by 1.8 on carbohydrate alone and didn’t rise with the ketone ester.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXT
EVANS & EGAN 2018
MED SCI SPORTS EXERC
PMID: 29944604 · FOCUS / ENERGY
Stop-start running to exhaustion: multitasking errors rose by 1.8 on carbohydrate alone and didn’t rise with the ketone ester.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXTMED SCI SPORTS EXERC
PMID: 29944604 · FOCUS / ENERGY
PROTOCOL
- 11 male team-sport athletes.
- Intermittent shuttle running to exhaustion.
- Carbohydrate alone vs carbohydrate plus the ketone ester, at 750 mg of ketone ester per kg of body weight.
WHAT HAPPENED
- Increase in multitasking errors late in the test: +1.8 on carbohydrate alone, +0.0 with the ester.
- No difference in reaction time, sprint times or total run time.
WHY IT MATTERS
- The closest published analog to a long match: repeated sprints and changes of direction, with decisions to make while tired.
- The brain kept doing the complex task. Sprint and run times didn’t change.
CONTEXT
- Shuttle running, not tennis. Team-sport athletes, not tennis players.
- Nothing measured on court.
SOURCE: PUBMED 29944604.
After a strenuous day, the ester routine improved sleep efficiency and counteracted the drop in REM sleep.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXT
ROBBERECHTS ET AL. 2023
MED SCI SPORTS EXERC
PMID: 37259248 · RECOVERY
After a strenuous day, the ester routine improved sleep efficiency and counteracted the drop in REM sleep.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXTMED SCI SPORTS EXERC
PMID: 37259248 · RECOVERY
PROTOCOL
- Trained athletes, placebo-controlled crossover.
- A strenuous training day, then the ketone ester after exercise and 30 minutes before bed.
- Sleep measured overnight.
WHAT HAPPENED
- Sleep efficiency improved versus placebo.
- The usual post-exertion drop in REM sleep was counteracted.
WHY IT MATTERS
- This is the routine behind “after you play and before bed.”
CONTEXT
- Measured sleep, not next-day tennis performance.
- Trained athletes in a lab, not players on court.
SOURCE: PUBMED 37259248.
Eight weeks of the after-training and before-bed routine: about 4% more power than placebo.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXT
ROBBERECHTS ET AL. 2026
J PHYSIOL
PMID: 41757674 · RECOVERY
Eight weeks of the after-training and before-bed routine: about 4% more power than placebo.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXTJ PHYSIOL
PMID: 41757674 · RECOVERY
PROTOCOL
- 28 trained men enrolled (13 + 13 analysed), placebo-controlled.
- 8 weeks of supervised endurance training, ester after each session and 30 minutes before bed.
WHAT HAPPENED
- Final 30-minute time trial: 302 vs 291 W, about 4% more power with the ester.
WHY IT MATTERS
- Supports making it a routine, not a one-off dose.
CONTEXT
- Cyclists. It supports the routine; it does not predict tennis results.
SOURCE: PUBMED 41757674.
The soreness null: no faster recovery of soreness, jump or isometric strength after muscle-damaging exercise.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXT
MARTIN-ARROWSMITH ET AL. 2020
FRONT NUTR
PMID: 33364251 · RECOVERY
The soreness null: no faster recovery of soreness, jump or isometric strength after muscle-damaging exercise.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXTFRONT NUTR
PMID: 33364251 · RECOVERY
PROTOCOL
- Eccentric muscle-damaging exercise.
- Ketone monoester vs energy-matched carbohydrate during recovery.
WHAT HAPPENED
- No difference in soreness, jump performance or isometric function recovery.
WHY IT MATTERS
- VKE’s recovery evidence is about sleep, not soreness.
CONTEXT
- A null result, shown so you know what hasn’t been found.
SOURCE: PUBMED 33364251.
Same molecule, two protocols, two results: glycogen 246 vs 164 mmol/kg on a glucose clamp; no difference with a normal recovery drink.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXT
HOLDSWORTH 2017 · VANDOORNE 2017
MED SCI SPORTS EXERC · FRONT PHYSIOL
PMID: 28398950 · PMID: 28588499
Same molecule, two protocols, two results: glycogen 246 vs 164 mmol/kg on a glucose clamp; no difference with a normal recovery drink.
PROTOCOL · WHAT HAPPENED · WHY IT MATTERS · CONTEXTMED SCI SPORTS EXERC · FRONT PHYSIOL
PMID: 28398950 · PMID: 28588499
PROTOCOL
- Holdsworth: ketone ester plus a glucose clamp after glycogen-depleting exercise.
- Vandoorne: ketone ester plus a normal carbohydrate-protein recovery drink.
WHAT HAPPENED
- Holdsworth: muscle glycogen 246 vs 164 mmol/kg dry weight with the ester.
- Vandoorne: no glycogen difference; mTORC1 signalling was higher with the ester.
WHY IT MATTERS
- Proper results depend on proper use. Same molecule, different protocol, different result.
CONTEXT
- Neither study is a performance test. Both are lab recovery protocols in trained men.
SOURCES: PUBMED 28398950 · PUBMED 28588499.
VKE is a food, not a dietary supplement. The studies on this page used Veech Ketone Ester (aka ketone monoester); results do not transfer to other ketone products. Amounts and timing for each product are on the protocol page. Statements on this page describe the role of a food in nutrition and performance; they are not medical advice.