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Hydration Sachet Stack - Variety Pack

Cramping. Pace Fade. Inconsistent Energy. There's a Reason, And It's Not Your Fitness.

Scientists call it "the second heart." It controls how your legs feel, how your pace holds, and why some runs fall apart. 11 reasons why hydration changes everything.

Read the 11 Reasons - See Why ↓

Most runners only think about hydration during the run. By then, they're already compromised. Here's why fixing it unlocks the consistency you've been chasing.

.01

Dehydration doesn’t just make you thirsty. It makes your heart work 15–20% harder.

Blood composition changes based on hydration. Properly hydrated blood flows smoothly. Under-hydrated blood thickens, and viscosity increases.

Your heart compensates:

more beats per minute, stronger contractions,

more beats per

increased effort to maintain the same output.

minute, stronger contractions, increased effort to maintain the same output.

Strategic hydration maintains optimal blood viscosity. Your heart supports performance instead of fighting resistance.

Eliminate The Cardiovascular Tax

.02

There's a pump in your legs you've never thought about. It fires 10,000 times per run.

Every footstrike activates your calf pump, moving up to 70% of venous blood from your legs back to your heart.

Scientists call it "the second heart." Not a metaphor. A real pump.

When blood volume drops and viscosity increases, your calf pump faces mechanical resistance, thicker blood that's harder to move. Your calves work overtime, burning extra energy.

Strategic hydration maintains optimal blood viscosity. Your calf pump moves blood efficiently instead of fighting resistance.

Support Your Second Heart

.03

Less blood volume means less oxygen delivered. It’s that simple.

Think of your blood like delivery trucks carrying oxygen to your muscles. Properly hydrated, every heartbeat sends a fuller truck. More oxygen is delivered.

When blood volume drops, each heartbeat sends a smaller truck. Less oxygen reaches your legs with every pump.

Your muscles need oxygen. They're not getting enough. So they switch to anaerobic metabolism, creating lactic acid fast. Your legs burn earlier than expected, miles before they should.

Optimize the delivery. Everything changes.

Optimize Your Oxygen Delivery

.04

Pace fade isn’t part of running. It’s a symptom of unsupported circulation.

Most runners accept pace fade as normal: "Miles 1-5 always feel better than miles 6-10."

It doesn't have to be.

Pace fade happens when your circulatory system can't maintain output. The cascade:

Blood volume drops

Blood thickens

Heart rate climbs

Oxygen delivery decreases

Lactic acid spikes

Pace fades

This isn't inevitable. It's preventable.

When circulation is properly supported, the cascade doesn't start. Blood stays fluid. Heart rate stays controlled. Mile 10 feels like Mile 3.

Eliminate Pace Fade

.05

Cramping isn’t random.

It’s your muscles signaling that circulation failed.

Mile 6. You're on pace. Then your calf locks up. Run over.

You think: "Pushed too hard. Should have stretched more. Bad luck."

None of that's true.

Cramps happen when muscles can't get what they need through circulation.

Blood volume drops

Circulation slows

Electrolyte balance shifts

Waste accumulate

Muscles can't relax

Cramp

It's not bad luck. It's a mechanical failure.

Support circulation. Maintain electrolyte balance. Cramps stop.

Eliminate Cramping

.06

One bad recovery bleeds into the next session. Then the next. Then the next.

Here's how training falls apart:

Tuesday: Good session. Poor overnight recovery.

Wednesday: Start tired. Session quality drops.

Thursday: Start even more tired. Barely get through it.

Friday: You're cooked. Training is now damage, not adaptation.

It's not one bad session. It's compounding degradation.

Now flip it: Proper overnight recovery. You wake up ready every day. Each session builds on the last. By Friday, you're hitting PRs, not survival mode.

Engineer Compound Recovery

.07

The voice in your head telling you to quit? It's not mental. It's oxygen.

Mile 1: Mind sharp. Focused. Motivated.

Mile 6: Mind negotiating. "Maybe just slow down a bit..."

Mile 9: Mind screaming. "Why are we doing this? Just stop."

You think it's mental toughness failing. It's not.

Your brain runs on oxygen. When circulation is compromised and oxygen delivery drops, your brain gets less fuel. Mental performance degrades just like physical performance. That inner voice shifts from encouraging to begging you to quit.

It's not a weakness. It's biology.

Sharpen Your Mental Edge

.08

Training consistency becomes your superpower.

When hydration is consistent, training becomes predictable. Good days become normal. Progress becomes linear instead of chaotic.

Elite runners eliminated hydration as a limiting factor. Circulation stays stable. Performance stays repeatable. Training actually builds.

Build Consistent Performance

.09

Elite runners don’t chase “good days.” They make every day a good day.

You know what a good day feels like:

Legs feel light.

Pace feels easy.

Everything clicks.

Problem: Good days feel rare. Random.

Elite runners flipped this. Good days aren't rare. They're the standard. Because they eliminated what creates bad days.

Bad days happen when blood volume is low, circulation is compromised, and oxygen delivery drops.

Good days happen when those systems are supported.

Make Good Days Normal

.10

Elite runners don’t just hydrate.

They hydrate strategically across three critical windows.

Most runners hydrate randomly: Drink when thirsty. Maybe during runs. Hope it's enough. It's not. And it's why performance stays chaotic. It's not. And it's why performance stays chaotic.

Elite runners support circulation across the complete 24-hour cycle:

Stage 1: Morning (Restore)

8 hours without fluid means blood volume is down. Morning hydration restores baseline before training starts.

Stage 2: Training (Maintain)

Sweat and effort deplete blood volume under load. Strategic hydration maintains circulation when stress is highest.

Stage 3: Overnight (Reset)

Most repair happens during sleep. Overnight hydration supports your second heart while you recover.

Three stages. Complete coverage. You start every run from optimal circulation, not deficit. Training works better. Recovery completes fully. Performance becomes consistent.

Support All Three Stages

.11

Every runner has a breakthrough moment. This is yours.

You've been training hard for months. Maybe years. Putting in the work. Following the plan. Doing everything right.

But progress has stalled. Times have plateaued. The next level feels unreachable.

Here's your breakthrough: It's not your training. It's not your talent. It's not your effort.

It may be circulation.

Thicker blood, struggling calf pump, reduced oxygen delivery, pace fade, cramping, slower recovery, mental fog, they're all circulation problems.

And they're all addressable.

Support your second heart strategically.

Maintain blood volume.

Keep circulation efficient.

Workouts that felt impossible become doable. Paces that seemed out of reach become training zones. Race times that felt like distant goals become realistic targets.

You've seen why circulation determines performance. Now here's how to support it.

Three formulas. Three windows. One system built for the way your body actually works.

STAGE 1: CORE HYDRATION / MORNING FOUNDATION

Restores blood volume after 8 hours without fluid. Prepares your second heart for the day ahead.

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Great quality and fit into my routine seamlessly, keeps my energy levels consistent and seeing great results in and out of the gym.

James M.,

Verified Buyer

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Great quality and fit into my routine seamlessly, keeps my energy levels consistent and seeing great results in and out of the gym.

James M.,

Verified Buyer

STAGE 2: ENERGY HYDRATION / TRAINING SUPPORT

Maintains circulation under load. Keeps your second heart pumping efficiently when stress is highest.

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They work perfectly! I always struggle to find a pre-workout style drink that works for me; they're too caffeinated or loaded with filler ingredients, but this isn't! It kept me hydrated and caffeinated to get through both my interval run and weight lifting sessions.

Joseph D.,

Verified Buyer

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They work perfectly! I always struggle to find a pre-workout style drink that works for me; they're too caffeinated or loaded with filler ingredients, but this isn't! It kept me hydrated and caffeinated to get through both my interval run and weight lifting sessions.

Joseph D.,

Verified Buyer

STAGE 3: SLEEP HYDRATION / OVERNIGHT RESET

Supports circulation while you sleep. Enables the repair, recovery, and adaptation that happens overnight

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LOVE the sleep hydration sachet. All of their hydration products have been absolute game changers for my marathon training. Having a specific product for each part of your training including your recovery is something I find so useful because now I know that hydration is something that isn't a factor that's slowing down my progress.

Michael D.,

Verified Buyer

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LOVE the sleep hydration sachet. All of their hydration products have been absolute game changers for my marathon training. Having a specific product for each part of your training including your recovery is something I find so useful because now I know that hydration is something that isn't a factor that's slowing down my progress.

Michael D.,

Verified Buyer

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Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
Hydration Sachet Stack - Variety Pack
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4.9/5 Customers rate Cadence for performance & hydration

Hydration Sachet Stack - Variety Pack

£22.50

£34.99

Save 30%

Complete 24-hour circulation support in one box:

Protects against cramps and sudden energy crashes during races

Designed specifically for long, high-intensity efforts

A flavour that doesn’t get boring, even hours into the effort

Everything your second heart may need to support the performance you've been building.

*Individual results vary based on training, nutrition, sleep, and overall health.

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Description of the option

£34.99

(£1.16 / Stick)

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£22.50

£34.99

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Month 1

30% Off your first order. Auto-applied at checkout.

+ Free whisk

(Value of £15)

+ Free Digital Fuel Guide

(Value of £25)

Month 2

15% Off

Free Core 550 Bottle

(Value of £15)

Month 3 +

15% off every month thereafter.

+ Free Sports Towel

(Value of £20)

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Tried, Loved & Approved by You

The Cadence Sachet Stack is the complete hydration package. With 30 total sachets, it includes all three of our Hydration Sachet options.

Core Hydration

Core 500 Sachets deliver a science-backed ratio of electrolytes, namely sodium, potassium and magnesium to help you maintain cellular hydration and electrolyte balance.

They feature our research-based ratio of Sodium, Potassium & Marine Magnesium, the perfect hydration solution to be used at any time of the day.

Energy Hydration

Energy Hydration Sachets are a potent electrolyte and energy blend, with Sodium, Potassium and Marine Magnesium.

The Sachets deliver an evidence based 2:1 ratio of L-Theanine and Caffeine. Studies show that this specific combination of L-Theanine and Caffeine can provide optimal mental and physical benefits, including improved mood, clarity of thought, reaction times, alertness, memory and learning, whilst also offsetting many of the negative side effects often associated with caffeine consumption. 

Sleep Hydration

Sleep Hydration Sachets offer a lower dose of electrolytes to help you retain more fluid overnight, thus reducing disturbed sleep from waking and promoting better restoration and regeneration.

The Cadence Sleep Formula is a potent formulation with active ingredients proven to help you unwind, fall asleep faster, and experience a longer, deeper, and more regenerative sleep. The Sleep Complex includes L-Tryptophan, L-Glycine, L-Theanine, Ashwagandha, Valerian Root Extract 10:1, Vitamin B6, Zinc, and a higher dose of Magnesium.

Core 500 Sachets

  • Sodium Chloride

  • Acidity Regulator (Citric Acid)

  • Watermelon Flavouring

  • Natural Flavouring

  • Potassium Chloride

  • Magnesium Citrate, Sweetener (Stevia Extract)

Race 500 Sachets

  • Natural Grapefruit Flavouring with other natural flavourings

  • Sodium Chloride

  • Acidity Regulator (Citric Acid)

  • Potassium Chloride

  • Magnesium Citrate

  • L-Theanine

  • Natural Coffee Extract

  • Sweetener (Stevia)

Sleep Hydration Sachets

  • Acidity Regulator (Citric Acid)

  • L-Glycine

  • L-Tryptophan

  • Sour Cherry Flavouring

  • Magnesium Citrate

  • Sodium Chloride

  • L-Theanine

  • Potassium Chloride

  • Ashwagandha

  • Sweetener (Stevia)

  • Valerian Root Extract

  • Vitamin B6 (Pyridoxine)

  • Zinc Bisglycinate

Royal Mail 24 - £4.99

Free Shipping on all orders over £50

Product is non-returnable.

Real results. Real testimonials. Real customers.

Convenient sachet for travel and in new, darker packaging, I can now differentiate the Recover Sleep from Core 500.

James M.

Distance Runner

I don’t need melatonin anymore. This does more – and feels cleaner.

Mhairi S.

CrossFit Athlete

Total game-changer for post – training recovery and sleep.

David L.

Triathlete

I used to wake up feeling stiff and slow. Now I’m alert and clear.

Noah P.

Marathon Runner

Deep Sleep Support With No Melatonin, No Crash, And Real Hormonal Balance.

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Used by Elite Athletes

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Cologne List® Approved

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Evidence-Based Formula

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Zero Melatonin, Zero Crash

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60-Day Money-Back Guarantee

Try Core Sleep Now

Scientists call it "the second heart." It controls how your legs feel, how your pace holds, and why some runs fall apart. 11 reasons why it changes everything.