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Is Relentless Energy Drink Bad For You? (Secrets Revealed)

Relentless is a strongly caffeinated energy drink. With 160mg of caffeine in a 500ml can, it can surely keep you awake.

But when you’re drinking the energy drink often or regularly, the question remains whether the energy drink will leave any negative impact on you or not.

If you want me to answer shortly, Relentless is not bad for you if you consume in moderation.

However, there’s more to than just consuming it within limits. This post will go through all the details you need to know about Relentless energy drink and help you decide whether it’s good for you or the opposite.

Let’s get started.

Which Ingredients Used In Relentless?

The following is the list of ingredients used in a single 500ml can of Relentless:

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

What Are The Nutrients Of Relentless?

A can of Relentless energy drink has the following nutrients in each serving:

Nutrients EmployedAmount Per Serving (500ml)
Total Sugar24g
Niacin (Vitamin B3)16mg
Pantothenic Acid (Vitamin B5)8.5mg
Vitamin B61.5mg
Vitamin B122.0 ug
Energy108 calories
The nutrients that are applied in each Relentless energy drink.
A photo of the nutrition facts of Relentless energy drink, held in a hand
Nutrition facts of Relentless energy drink.

Prime Ingredients Of Relentless Energy Drink


A 500ml can of Relentless has 160mg of caffeine in them.

The caffeine content in Relentless is double the caffeine content of Red Bull, as it has 80mg of caffeine.

Caffeine consumption of 160mg per day will not cause any problems.

On the other hand, you need to keep an eye on the amount of caffeine you’re drinking, especially if you consume too many energy drinks in a day.

The European Food Safety Authority (EFSA) recommends consuming no more than 400mg of caffeine in a day for men and women.

Consuming more than 400mg of caffeine in a day will cause health risks like:

  • Anxiety
  • Nervousness
  • Shakiness
  • Lack of sleep
  • Losing the ability to focus
  • Drowsiness

It’s recommended not to drink more than 400mg of caffeine in a day. It’s also suggested not to consume more than 200mg of caffeine in a single sitting.

Everything depends on your caffeine tolerance and your body’s ability to metabolize caffeine. If you have high caffeine tolerance, you’ll feel energized and more awake. But if you’re not tolerant to high caffeine, you’ll feel uneasy after consuming 160mg of caffeine.

A photo of a young girl sleeping
Consuming too much caffeine will result in insufficient sleep.

I like to have about 50-100mg of caffeine in my energy drinks. I feel uneasy and it leaves hot flushes in me if I go for energy drinks with more caffeine content. So I don’t usually drink high caffeinated energy drinks unless I need to get through the day.


A single 500ml can of Relentless has 24g sugar in it.

24g sugar may not look like much, but it’s a lot of sugar, especially in an energy drink.

For reference, the National Health Service UK (NHS) has stated to consume not more than a maximum of 30g of free sugars in a day.

Free sugar means the additional sugar added to products that are already sweetened before. Foods like chocolates, cakes, energy drinks, and soft drinks tend to have a lot of free sugars in them.

Considering 30g as your daily sugar consumption, if you drink a can of Relentless in a day, it takes most of your sugar intake.

Free sugar or additional sugar is not suitable for your health. Devouring too much sugar can have horrible effects on your health:

  • Weight gain
  • Spike in blood pressure
  • Heart palpitations
  • Running short on breaths
  • Diabetes
  • Heart disease
  • Chronic kidney disease
  • Prediabetes

But the good news is, Relentless has a sugar-free version available.

A photo of a man adding sugar in their coffee, in a table
Free sugar is not healthy for your body.

Guarana Seed Extract

Guarana or guarana seed extract is another example of caffeine. It’s present in many energy drinks, including Relentless. What guarana seed extract does is enhance the caffeine present in energy drinks.

Caffeine content ranges from 3.6 to 58% in guarana. One gram of guarana contains 47mg of caffeine.

Although the amount of guarana in Relentless isn’t specified, I’m guessing it’s not too much. Or else you’ll be consuming more than 160mg of caffeine.

Besides these, guarana has a lot of benefits. Some of which are:

  • Promotes weight loss
  • Boosts physical performance
  • Enhances cognitive performance
  • Reduces fatigue
  • It May used to treat low blood pressure

Check out this study to see the therapeutic uses of guarana.

How Many Calories Does Relentless Have?

Every 500ml can of Relentless has 108 calories.

The NHS UK recommends consuming 2,500-2,000 calories a day for healthy men and women.

If you consider 2,000 calories a standard, consuming a can of Relentless won’t do any harm. 108 calories for an energy drink in a day won’t hurt your diet.

Which Vitamins Used In Relentless?

Relentless has used four different B vitamins in general, namely: Vitamin B3, B5, B6, and B12.

I put together an easy-to-read table to better understand all the B vitamins’ properties used in Relentless.

Vitamins AppliedPropertiesAmount Present In RelentlessRecommended Daily Intakes For Both Men and Women
Vitamin B3 (Niacin)It helps in lowering LDL cholesterol and increasing HDL cholesterol. Improves skin.16mg16/14mg
Vitamin B5 (Pantothenic Acid)It helps in converting complex food into energy. Carbohydrates, proteins, and fats are easily converted. 8.5mg5mg
Vitamin B6 (Pyridoxine)It helps our body in producing melatonin, which results in good sleep. Promotes better brain health and a strong immunity system.1.5mg1.4/1.2mg
Vitamin B12It helps in maintaining both our nerve and blood cells healthy. 2.0ug 2.4ug
The B vitamins and properties found in a can of Relentless

B vitamins will bring us many health benefits, but consuming more than the recommended amount can raise health risks than doing any good.

Plus, B vitamins are water-soluble; there’s no point in adding more B vitamins than the tolerable daily intakes as the excessive B vitamins will flush down your toilet.

Can You Drink Relentless Every Day?

You can drink Relentless every day.

Energy drinks provide you with an energy boost and keep you focused. The effects are most noticeable if the energy drink consumes regularly.

Consuming energy drinks will cause health problems. You won’t feel any mental or physical energy boost, but rather the side effects.

If you want to drink Relentless every day, you can, but I don’t recommend it.

If you still want to, limit your intake to 1 can of Relentless in a day as the energy drink is highly caffeinated.

Is Relentless Good For Your Health?

Relentless can be good for your health to a specific boundary.

The drink has 160mg of caffeine, which is more than enough to keep you awake. It also has 24g of sugar. Both of these will work together in giving you an excellent boost of energy.

Some of the benefits drinking Relentless might provide are:

  • Feeling refreshed
  • Boost in energy levels
  • Enhanced mental performance
  • Improved athletic performance

Relentless can be pretty good for your health if you’re not going overboard with your consumption.

Here is a brief video review of Relentless Berry flavour.

Is Relentless Bad For Your Health?

Relentless is not bad for you unless you’re not following limits.

The caffeine and sugar content will work in giving you an excellent boost of energy. So if you’re not drinking too much Relentless, you won’t face any problems.

If you’re reckless with your consumption and drink too many cans of Relentless, you may face side effects like:

  • Caffeine overdose
  • Sugar crashes
  • Caffeine crash
  • Fatigue
  • Lack of focus
  • Diabetes
  • Nausea
  • Headaches

All of these side effects are only noticeable if you’re not careful with your consumption.

If you’re someone who drinks Relentless every day, limit your intake to one can of Relentless in a day. And keep track of the caffeine content you are consuming.

Flavours Of Relentless

Relentless offers seven different flavours and two versions. Regular and sugar-free. All of which are:

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

Where To Buy Relentless Energy Drink?

You can buy Relentless from your local super shops: Tesco, Poundland, B&M, or Sainsbury’s. The energy drink is trendy in the UK, so that it’ll be available in most shops.

Or you can choose the better and convenient way and buy online. I personally prefer purchasing online as there are always vouchers and discounts going on.

A photo of shopping online using credit card
Buying online can save you from going outside, and you can get discounts too.

You can purchase a 500ml of Relentless for about £2, which is not expensive at all, in my opinion.

You can buy Relentless from the energy drink’s official website, Amazon, eBay, or British Corner Shop.

Energy Drinks You Can Try Instead Of Relentless

If Relentless doesn’t fit your style, you can try these energy drinks instead:

Final Roundup

Relentless, given the price point and everything the energy drink offers, can be a great choice of energy drink for many people.

£2 for each 500ml can and being packed with multi-vitamins, I would say it’s a win. You don’t need to worry about your energy boost as it has 160mg of caffeine, 24g sugar, and only 108 calories.

All these together will leave you feeling refreshed and energized. The drink is not bad for you unless you’re drinking too much. Consuming 160mg of caffeine will keep you more than awake.

So hopefully, the drink won’t cause any problems.

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