Fat burn, VO2 max

The perfect multipurpose supplement for endurance athletes that combines the power of adaptogens with natural stimulants.

  • Boosts fat metabolism
  • Boosts VO2 max
  • Boosts ATP energy levels

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

Fusion is a multipurpose supplement designed to boost fat metabolism, increase ATP energy levels, and boost VO2 max, making it the first supplement every endurance athlete should consider after a good source of carbohydrates.

Fusion is based on carefully selected adaptogens and natural stimulants that allow you to burn fat and manage weight in a natural, healthy, and efficient way.

Fusion allows you to burn fat in three ways

  1. It boosts fat metabolism to increase your body's ability to burn fat.
  2. It increases oxygen flow (VO2 max) to further improve your training efficiency.
  3. It increases ATP energy levels, which allows you to train harder and burn more fat.

Natural stimulants

Fusion contains natural stimulants that allow you to boost your fat metabolism, increase fat burn, reduce the sensation of fatigue, and improve your athletic performance.

  • Caffeine
  • Green tea extract
  • Cayenne pepper
  • Ginger

Adaptogens

Increase your ATP energy levels, reduce exercise-induced stress, and boost your VO2 max with carefully selected adaptogens!

  • Rhodiola
  • Ginseng

Reduce water retention

Fusion allows you to reduce water retention with dandelion extract. Combined with fat burn, this is the ultimate way to manage weight for training and races.

Burn fat, boost VO2 max, and increase ATP energy levels with Fusion, the ultimate multipurpose supplement for all endurance athletes!

  • Boosts fat metabolism
  • Boosts VO2 max
  • Boosts ATP energy levels
  • Reduces water retention
  • Reduces exercise-induced 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 *

Dietary 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.

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.

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 70 reviews
77%
(54)
11%
(8)
6%
(4)
3%
(2)
3%
(2)
T
Tom P. (Bruges, BE)

Since taking these pills, my Vo2 has gotten much better
Less fatigue after training and work

W
Wayns w. (Brussels, BE)
It really works 🚀👊🏻

this is a great product. after 1 month I lost 4 kg and could easily maintain that weight, I don't have to adjust my diet for it. after three months I have now switched to absolute and am super happy with the result. endurance is great and no problems with acidification. I can recommend it to everyone!

j
jeroen k. (Wolvega, NL)
Really gives more power

Now half way through this bottle and really feel difference in max power and endurance. I cycle 3x a week with a schedule and on my vo2 max training if really looks I can put out more wattage and maintain that longer.

Reviews in Other Languages

A
Alberto C. (Amadora, PT)
Fusion

Já se notam os efeitos da embalagem anterior. Menos peso maior facilidade nas subidas, tanto em estrada como em BTT. Recomendo para uma perda de peso gradual.

A
André T. (Lisbon, PT)
Muito impressionado com o produto

Produto muito bom, leve no estômago e realmente começamos a sentir uma entrega melhor a nível físico

S
Samantha
Use kar rabis

Izjemno zadovolna, vedno uzamem pred fitnesom, hribi in morm rect da me napovne z energijo ki jo se kako rabim. Priporocam!

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.