Fat burn, VO2 max

Advanced multipurpose endurance supplement combining natural stimulants and adaptogens to maximize fat burn and boost performance.

  • Boosts fat metabolism
  • Improves VO2 max and endurance
  • Increases ATP energy levels
  • Reduces workout related stress
  • Reduces water retention

Regular price€39.99 Sale price€29.99Save €10.00

Quantity: 90 capsules / 30 servings

Dispatch within 48 hours. Delivery time depends on your location.

Fusion

€39.99 €29.99

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Fusion is a powerful multipurpose supplement designed for endurance athletes who want to stay lean and energized. It allows you to manage weight effectively while keeping your performance on point.

With a potent blend of natural stimulants and adaptogens, Fusion improves fat oxidation, boosts VO2 max and reduces stress — ideal for athletes who want to lose excess weight and increase overall endurance.

Why adaptogens? Workout related stress is a major factor affecting both weight loss and performance. During training, rising stress levels increase cortisol, which slows fat loss and hinders performance.  Fusion’s powerful adaptogen blend helps overcome these workout stress-related challenges, enabling you to lose weight faster and maintain peak energy.

Become leaner and faster with Fusion in just 2 weeks!

  • Boosts fat metabolism
  • Boosts VO2 max and endurance
  • Increases ATP energy levels
  • Reduces water retention
  • Reduces workout related stress
  • Increases focus
  • Reduces mental fatigue
  • Natural ingredients
  • Doping-free
  • Vegan capsules

Take 3 capsules with water approximately 20 minutes before exercise.

On non-training days, take 3 capsules in the morning.

After three months of taking the product, it is recommended to take a 3-4 week break.

Instructions on how to combine different adaptogen products are found on this link.

WARNING! The use of this product is not recommended for people who:
  • use antihypertensives and blood thinners — in this case, we advise against the use of this product and recommend that you consult your doctor, who knows you best, or the specialist who prescribed the medication;
  • are sensitive to stimulants in any way!

 

Per serving (3 capsules)

RDA*

Green tea extract (95% polyphenols, 45% EGCG)

540 mg *

Panax ginseng (80% ginsenosides)

30 mg *

Rhodiola (3% rosavins, 1% salidrosides)

240 mg *

Cayenne pepper extract (10:1)

120 mg *

Ginger extract (10:1)

120 mg
*
Grape seed extract (95% OPC) 120 mg

Dandelion extract (10:1)

60 mg
*

Caffeine

60 mg *

Food supplement. Ingredients: Green tea extract (95% polyphenols, 45% EGCG) 540 mg, Korean ginseng {Panax ginseng (80% ginsenosides)} 30 mg, Rhodiola {Rodiola rosea (3% rosavins and 1% salidrosides)} 240 mg, cayenne pepper extract (10:1) 120 mg, ginger extract (10:1) 120 mg, grape seed extract (95% OPC**) 120 mg, dandelion extract (10:1) 60 mg, caffeine 60 mg. Other ingredients: vegan capsule; lubricant: magnesium salts of fatty acids. May contain traces of oats, barley, wheat (GLUTEN), ribs, milk (MILK) or soy (SOY). Caution: Contains caffeine! The product is not suitable for children, pregnant women and nursing mothers. The product is not a substitute for a balanced diet. Keep out of the reach of children. Contains caffeine. Store in a dry, cool place, away from heat, light, and moisture. Net quantity: 90 capsules. *Values are given per serving. **Oligomeric proanthocyanidins.

Used by Elite Athletes

I take this supplement before training because it gives me that extra boost of energy I need to tackle even the toughest sessions. It also helps me stay focused during races and cuts down on fatigue, which lets me perform at my best in mountain running competitions.

Claudio Díaz Castán

I have been supplementing with Fusion for 3 years now especially before hard sessions and before / during races. I find a noticeable difference when I take it in a reduction of perceived exertion and a significant delay in fatigue. I implement it as a supplement before threshold / max effort sessions.

Patrick Delorenzi

Personally, I tried a combination of Fusion and Nitrates;  this gave me consistent energy and better effort management. If i want to go for a KOM or a shirt effort Race, this is what i prefer, the right boost. My body is now more defined; less perceived fatigue, better endurance thanks to the use of fat metabolism and easier recovery after. Exceptional

Alex Rigo

Fusion gives me a noticeable boost in alertness and power, especially before intense training days. I feel more “switched on” during sessions and can hold higher watts without fading as quickly. It’s also helping me gradually improve VO2 max in my current build.

Marco Grittner

My lifesaver for long runs! It helps burn fat, so it’s like having endless fuel. Since I started using it, I feel like I have an extra gear. I use it every day before training.

Cosimo Bertotto

Who Should Use Fusion?

Built for endurance, trusted for weight control — perfect for any athlete looking to feel lighter and faster.

Whether you’re a cyclist pushing for a better power-to-weight ratio, a runner looking to improve performance, or a triathlete pushing through a high-stress training schedule, Fusion helps you stay lean while boosting your endurance.

Already have your fueling strategy dialed in and looking for more? Fusion is your next move.

How Does Fusion Work?

Fusion combines natural stimulants and adaptogens to help you burn fat, increase energy, and stay in peak condition by:

  • Enhancing metabolism and fat oxidation
  • Boosting ATP energy levels and VO2 max
  • Reducing stress and water retention

This formula helps you stay lean and energized — without aggressive ingredients.

You’ll notice increased fat burn and reduced water weight within the first week. After two weeks, adaptogens reach full effect, helping you increase VO2 max, reduce stress, and recover faster.

Green Tea Extract

Rich in polyphenols — especially catechins — green tea helps improve metabolic flexibility and fat oxidation. This means your body can use more fat instead of carbohydrates for fuel, preserving glycogen stores. It also improves glucose tolerance and insulin sensitivity, allowing for more efficient energy use. Some studies show a caffeine-like increase in perceived energy without overstimulation. Thanks to increased mitochondrial ATP production, green tea extract supports sustained energy output during endurance activities.

Ginseng

A natural energizer that helps reduce fatigue and elevate energy levels. Ginseng enhances cellular energy production and reduces oxidative stress, helping athletes feel less drained during and after exercise. It's especially useful for long training periods when mental and physical fatigue starts to build up.

Rhodiola

Protects the body from stress, reduces fatigue, increases psychophysical strength, and improves mental processes. Increasing VO2 max through an improved stress response is the best long-term progress strategy in endurance sports.

Cayenne Pepper Extract

Known for its thermogenic effect, cayenne increases fat metabolism and can help your body burn more calories. It activates the TRPV1 receptor, which enhances the conversion of stored fat into energy and slightly raises body temperature — giving your performance a subtle but valuable metabolic boost.

Ginger Extract

Ginger is a powerful ingredient that reduces muscle soreness and accelerates recovery. It also boosts circulation, improving the delivery of oxygen and nutrients to muscles. As a mild thermogenic and natural stimulant, ginger offers a gentle energy lift without overstimulation. It may even reduce stomach discomfort from high-carb fueling.

Grape Seed Extract

Although research is still limited, grape seed extract is believed to improve blood circulation and potentially aid in reducing body fat. While results vary, it’s included for its possible synergistic role in supporting endurance metabolism and vascular function.

Dandelion Extract

A natural diuretic that helps flush out excess sodium and reduce water retention. This can lead to a leaner appearance and reduced bloating, especially during high-carb or salt-heavy phases.

Caffeine

Caffeine improves focus, increases fat utilization, and delays fatigue by reducing the perception of effort. It also enhances carbohydrate absorption, supports dopamine release, and provides a proven ergogenic effect.

Recommended Use

Take 3 capsules with water approximately 20 minutes before exercise.

On non-training days, take 3 capsules in the morning.

After three months of taking the product, it is recommended to take a 3-4 week break.

Instructions on how to combine different adaptogen products are found on this link.

WARNING! The use of this product is not recommended for people who:

- use antihypertensives and blood thinners — in this case, we advise against the use of this product and recommend that you consult your doctor, who knows you best, or the specialist who prescribed the medication; - are sensitive to stimulants in any way!

Customer Reviews

Based on 630 reviews
65%
(410)
14%
(88)
8%
(49)
5%
(31)
8%
(52)
L
Louis C. (Brussels, BE)

Fusion

T
Tegi (Bratislava, SK)
Fusion

i observing small improvements , but using for only one week ...

G
Geoffrey V.e. (Mechelen, BE)

Fusion

Reviews in Other Languages

T
Thomas S. (Tirschenreuth, DE)
Verbesserung VO2 max

Ich verwende Fusion schon länger, der VO2 hat sich bei mir von 50/51 auf 54 verbessert. Da ich aktiv noch an Triathlonwettkämpfen teilnehme, wird Fusion ein Bestandteil meiner Ernährung bleiben.

R
Rago G. (Limone sul Garda, IT)
Super

Effetto notevole su lunghe distanze e con riserva di energia da spendere ancora

Ottimo

T
Tom
Kann ich nur empfehlen

Seit ich Fusion nehme habe ich abgenommen und dabei meine Leistung um ca. 5 bis 10% erhöhen können. Mein VO2max hat sich in einen Monat um zwei Werte gesteigert.

At 4Endurance, our mission is simple

To provide elite-level nutrition at accessible prices for all. We follow the latest science in sports nutrition and use only high-quality ingredients that support your performance. From amateur enthusiasts to professional teams, we support athletes of all levels in reaching their goals.