CoreCtrl
Hot 70.3 or Ironman booked? One sachet a day for eight days, the last on race morning.
Informed Sport certified · 60-day guarantee




Developed with two-time Olympic champion Alistair Brownlee.
60-day guarantee, opened or not. See Delivery and returns
Made in the UK
Informed Sport certified
4,000mg L-taurine · No caffeine · 1 kcal
“… The main reason for experimenting with CoreCtrl is for the Everesting World Championships on Mt Etna in September where temperatures will be mid to high-twenties.… Everesting World Championships on Mt Etna …”
“I used the CoreCtrl specifically to target an indoor cycling race which was taking place during a heatwave. … The sachets were easy to take …… indoor cycling race … during a heatwave …”
“… Battle tested at 36 deg in the European Aquabike Championships and in days leading up to it.… Battle tested at 36 deg …”
Batch tested
Our philosophy
Own your physiology. We develop what it takes for you to do just that.
Same philosophy, every product: based on the latest science, test it in the real world, stripped of anything that isn’t needed to perform again tomorrow.
Used by elite athletes around the world.
How to use
One sachet a day for eight days, ending on race morning.
| Race | Seven days before, the eighth sachet on race morning |
|---|---|
| Training block | One a day through the block, a week off after 24 days |
| Daily | One sachet in 500ml of water, at the same time each day |
| Pair it | Electrolytes during the session itself |
For a plan built on your race, your sweat and the weather, build your plan on this page. For a personal recommendation, email support@truefuels.com.
What it is
An eight-day protocol of 4,000mg L-Taurine and four electrolytes per sachet, taken before the heat arrives.
Eight sachets, one a day. Use Electrolytes during the session itself.
- 4,000mg L-Taurine
- Built for heat
- Leeds Beckett University study underway
- Eight days
Delivery and returns
Delivery to the UK: 1 to 3 working days, free over £40, otherwise the fee shows at checkout.
The 60-day guarantee covers opened products. If it isn’t right, email support@truefuels.com within 60 days of purchase for a full refund.
You can cancel an order within 14 days, then return unopened products in their original condition within a further 14 days. We refund in full within 14 days of receiving them. Return postage is yours unless the item is faulty.
Faulty or damaged? Email support@truefuels.com with your order number and a photo. Full details in our returns and refunds policy.
CoreCtrl · from £28.95
01 / The problem
CoreCtrl · 8 days-
Your race is hot.
Most of the energy you burn leaves your body as heat. In a hot, humid race, getting rid of it starts competing with your legs.
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Your training wasn’t.
A week in a warm hotel won’t change that.
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Start seven days out.
One sachet a day for eight days, the last on race morning. It won’t cool you down; it’s part of your race-day protocol.
“… Using it for my heat training regime before a hot race. … Will continue to use it in training blocks and the 8-day lead up to my race.”
02 / Why it works
Start before the heat does.
4,000mg L-Taurine
Per serve, across the full eight days.
Built for heat
For races and training blocks in hot conditions.
Study underway
Leeds Beckett University study underway.
Eight days
A simple daily routine, race morning included.
Why taurine
Heat research has studied it at doses around 4g a day, taken for days before exposure, not on the day.
- 4,000mg
- L-Taurine a day
- 8
- Days, the last on race morning
- 0mg
- Caffeine
Informed by Peel et al. (2024)
03 / The protocol
Two ways to use it.
One a day for eight days, the last on race morning.
£3.62 a day for eight days.
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Under 60kg: 2 days on, 1 day off, eight sachets over 11 days.
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Race morning
One a day through the block.
30 to 60 minutes before the session. Summer training, a warm-weather camp, sessions in a hot room. After 24 days in a row, a week off before restarting.
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- A week off
Both: one sachet in 500ml of cold water, same time each day; on training days, 30 to 60 minutes before.
04 / Proof
What athletes told us.
4.8
16 reviews
- 100%
- rated CoreCtrl 4 or 5 stars
16 of 16 reviews rate it 4 or 5 stars · Informed Sport tested batch by batch · Made in the UK
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“I used the CoreCtrl … the week leading up to Swansea 70.3 Ironman race, which had temperatures in the late 20’s early 30’s on the day … I will definitely be taking these to Kona with me in October.”
Lester B. · after Swansea 70.3 · review via Judge.me -
“… Battle tested at 36 deg in the European Aquabike Championships …”
Gareth S. · European Aquabike Championships · review via Judge.me -
“I used the CoreCtrl specifically to target an indoor cycling race which was taking place during a heatwave. … The sachets were easy to take …”
Hayley S. · review via Judge.me -
“… The main reason for experimenting with CoreCtrl is for the Everesting World Championships on Mt Etna in September where temperatures will be mid to high-twenties.”
Jez T. · review via Judge.me
05 / The system
The race-day system.
Eight days to race morning: CoreCtrl. On the day: Electrolytes in the bottle, High Salt gels in the pocket. Three products, one job each.
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Energiegele
40g Carbs per gel
From £29.95
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Elektrolyte
1g Salt per stick · 390mg sodium
From £24.95



Alistair’s perspective
“If heat is a major factor, prepare properly.”
CoreCtrl
Alistair Brownlee · Two-time Olympic triathlon champion · Co-founder
Multipacks
Stock up for race season.
- 8sachets One protocol per hot race or heat block
- 16sachets 16 sachets, two protocols
- 32sachets 32 sachets, four protocols, a full race season
The Fourth Discipline™
The system is ours. The destination is yours.
06 / Formula
What's inside. Nothing it doesn't need.
L-Taurine plus four electrolytes and black pepper extract. Six ingredients, nothing for show.
This formula doesn’t stop evolving once it ships. We keep testing and refining it with sports scientists and our own athletes.
See our processThe core of the protocol
As potassium citrate
As calcium citrate
From Himalayan rock salt
As magnesium citrate
Piper nigrum
Per sachet: 1 kcal, 0.3g carbohydrate.
07 / How to use
Choose your race. Get your protocol.
For your own numbers, build your plan below.
Your kit
CoreCtrl
Energy Gels
Electrolytes
Your kit
CoreCtrl
Energy Gels
Electrolytes
Your kit
CoreCtrl
Energy Gels
Electrolytes
Your kit
CoreCtrl
Energy Gels
Electrolytes
Race protocol · Half Ironman
Hot race- 1 CoreCtrl sachet a day from 7 days before, the eighth on race morning
30 min before- 1 Electrolytes in 500ml water
Pre-start- 1 Energy Gel
Energy Gels- bike 2 to 3 an hour = 80 to 120g carbs. Run 2 an hour = 80g carbs. Low Salt for normal sweat; salt marks or extreme heat: High Salt
Hydration- 400 to 800ml an hour. Heat or heavy sweat: 1 Electrolytes
Straight after- 1 Electrolytes in 500ml water
Race protocol · Ironman
Hot race- 1 CoreCtrl sachet a day from 7 days before, the eighth on race morning
30 min before- 1 Electrolytes in 500ml water
Pre-start- 1 Energy Gel
Energy Gels- bike 2 to 3 an hour = 80 to 120g carbs. Run 2 an hour = 80g carbs. Low Salt for normal sweat; salt marks or extreme heat: High Salt. Add on-course nutrition as needed
Hydration- 500 to 900ml an hour. Heavy sweaters: Electrolytes
Straight after- replace 100 to 150% of the fluid lost, 1 Electrolytes in 500ml water
Race protocol · Marathon
Hot race- 1 CoreCtrl sachet a day from 7 days before, the eighth on race morning
30 min before- 1 Electrolytes in 500ml water
Pre-start- 1 Energy Gel
Energy Gels- 2 an hour = 80g carbs. Low Salt for normal sweat; salt marks or extreme heat: High Salt
Hydration- 150 to 250ml per gel. Heat or heavy sweat: 1 Electrolytes
Straight after- 1 Electrolytes in 500ml water
Race protocol · HYROX
Hot race- 1 CoreCtrl sachet a day from 7 days before, the eighth on race morning
30 min before- 1 Electrolytes in 500ml water
Pre-start- 1 Energy Gel
Energy Gels- mid-race (about 40 min), 1 gel, optional. Low Salt for normal sweat; salt marks or extreme heat: High Salt
Hydration- sip at each station
Straight after- 1 Electrolytes in 500ml water
08 / Your plan
Get your personalised fuelling plan.
If you have tested your sweat rate or sodium concentration, entering these will sharpen the fluid and electrolyte recommendations. Leave blank to use the algorithm's estimates.
Algorithm informed by published research on exercise fluid replacement, sweat rate, sweat sodium concentration and carbohydrate use during endurance exercise, including Sawka et al. (2007), Jeukendrup (2011) and Baker (2017). Constants: 40 g carbohydrate per gel, 1 g salt per high-salt gel, 0.25 g salt per low-salt gel and 1 g salt per electrolyte serving. Scientific estimate only. Individual variation exists. Validate all recommendations in training before race day.
09 / Athletes
Trusted from the podium to the parkrun.
Tap a face to read their story.
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Ben Millar
“I fuel for the work I put in, to maximise adaptations and recover well so I’m ready to go again, day after day.”
Ben Millar · Reflex-Nopinz
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Malachi Cashmore
“Before I started fuelling my key sessions properly, I thought dead legs and collapsing on the floor after long rides was normal.”
Malachi Cashmore · Professional triathlete
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Joanna Tallmann
“My running has improved noticeably. That is due to consistent training and growing experience, but above all to slowly getting the hang of fuelling.”
Joanna Tallmann · Ultrarunner
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Alistair Brownlee
“Simple things done consistently are usually what make the difference.”
Alistair Brownlee · Co-founder
10 / Questions
Questions? Answered.
Which protocol do I use?
Racing: eight days to race morning. Training: daily through the block, a week off after 24 days.
Is there a lighter dose?
Under 60kg: 2 days on, 1 day off, until all eight sachets are taken, the last on race morning. That is 11 days in total.
What does it taste like?
Mild peppermint. A few people find it unusual at first.
Does it cool me down?
No product cools you on its own, and we won’t pretend otherwise. CoreCtrl is preparation: the dose used in heat research, taken before the heat arrives.
Isn’t taurine in energy drinks?
Same amino acid. No caffeine, no sugar, and a dose and timing taken from research rather than a can.
£28.95 for one race?
£3.62 a day for the eight days before the hottest race of your year.
Do I still need electrolytes?
Yes. CoreCtrl doesn’t replace hydration; on the day use Electrolytes and your gels as normal.
Racing somewhere warm this winter?
Start seven days before you fly, not when you land.
Indoor race or turbo in a heatwave?
Use it the same way: one a day for eight days, the last on race morning.
Multi-day event?
From seven days before, then one each morning of the event.
Will it arrive before race week?
Delivery to the UK: 1 to 3 working days, free over £40, otherwise the fee shows at checkout.
The first sachet is seven days before the race; order before then.
Is it tested for banned substances?
Yes. Every batch is Informed Sport certified before it ships.
Is there scientific research behind it?
Yes. The formula is informed by research on taurine supplementation in hot conditions, including the work of Peel et al. (2024).
Who is CoreCtrl for?
Every athlete who trains or competes in hot or humid conditions, including marathon running, triathlon, HYROX and cycling.
“… Racing Ironman Da Nang in 35-degree heat with a Kona slot on the line, nutrition couldn’t be an afterthought. …”
truefuels® · The Fourth Discipline™
Your race is hot. Start seven days out.
Pick the race or the block, count back seven days, start there.
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