Sustained EnergyGo further than
Go further than
you thought possible.
Endurance isn't just cardio. It's the science of energy management - keeping glycogen topped up, hydration balanced, and fatigue at bay over hours of sustained output.
The Fuel Economy of Performance.
Your body is a machine that runs on chemistry. When glycogen depletes, sodium drops, and lactate accumulates, performance doesn't gradually fade - it hits a wall. The difference between finishing strong and fading is fuel management.
Our Increase Endurance range targets every link in the energy chain: rapid carbohydrate delivery, precision electrolyte balance, oxygen transport, and lactate buffering.
StaminaEndurance
HydrateElectrolytes
FuelGlycogen
OxygenVO2 Max
Endurance Fuel
Supplements to keep you going
Premium formulas engineered for sustained energy output over hours of demanding performance.
NEW
BESTSELLER
NEW
VO2 Max
✓
VO2 Max | Organic Mushrooms
✓
190 kcal per bottle
£19.99
NEW
Endurance Science
The Science of Endurance
Each pillar targets a distinct energy system with clinically validated ingredients at effective dosages.
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Fuel Systems
Your muscles burn through glycogen at a rate that outpaces digestion. We use duel-sourced carbohydrates for sustained glucose delivery without GI distress.
- ✓ Glucose
- ✓ Fructose
water_drop
Hydration
A 2% drop in body mass from sweat impairs endurance by up to 25%. We deliver precision-ratio electrolytes with high levels of sodium and chloride to replace what's lost.
- ✓ Sodium (400mg)
- ✓ Chloride (400mg)
air
Oxygen Delivery
VO2 max is the ceiling of aerobic performance. We use PeakO2, an organic mushroom blend that improves oxygen utilization and mitochondrial efficiency via bioactive compounds.
- ✓ Bend of 6 organic mushrooms
- ✓ Clinically studied
Heart Rate Zones
Train by heart rate zone.
Enter your age to calculate personalised heart rate zones. Each zone demands different fuelling strategies - tap a zone to see the optimal nutrition protocol.
Max HR: 194 bpm (Tanaka formula: 208 - 0.7 × age)
Endurance Science
The Fuel Protocol
Every ingredient is selected for its ability to sustain energy output, maintain hydration, or delay fatigue over extended efforts. Isotonic, fast-absorbing, and stomach-friendly.
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Ingredient Spotlight
Dextrose / Fructose
A dual-carbohydrate system designed to maximise carbohydrate absorption and energy delivery during endurance exercise. Dextrose (glucose) and fructose use different intestinal transporters (SGLT1 and GLUT5), allowing higher total carbohydrate uptake.
+8-15%
Improvement in time to exhaustion
90g/hr
Optimal Intake
Race Day Protocol
The Fuel Sequence.
Timing is everything on race day. Here is how to structure your endurance nutrition for sustained energy from start to finish.
3hr Pre
PRE
Load
Carb up with Dextrose/Fructose to top off glycogen stores without GI distress.
Carb Loader
During
RACE
Fuel
2 servings of Carbs every 30-45 minutes delivering 40g carbs per hour for sustained output.
Energy Gel
Every 20min
HYDRATE
Hydrate
Electrolyte mix with sodium chloride to replace sweat losses and maintain plasma volume.
Electrolytes
Post
POST
Repair
Recovery Blend with protein, carbs, and tart cherry to accelerate glycogen resynthesis and reduce inflammation.
Recovery BlendEndurance Intelligence Hub
Use our interactive tools to plan your race fuelling, calculate your target pace, and estimate your sweat rate for optimal hydration strategy.
Race Details sync
Science: Endurance events >90min require 60-90g carbs/hr. Dual-source carbs (glucose + fructose) allow absorption rates up to 90g/hr.
FUEL PLAN
245TOTAL CARBS (G)
8GELS NEEDED
70G CARBS / HR
2.1FLUID (LITRES)
Race Distance directions_run
Negative splits (faster second half) are the hallmark of a well-paced race.
PACE BREAKDOWN
4:30MIN / KM
7:14MIN / MILE
13.3KM/H
22:305K SPLIT
Session Data water_drop
SWEAT RATE
2.0L/hr
2.0TOTAL LOSS (L)
2.8% BODY WEIGHT
The Standard
Fuel the distance.
Shop Increase Endurance
Fuel the distance.
Finish stronger.
By combining glucose (dextrose) and fructose in a 2:1 ratio, we leverage dual intestinal transport systems to increase total carbohydrate delivery to working muscles. The result is a more efficient fuel supply during prolonged activity, helping to maintain pace, support glycogen sparing, and reduce the likelihood of energy dips or gastrointestinal discomfort compared to single-source carbs.
Sodium, chloride, potassium, and magnesium in research-backed ratios that match real sweat composition. Not a one-size-fits-all tablet, but a precision formula designed for serious endurance performance.
Developed and validated with endurance athletes in real race conditions. Every formula is tested for absorption under physiological stress, GI tolerance, and palatability during extended efforts.
Frequently Asked Questions
Current research supports 30-60g of carbohydrates per hour for events lasting 1-3 hours, and up to 90-120g per hour for ultra-endurance events when using dual-source carbohydrate formulas (glucose + fructose).
For exercise lasting over 60 minutes, electrolyte replacement is essential. Sweat contains 900-1400mg sodium per litre. Drinking plain water dilutes blood sodium and can lead to hyponatremia. Our formulas match real sweat composition.
While fasted training can improve fat oxidation rates, it impairs high-intensity performance and risks muscle protein breakdown. For race preparation, we recommend training with your race-day nutrition strategy to optimise gut absorption.
Pre-load with sodium (1500mg) 60-90 minutes before, then consume 500-800ml per hour during exercise with electrolytes. Weigh yourself before and after to calculate your individual sweat rate and personalise your plan.
Sustained Endurance Performance
Endurance performance is ultimately limited by fuel availability, hydration status, and the body's ability to buffer metabolic waste. At EFECTIV, our Increase Endurance range is engineered for athletes who need sustained energy output over hours of demanding activity. Our products feature Cluster Dextrin for rapid gastric emptying, precision electrolyte formulas matching real sweat composition, and beetroot extract standardised for nitric oxide production. Whether you are a marathon runner, cyclist, triathlete, or team sport athlete training for sustained performance, our endurance line delivers the fuel, hydration, and recovery support your body needs to go further than you thought possible.