Relentless ENERGY DRINK MANGO

Posted on March 3, 2021 | Last updated February 5, 2025

Relentless ENERGY DRINK MANGO
Released in September 2018 in the UK, this is Relentless' mango-flavored energy drink.

At first, I assumed it contained real fruit juice, but surprisingly, it doesn’t.
Despite being juice-free, it delivers the rich, juicy taste of mango, making it an underrated masterpiece.

Relentless ENERGY DRINK MANGO

Manufacturer	Energy Beverage
Country of Origin	UK
Price	1.49 GPB
Flavor	Mango
Total rating	★★★★★

Author information Author: Energy Drink-kun

In 2001, while living in the United States, I encountered energy drinks through the dance scene and was deeply impressed. After returning to Japan, I found that energy drinks were considered novelty beverages, so I established a comprehensive website in 2013 to share the true appeal of energy drinks. As an energy drink enthusiast, I began drinking them seriously again, collecting over 7,000 varieties of energy drinks from various countries. I am also active as a critic and expert, receiving media interviews.

A Surprisingly Rich Mango Flavor with No Juice

When poured into a glass, its cloudy golden hue looks just like real fruit juice.
The sweet, juicy mango aroma is so rich that I immediately expected it to be a juice-based energy drink.
Relentless ENERGY DRINK MANGO

The first sip reveals a smooth, sweet-and-tangy tropical mango flavor.
Wow, this is really good! (*´艸｀*)

Hints of orange, papaya, and rich peach add layers of depth, along with a slight thickness that gives it a luxurious, juice-like quality.

I was convinced it contained real fruit juice—until I checked the label.
To my surprise, it's completely juice-free! Σ(´∀｀；) The level of craftsmanship here is insane!

Even knowing it had no juice, I was amazed all over again when I drank my second can.
It’s that convincing! (^_^;)

Compared to heavy, juice-packed Monster Juices, this one may feel a bit lighter,
but the perfectly balanced texture, natural mango fragrance, and just the right amount of tartness
create an impressively realistic fruit experience.

And this mango flavor doesn’t stop at just great taste—let’s check out its energy components.

Relentless ENERGY DRINK MANGO's Energy Ingredients

Contains 160mg of caffeine and 2000mg of taurine. No fruit juice.
Fairly standard for an energy drink.
Relentless ENERGY DRINK MANGO

But here’s the real shocker:
A 500ml can contains just 24g of sugar—a half-sugar formula!
I had to double-check the label. Σ(´∀｀；)
Most energy drinks of this size contain around 60g of sugar,
yet this one delivers an incredibly rich mango taste with far less sugar.

If this level of flavor can be achieved with half the sugar,
then why would anyone want to go back to regular sugar-loaded energy drinks?

Unless you're an athlete, consuming excessive sugar outside of meals has little benefit.
So I really hope half-sugar, ultra-delicious energy drinks like this become the next big trend.

Relentless ENERGY DRINK MANGO's Design

The new design under Monster Energy's ownership features an orange background,
the R logo, and a large bird. Honestly… it looks terrible. (ヽ´ω`)
Relentless ENERGY DRINK MANGO

I wouldn’t be surprised if people stopped buying Relentless because of this redesign.
Especially for a drink as amazing as this mango flavor, losing potential buyers due to bad packaging is a real shame.

Relentless under Coca-Cola had a stylish and dark aesthetic.
But ever since joining Monster Energy, the brand's design has taken a nosedive.
Can we please break this curse of post-Monster ugly rebrands? (^_^;)