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Is Relentless Energy Drink Vegan? (Ingredients Review)

Is Relentless Energy Drink Vegan? (Ingredients Review)

Lots of people are embracing a vegan diet nowadays, and since you’re reading this article, you’re probably one of them.  

Maybe it’s because you feel strongly about the ethics of animal testing. Or it could be because of your concerns for the environment. It might have been what the doctor prescribed, or just a personal decision you’re making to improve your health. 

Whatever your reasons may be, a vegan diet certainly has its benefits, and it’s definitely worth the effort to find out whether your favourite food and drinks are vegan friendly. 

With that in mind, let’s talk about whether Relentless energy drink is vegan or not. 

We’ll begin by looking at the ingredients and nutritional information of Relentless energy drink to see what we can learn from there.

Let’s get started…

What Are The Ingredients In Relentless Energy Drinks?

Relentless energy drink ingredients.
The ingredients in Relentless energy drinks aren’t derived from animals.

Every 500ml can of Relentless contains:

  • 108 calories
  • 160mg caffeine
  • 31g carbohydrates
  • 24g sugar
  • 0.70g salt
  • 16mg niacin (vitamin B3)
  • 8.5mg pantothenic acid (vitamin B5)
  • 2.0µg cobalamin (vitamin B12)

It also contains trace amounts of:

  • Carbonated water
  • Sucrose
  • Citric acid
  • Erythritol (Flavour enhancer)
  • Taurine (0.4%)
  • Sodium citrate (Acidity regulator)
  • Potassium sorbate
  • Sodium benzoate
  • Caramel E150d (Color)
  • Sucralose
  • Guarana seed extract

So… Is Relentless Energy Drink Vegan Friendly?

A huge buffet spread of various vegetables.
Relentless is suitable for vegans.

Yes, Relentless energy drinks are definitely vegan friendly.

Let me explain in greater detail.

Based on the ingredients that I just listed above, there doesn’t seem to be anything of animal origin and there is also no use of dairy products.

However, here’s a closer look at some of the other ingredients that may be of concern to you: 

IngredientsPurposeWhere does it come from commercially?Is it vegan?
Niacin (vitamin B3)Helps convert carbs and fat from food into energy. SyntheticYes
Pantothenic acid (vitamin B5)Helps convert carbs and fat from food into energy. Mostly synthetic.Yes
Cobalamin (vitamin B12)Helps convert carbs and fat from food into energy. Bacterial, fungal or synthetic.Yes
Citric acidFlavouring or preservative.Vegetable, bacterial, fungal, or mould.Yes
ErythritolFlavour enhancerVegetable (usually corn)Yes
TaurineEnhances physical performance when used in combination with caffeine. Usually synthetic.Yes
Sodium citrateAcidity regulatorFruitsYes
Potassium sorbatePrevent growth of yeast or mould. Mineral-syntheticYes
Sodium benzoateAnti-microbial agent. Prevents drink from spoiling. Mineral-syntheticYes
Caramel E150dColouringVegetable (usually corn)Yes
SucraloseArtificial sweetenerSyntheticYes
Ingredients that may be of concern to vegans.

As you can see, there really is nothing to worry about here. So if you’re a vegan and you want to enjoy a can of Relentless, go right ahead.

But please avoid drinking too much of it since it can have some pretty nasty side effects on you. This would be the case no matter what energy drink brand you take, honestly.

You can find out more about what I think of Relentless energy drink in this review post that I’ve written.

And check out the video below too for an idea of what others think of Relentless. 

Is Relentless Energy Drink Good For You? 

If you’re looking for a drink to help boost your energy levels and to improve your physical and mental performance, Relentless might be a good option for you. 

However, you need to keep these things in mind too: 

  1. Your current health status
  2. How much of Relentless you plan to drink
  3. How often you will drink Relentless energy drink

I don’t think it’s wise to simply introduce energy drinks like Relentless into your regular diet if you have any ongoing health issues.

Instead, I would advise you to consult your doctor first just to make sure you won’t face any ill effects from doing so.

Meanwhile, you also need to be careful about how much Relentless you drink at one time as well as the total volume you consume throughout the day.

This is because there may be a negative impact on your health if you drink too much of it. The high caffeine and sugar content that you find in Relentless energy drinks is the main cause for concern.

Lastly, how frequently you consume Relentless is also important.

If you asked me, I think it’s better to only drink it as and when you need a boost rather than turning it into a daily habit.

As long as you remember these points, you should be able to enjoy drinking Relentless and benefit from doing so.

Is the Caffeine Content In Relentless Energy Drink Safe?

A cup of coffee atop a wooden table.
Relentless energy drink has more caffeine than the average cup of coffee.

Relentless contains 160mg caffeine in a 500ml can.

That’s quite a lot!

In general, I prefer to have only 50mg to 100mg of caffeine per serving.

I feel this is a good practice as it prevents you consuming too much caffeine at one go which may be damaging for your health.

According to the guidelines from the European Food Safety Authority (EFSA), you should only drink up to 200mg of caffeine per serving. On a daily basis, you should also limit your caffeine intake to 400mg per day.

Taking all that into account, the caffeine content in a Relentless energy drink is actually okay as long as you stick to drinking one each time, and not more than two cans in a day.

The important thing is to know yourself and how much caffeine you can drink safely without suffering from any side effects and you should be fine.

Check out my other article about the ingredients in Relentless energy drink for more information on the risks of taking too much caffeine.

Is The Sugar Content In Relentless Energy Drinks Safe?

There’s 24g of sugar in each 500ml Relentless energy can.

The National Health Service (NHS) has advised that daily sugar consumption should not exceed 30g.

Based on this guideline, I’d say it’s safe to drink one can of Relentless a day, but no more than that.

I’ve written about the dangers of consuming too much sugar from Relentless energy drinks too, so do check out that article if you’d like to find out more.

Are There Any Health Warnings For Relentless That I Should Know About?

Relentless energy drinks include a health warning on the back of the can.

It states:

High Caffeine Content. Not recommended for children, pregnant or breastfeeding women, or people sensitive to caffeine. Consume Responsibly.

While this doesn’t have any impact on you as a vegan, you’d need to take note of this warning if you are pregnant or breastfeeding.

You should also not be giving this drink to your children.

What Are The Health Risks From Consuming Relentless Energy Drinks?

You would only face health risks from drinking Relentless if you consume it in excess.

It is perfectly safe to drink if you only drink it once in a while.

Even if you were to drink one can every day, it would still be alright as long as your overall caffeine and sugar intake remains within the recommended limits.

If you do drink too many Relentless energy drinks, you’ll very likely experience a sugar crash.

Other long term side effects you might face include:

  • Obesity
  • Diabetes
  • Pancreatitis
  • Heart disease
  • Vision loss
  • Cardiovascular disease

Meanwhile, a caffeine overdose will cause you to experience symptoms like these:

  • Anxiety
  • Insomnia
  • Headache
  • Fever
  • Irritability
  • Dizziness
  • Diarrhea

So, to avoid facing these problems, please be wise and take the necessary precautions when you drink Relentless.

Where Can I Get Relentless Energy Drinks From And How Much Do They Cost?

You should be able to find Relentless energy drinks at most convenience stores across the UK as it is manufactured in Ireland.

There are many places in the US where you can easily find it too.

If you live elsewhere, you could look for it online at places like Amazon or eBay. The average price for a can of Relentless is £1.

However, if you’re getting it online, you’d need to take into account the shipping costs involved too.

What Relentless Energy Drink Flavours Are There?

You’ll find seven flavours of Relentless available in the market: 

  • Origin
  • Zero (sugar-free)
  • Mango
  • Lemon Ice
  • Cherry
  • Passion Punch
  • Apple Kiwi

If you are a fan of fruity flavours, then the range of options that Relentless has to offer will be a delight for you. 

And, of course, you’ve also got a sugar-free version that’s great if you’re trying to reduce your calorie intake.

Alternative Energy Boosters For Vegans

If you decide that Relentless isn’t really for you after reading all that I’ve written here, these are some alternative energy boosters that you can try instead: 


Tea is great and it contains caffeine too, but in doses that aren’t as high as what you’d find in a can of an energy drink like Relentless. For example, you’d only get about 50mg of caffeine in a 220ml cup of black tea. 

You can also have the flexibility of leaving sugar out of the equation or adding as little or as much of it as you like to your cup of tea.


It goes without saying that this one definitely contains caffeine. As a reference point, a 60ml espresso has about 80mg of caffeine and if you made a 200ml cup of coffee using instant coffee powder, you would be consuming only around 5.7mg of caffeine.

Just like with tea, assuming you are brewing your own cup of coffee, you can always decide for yourself how much sugar you want to put into your beverage. Or you can even leave it out altogether. 


Another good energy booster that you can try is a smoothie. It’s rich in vitamins and makes a great and refreshing treat too. 

While you can easily buy one at a cafe or restaurant, you can also opt to whip one up for yourself at home with your own choice of ingredients. For example, you can try making a smoothie with a banana, a handful of spinach, a cup of soy or almond milk, a vegan sweetener (for example, maple syrup) and a few ice cubes.

I personally love banana and strawberry smoothies best.

Other Vegan Friendly Energy Drinks

There are a lot of vegan friendly energy drinks out there besides Relentless.

These include:


A sachet of REIZE energy drink powder next to a glass of the ready-made drink.
REIZE is suitable for vegans too.

REIZE is absolutely vegan friendly and has only 50mg of caffeine in each sachet. It’s completely sugar-free too.

REIZE contains a great mix of taurine, ginseng and B vitamins to go along with the caffeine and everything works together to give you a great energy boost, without the crash.

Best of all, you’ll only need to spend around $1 per drink, inclusive of shipping costs right to your door.

That’s outstanding value for money.

Choose REIZE and see for yourself just what a great energy drink it is, especially for vegans.

Relentless Energy Drink Review (Is It Worth It?)
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