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How Many Relentless Can You Drink In a Day? (Detailed)

So you’ve started drinking Relentless and loved what the brand offers you. You’re energized, the drink is delicious, and the additional vitamins don’t hurt either.

But you’ve started drinking more and more, and now you’re worried that Relentless might eventually take its toll on you.

I recommend not exceeding more than one 500ml (16 fl. oz) can per day. Its high caffeine and sugar content make it unhealthy to be consumed more than once in a single day.

But then again, there are more factors to consider, so read on to know more details about the Relentless Energy drink!

What are the Ingredients Present in Relentless?

Relentless claims to add the following ingredients in their drinks:

Ingredient TypeIngredient
EnergisersCaffeine, Guarana Seed Extract
WaterCarbonated Water
PreservativesPotassium Sorbate, Sodium Benzoate,
Sodium Citrate
AcidCitric Acid
VitaminsTaurine, Niacinamide,
Pantothenic Acid, Pyridoxine Cobalamin
SweetenersSucralose, Sucrose
Flavour Enhancer Erythritol
ColourCaramel E150d
Ingredients found in Relentless

Nutritional Facts of Relentless

You may be wondering what the quantities of the ingredients present are, don’t worry, I’ve got you covered.

Relentless Ingredients
Nutritional content of a 500ml (16 fl.oz) Relentless drink
IngredientQuantity (Per 500ml)Daily Value (%DV)
(108 kCal)
(Excluding Sugar)
Pantothenic Acid8.5mg142%
Vitamin B61.5mg107%
Vitamin B122.0mg86%
Nutritional facts of Relentless Energy drink

How Much Caffeine is Relentless?

Relentless contains 160mg of caffeine in its regular 500ml (16 fl. oz) can.

The FDA advises people to not go above the 400mg of caffeine limit per day, so assuming you intake caffeine from other sources aside from Relentless, you can exceed the limit very easily.

The 160mg present in Relentless places the drink among some of the most highly caffeinated energy drinks. This high amount means you will see the results of the drink almost immediately after consumption.

An increase in alertness and a significant adrenaline rush should be expected. It will enable you to carry out strenuous tasks with minimal difficulty.

If you’ve had little to no intake of caffeine in the past, you might want to consider only gradually increasing the dose per day until you’re sure you can take Relentless, to be absolutely safe and to avoid any side effects.

How Much Sugar is in Relentless

Unlike other energy drink brands like Xyience, Moose Juice, and Bang, Relentless isn’t sugar-free.

Each 500ml (16 fl oz) can have 25g of sugar.

People with prior heart and other health conditions should consult with their doctor before drinking Relentless.

The American Heart Association (AHA) recommends women to have no more than 24g and men 36g of sugar per day.

If you’re a woman, Relentless will fulfil 100% of your daily sugar intake limit and for men, this amount is more than 70%.

This might cause health issues if you’re drinking Relentless frequently.

How Many Calories are in Relentless?

Relentless contains 108 calories per 500ml (16 fl.oz) drink.

The NHS declared that the maximum calorie intake for women is 2,000 a day and 2,500 per day for men.

While this amount doesn’t contribute to the daily limit as much as it does with sugar, it can still hinder if you’re on a calorie-restricted diet.

People who are looking to lose weight can consider other calorie and sugar-free energy drinks to add to their diets.

What are the Health Benefits of Relentless?

The main benefits of Relentless are its ability to make you significantly more alert, mentally and physically.

If the energy boost caffeine in Relentless is the reason you’re having the drink in the first place, other ingredients can also play a role in your welfare.

Relentless comes with several B-Vitamins, these include:

These Vitamins aid your body in burning fat into energy and maintaining the body’s red blood cells, these play a crucial role in transferring oxygen within the body, their deficiency could result in anaemia.

What are the Health Risks of Relentless?

If you have two or more Relentless drinks within a 24 hour period, you’re likely to suffer from the following caffeine overdose symptoms.

  • Hallucinations
  • Vomiting
  • Trouble breathing
  • Chest pain
  • Irregular or fast heartbeat
  • Uncontrollable muscle movements
  • Convulsions

If you have had prior health conditions or are a heart patient I would not advise you to have Relentless.

A caffeine overdose can cause high blood pressure and seizures, these can be fatal if you have a weak heart or suffer from any other disease.

Does Relentless Energy Drink Really Work?

Relentless Energy Drink contains caffeine and other ingredients that are known to provide a temporary boost in energy and mental alertness. These ingredients can help to reduce fatigue, increase focus and concentration, and enhance physical performance. 

Therefore, in the short-term, consuming Relentless Energy Drink can provide a boost in energy and performance. However, it’s important to note that the effects of energy drinks like Relentless are temporary and can vary depending on the individual’s tolerance to caffeine and other stimulants.

How Long Does It Take For Relentless To Kick In?

Typically, it can take around 30 minutes to 1 hour for the caffeine in Relentless Energy Drink to take effect and provide a noticeable boost in energy and mental alertness. However, some individuals may feel the effects sooner or later than this.

The time it takes for Relentless Energy Drink to kick in can vary depending on several factors, including the individual’s metabolism, tolerance to caffeine, and the amount of food consumed prior to consuming the drink.

How Long Does A Relentless Energy Drink Last?

Typically, the effects of Relentless Energy Drink can last for around 3 to 5 hours. During this time, the caffeine and other ingredients in the drink can provide a temporary boost in energy and mental alertness, reducing fatigue and increasing focus and concentration.

It’s important to note that the effects of energy drinks like Relentless are temporary and can vary depending on the individual.

What Should You Do If You Experience Relentless’ Side Effects?

If you notice that you’re suffering from one of the symptoms given above, immediately stop all consumption of any more caffeine.

Some common caffeinated products include chocolate, coffee, and tea. In comparison, these three products have relatively less caffeine in them.

Here are a few tips if you’re experiencing some side effects!

Drink plenty of water

The extra caffeine means your body will be working overtime to get it out of your system as soon as possible, this will result in you urinating a lot, to avoid adding dehydration to the list of problems, you should drink as much water as you can.

Take a walk

If you feel packed with a lot of pent-up energy, take a walk and try to rid yourself of some of it. Immediately stop if you feel your heart rate rising.

Replenish nutrients

If you’re urinating a lot, you’re also losing important nutrients. Drinks like Gatorade are specially made for this purpose, it would benefit you to have one.

But if symptoms persist, consult a medical professional immediately.

Can Everyone Drink Relentless?

Relentless is not for everyone, it is only suitable for healthy adults.

Teenagers and children are suggested not to have Relentless because the recommended daily intake of caffeine for teenagers is only 100g per day, Relentless contains a significantly larger amount of caffeine than this recommended limit.

Pregnant women should also avoid Relentless because drinking large amounts of caffeine can cause low birth weight or in extreme cases, miscarriage.

Breastfeeding women are also required to stay away from large quantities of caffeine to avoid affecting the child’s well-being.

If you’re someone who has prior heart conditions, you should consult a medical professional before consuming Relentless.

When to Drink Relentless?

Relentless Energy Drink
Relentless Energy Drink

As long as you are in need of an energy boost, you can drink Relentless anytime you want.

It can be used before a workout to boost your abilities or even taken after an afternoon nap to stop you from feeling sluggish.

However, you should try to avoid taking Relentless during the nighttime, this can affect your routine and make you reliant on supplements to fall asleep on time.

When Can You Drink the Next Can of Relentless?

After 24 hours have passed since your last drink, you can safely drink another can of Relentless.

Even though there shouldn’t be any immediate symptoms, you should try and only have Relentless once in a few days; this will eliminate the chances of you becoming dependant on caffeine.

What Will Happen if You Have Too Much Relentless?

Other than the immediate symptoms mentioned earlier, here are some things you should look out for in the long run if you are a regular user of energy drinks.

Some of the long term side effects of caffeine include:

Another potential source of problems most people overlook is the sugar present in Relentless.

A large amount of sugar in Relentless might cause you to face severe side effects, and these might include fatigue, high blood pressure, and joint pains.

The video below provides an in-depth explanation of the effects of extensive sugar consumption.

Alternatives to Relentless Energy

There are many energy drinks available online and in your local stores, many varieties which you can choose from if Relentless doesn’t go along well with your taste. Some of these energy drinks are:

Some notable mentions

Other energy drinks that offer similar benefits like Relentless are;


I recommend only have one can of Relentless per day; any more than that can cause you to suffer from several adverse health effects.

Relentless’ high caffeine content makes it suitable for only healthy adults. People with past health conditions can consult with a doctor and look for a more appropriate drink.

Whether you’re looking for an energy boost before a workout or hoping to study the whole night, Relentless can be the drink you’re looking for.

Check out its wide range of flavours and choose one which you like best!

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