Relentless energy drinks are manufactured in Ireland. The product is owned by the Coca-Cola Company. It has been in the market since 2006 and is popular both in the UK as well as the US.
In brief, a standard can of Relentless Energy contains 160mg of caffeine, 24g of sugar, 108 calories, B vitamins, and other active ingredients.
In this post, I’ll discuss the ingredients of Relentless Energy so you’ll be aware of what nutrients you’re getting in each serving.
A fair warning though, avoid drinking Relentless or any energy drink as a habit. It can greatly pose a danger to your overall health in the long run.
I hate to keep you waiting. So, off to the real deal!
Where Can I Buy Relentless Energy Drink?
If you’re living in the UK, you should be able to find Relentless Energy at most shops within your community.
As for the average price for a can of Relentless Energy, it should be around £1 per can.
But there’s always the option of buying it online. You can try sites like Amazon or eBay. However, you may need some time to compare prices and shipping costs to ensure you’re getting the cheapest possible price.
Take note that this is not inclusive of shipping costs.
What Flavours Does Relentless Have To Offer?
Relentless comes in seven flavours. They are:
- Origin
- Zero (sugar-free version)
- Mango
- Lemon Ice
- Cherry
- Passion Punch
- Apple Kiwi
Other than Relentless Origin and Relentless Zero, most of the other flavours of Relentless are fruity in nature.
So if this kind of taste appeals to you, then you might enjoy trying the full range of flavours that the brand has to offer.
Relentless Energy Drink Ingredients
In a 500ml can of Relentless Origin, you will find these ingredients:
- 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)
Relentless 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
Most of these ingredients are pretty common in energy drinks and there isn’t really anything unusual in this list. In fact, everything is very clearly spelled out here, including the quantities used for the main ingredients.
Relentless Energy Drink Caffeine Content
Relentless has 160mg of caffeine in each 500ml can.
It is safe to drink Relentless Energy as long as your total caffeine consumption for the entire day does not go over 400mg.
This figure is based on the recommendations of the European Food Safety Authority (EFSA) which states that you should limit yourself to a maximum of 400mg of caffeine per day. It also suggests you take only up to 200mg of caffeine in each serving.
My personal practice is to actually limit caffeine consumption to around 50mg to 100mg per serving.
With these things in mind, it’s obvious that the caffeine levels in Relentless are safe for you to consume. You need to remember to take stock of how much caffeine you are consuming from other sources too.
You should also always keep a lookout for any symptoms of caffeine overdose.
In addition, all of these guidelines assume that you are a normal, healthy adult.
The situation would be different if you have any health problems. If you do, then it would be wise to consult a doctor before deciding to consume energy drinks like Relentless.
The reason that we don’t want to end up taking too much caffeine is to avoid health problems such as these:
- anxiety
- irritability
- drowsiness
- heart Burn
- insomnia
- high blood pressure
- caffeine addiction
- rapid heart rate
- fatigue
- frequent urination
- muscle breakdown
- digestive issues
Furthermore, here’s how much the FDA recommends you take your caffeine.
| Age | Recommended Daily Amount |
| Kids | 60-80 mg |
| Teenagers | 100 mg |
| 18 and above | 400 mg |
How much sugar is in Relentless?
A 500ml can of Relentless contains 24g of sugar.
Sugar-wise, Relentless Energy is safe to consume as long as your total intake of free sugars in a day does not exceed 30g.
The National Health Service (NHS) tells us that adults should have no more than 30g of free sugars in a day.
What is meant by “free sugar” here is the sugar that you find in the food and drinks that you are eating every day. This also includes things like honey, and syrups as well as unsweetened fruit and vegetable juices.
So you’ve actually got to monitor all the sources of sugar you’re consuming on a daily basis in order to decide whether or not what you find in a can of Relentless is safe for you.
With this in mind, it’s best to only drink one can of Relentless in a day. Or you could go for Relentless Zero (the sugar-free version) if you want to consume more than one can.
I would suggest that you don’t go beyond the 30g quota suggested by the NHS so that you won’t be exposed to these health issues:
- weight gain
- heart disease
- acne
- type 2 diabetes
- cancer
- depression
- skin aging
- fatigue
- fatty liver
- kidney disease
- gout
- dental cavities
Relentless vs Red Bull
Caffeine
Red Bull contains 80mg of caffeine whereas Relentless has 160mg of caffeine in a can.
Both brands contain levels of caffeine that are well within the range recommended by EFSA (200mg of caffeine per serving and a maximum of 400mg of caffeine in a day).
Of the two options, however, Red Bull has lower caffeine content.
Sugar
For sugar, Relentless has 24g in a can whereas Red Bull has 27g in it.
While both remain within NHS guidelines for a 30g limit of free sugars daily, Red Bull has the higher sugar content among the two.
If minimising sugar intake is your aim, then you would want to choose Relentless over Red Bull.
Price
On Amazon, I found Relentless being sold at £1.66 per can whereas Red Bull was priced at £1.89 each. These prices are excluding shipping costs.
Assuming shipping costs were not a concern, then Relentless would be the cheaper option.
Relentless vs Monster
Caffeine
While Relentless has 160mg of caffeine per can, Monster has 179mg of caffeine instead.
You’d still be staying within the EFSA’s recommendation of 200mg per serving when you consume either brand.
Sugar
As for sugar content, Relentless has 24g of sugar whereas Monster has 54g of sugar.
This equates to 4.8g of sugar in every 100ml of Relentless and 11.4g of sugar for every 100ml of Monster.
You could say that Monster has more than double the amount of sugar you’d find in Relentless.
If you’re aiming to curb your sugar intake, Relentless would be the better choice for you.
However, both brands also have sugar-free options (Relentless Zero and Monster Absolutely Zero), and you can consider them if it suits your dietary needs better.
Price
Based on what I saw on Amazon, you would be able to buy a can of Monster for around £1.70, and for a can of Relentless, it would be about £1.66.
In terms of price, Relentless Energy is the cheaper option.
Relentless vs REIZE
Caffeine
In order to make a comparison between Relentless and REIZE, we’ll need to go by the assumption that you’ll be mixing 250ml of liquid with 1 sachet of REIZE energy powder.
With this in mind, we can see that Relentless offers 160mg of caffeine per 500ml and REIZE gives you 50mg of caffeine in 250ml.
If a stronger energy drink is what you’re after, then go for Relentless. Otherwise, REIZE would be the better choice to keep your caffeine consumption in a sensible range.
Sugar
For sugar content, Relentless has 24g of sugar in a 500ml can for all of its flavours except for Relentless Zero, which is sugar-free.
As for REIZE, it’s entirely sugar-free.
So, on the basis of sugar content, either brand would be fine since both have a sugarless option available for you.
Price
Relentless retails for about $1.29 per can excluding shipping, while REIZE is only around $1 inclusive of shipping right to your door.
Therefore, REIZE is the better option, price-wise.
How much taurine is in Relentless?
Relentless Energy contains 0.4% of taurine.
I think this amount in a can of energy drink is not enough to reap the benefits of taurine. A healthy person needs 400mg of taurine per day and more for potential health benefits.
To understand better why taurine is used in energy drinks like Relentless, read this article.
Alternatives to Relentless Energy Drink
In addition to the brands we already discussed above, you may also want to try:
Or if you like powdered energy drinks more, then you could check out these brands:
- G Fuel
- Zipfizz
- Advocare Spark
- REIZE (the best option)
REIZE
Besides being sugar-free and containing a reasonable amount of caffeine, REIZE contains a host of energy-boosting ingredients such as taurine, ginseng, and B vitamins.
This powdered energy drink comes in compact sachets, making it a really versatile option. You can easily carry it around with you and mix it with any beverage of your own choosing.
While it is generally recommended that you mix one sachet of REIZE energy powder with 250ml of water, you can always adjust the volume of water you use to make your drink as diluted or concentrated as you like.
Besides that, REIZE only costs about $1 per sachet and this includes shipping costs. I’d say it’s definitely a better deal than Relentless Energy!
Give REIZE a go and experience how good it is for yourself.