Does Relentless Actually Work? (Answered)

Relentless has seen a steady increase in consumers in recent years. With 160mg of caffeine and an assortment of nutrients in every can, it’s not hard to see why the brand has become popular.

If you’re one of the people whose interest has been piqued by Relentless and is wondering if its claims have any truth, you’ve come to the right place!

The short answer is: Relentless does have the ingredients and capability to provide you with an energy boost.

But if you want to go deeper than that, I’ve come up with a detailed guide for you that includes Relentless’ ingredients, nutritional value, and its effects.

Read on!

Nutritional Facts of Relentless Energy

Below are the number of various contents Relentless claims to add to their drinks.

ContentQuantity (500mL)Daily Value (%DV)
(108 kcal)
of which Sugar
Nutritional Content of Relentless

Ingredients in Relentless Energy

Relentless comes with the basic ingredients present in most energy drinks, aside from a few rarities.

Relentless Ingredients
Ingredients on the back of a Relentless can
Ingredient TypeIngredients
EnergisersCaffeine, Guarana Seed Extract
WaterCarbonated Water
PreservativesPotassium Sorbate, Sodium Benzoate
Acidity RegulatorSodium Citrate
VitaminsTaurine, Niacinamide,
Pantothenic Acid, Pyridoxine,
Artificial SweetenerSucralose
AcidCitric Acid
Flavour EnhancerErythritol
ColourCaramel E150d
Relentless Ingredients

Erythritol in Relentless Energy Drink

Erythritol is a popular flavour enhancer used by many beverage manufacturers to act as a flavour enhancer in their drinks.

It plays a role in balancing the finished products’ flavour, colour, and texture.

It’s also an artificial sweetener that is derived from fermented glucose. It’s commonly added to diet products because it’s low-calorie.

Taurine in Relentless Energy

Taurine is produced within the human body and is also manufactured artificially and sold widely.

It is mainly included in energy drinks due to its ability to promote athletic and mental performance.

Other benefits of Taurine include its capability to prevent heart failure by lowering blood pressure and calming the nervous system.

Preservatives in Relentless Energy

Relentless contains Potassium Sorbate and Sodium Benzoate as preservatives in its drinks.

Potassium Sorbate is a tasteless salt synthetically made from sorbic acid and Potassium Hydroxide.

Sodium Benzoate is an odourless crystalline powder made through benzoic acid and sodium hydroxide.

These both help prolong the shelf life of Relentless and keep mould, yeast, and fungi at bay.

Guarana Seed Extract

Guarana Seed Extract is used to provide the caffeine present in most energy drinks. One gram of Guarana contains 40-80mg of caffeine.

It is used to enhance athletic performance and as a stimulant that reduces mental and physical fatigue.

Artificial Sweeteners in Relentless Energy Drink

Splenda packets
Splenda is the most widely used artificial sweetener.

Most energy drinks that use artificial sweeteners are usually sugar and calorie-free, in place of sugar they rely upon artificial sweeteners.

Relentless, however, use both, sugar and Sucralose in its drinks to get its unique taste.

Sucralose is a common artificial sweetener used widely in foods and beverages. The most commonly used Sucralose is Splenda and is often packed in yellow packets.

Artificial sweeteners do not have any conclusive effects on the body when used in moderation. However, too much of it may increase blood glucose and insulin levels.

Vitamins in Relentless Energy

Relentless contains a number of beneficial Vitamins. I have listed these and their functions below.

Vitamin B3

Also known as Niacinamide, Vitamin B3 is used for metabolizing fats and proteins and turning carbohydrates into glucose.

Niacin deficiency can cause skin rash, vomiting, and constipation, along with other side effects.

Vitamin B5

Pantothenic Acid or Vitamin B5 has similar properties as Niacin, and it aids in turning fat into energy.

Its other functions are keeping the skin healthy and keeping your hair in good condition.

Vitamin B6

Vitamin B6 is also known as Pyridoxine. It helps improve the circulation of amino acids within the body.

High amounts of amino acids can result in heart problems, and Vitamin B6 is essential in preventing this.

Pyridoxine also helps put you in a better mood by releasing the hormone Serotonin.

Vitamin B12

Cobalamin is another vitamin added in Relentless. It helps keep the body’s blood and nerve cells healthy.

Vitamin B12’s function is to produce red blood cells; deficiency of these could result in anaemia.

How Much Caffeine is in Relentless Energy Drink?

Relentless contains a notable 160mg of caffeine in a regular 500mL (16 fl.oz) can.

This amount is enough to rid you of fatigue for up to seven to eight hours.

While this amount is not more than the recommended 400mg per day, you should try not to have more than one drink a day to be safe.

Children and teenagers should not drink Relentless at any cost; the advised amount of caffeine for them is only 100mg.

How Much Sugar is in Relentless Energy Drink?

Relentless contains only 25g of sugar in reach 500mL (16fl.oz) can.

This amount is enormous; the daily advised limit of sugar intake per day is 30g. If you have had a can of Relentless, make sure you keep track of your other sources of sugar throughout the day.

People with diabetes are not recommended to have Relentless because of its sugar content. However, there are sugar-free energy drink brands that will fit their requirement.

What Happens When You Drink Relentless Energy?

Maybe you’re wondering how Relentless works and what processes are carried out within your body.

The caffeine present in it prevents Adenosine, a product within your body that makes you fall asleep. Vitamin B3 and Vitamin B5 helps turn fats into energy, making you feel more alert and less tired.

The video below provides a detailed explanation of how caffeine works.

What Flavours Does Relentless Energy Have?

Relentless comes with seven different flavours, each with its own signature taste. All of these are listed below:

  • Origin
  • Mango
  • Lemon Ice
  • Cherry
  • Passion Puch
  • Apple Kiwi

There’s one for everyone! Even if you don’t like the taste of the original flavour, try out the rest, you are sure to find one that fits your preference!

Relentless Alternatives

There are still many alternatives if in case Relentless doesn’t suit your preference, some of these are:

Red Bull

Red Bull Energy
Red Bull Energy drink

Red Bull is an 8.4 fl. oz energy drink containing 80mg of caffeine, 110 calories, and 27g.

Red Bull is a go-to energy drink both for adults and students looking for an extra boost of energy. However, make sure that you don’t overconsume Red Bull as it is high in sugar.

Red Bull is not bad for your health, but too much of it may cause adverse health effects.

Rockstar Energy Drink

Rockstar Energy Can
Rockstar Energy

Rockstar Energy is another energy drink brand famous in the UK. This is another brand that provides a boosting punch.

Every 16 fl. oz of Rockstar has 160mg of caffeine, 63g of sugar, and 122 calories. These ingredients are pretty hefty. Despite Rockstar’s benefits, I do not recommend drinking it more than once a day as it may lead to some severe side effects.

Other noteworthy mentions:

Final Verdict

Yes, the combination of ingredients present in Relentless is specifically added to boost your performance.

Vitamins, Caffeine, Taurine, and Erythritol all help eliminate fatigue, making you physically and mentally alert.

So if you’re a student, an athlete, or just an average joe looking to stay awake the night, Relentless is a great option for you. It contains enough ingredients to fulfil your needs but keep in mind that moderation is the key.

I wouldn’t recommend Relentless to teenagers, pregnant women, and diabetics, because the drink contains quite a good amount of sugar and calories that could be detrimental to their health.

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About Adrian Carter

Adrian writes about energy drinks and their ingredients to shine a light on the facts behind the brand names.


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