It’s the cult drink that kids everywhere have become obsessed with.
But Prime energy drinks, the brand owned by YouTubers KSI and Logan Paul, can have up to 140mg of caffeine.
This makes the £1.99 drink nearly twice as potent as rival Red Bull, and even more caffeinated than a double espresso.
Experts say the beverage’s high caffeine content could lead to a rapid heart rate, disturbed sleep and anxiety.
It comes after a child suffered a ‘cardiac episode’ and needed their stomach pumped after drinking Prime Energy, leading a school to issue a warning this week to parents about the drink’s ‘harmful effects’.
A can of Monster energy drink contains 160mg of caffeine and a can of Rockstar contains 200mg — double the amount of a cup of instant coffee
The Prime energy drink comes in several flavours, contains 140mg of caffeine and is sugar free
Prime was launched by YouTube icons KSI and Logan Paul last year. The pair have millions of followers online.
Social media hype around the products led to it quickly selling out in supermarkets, leading to massive queues and rules on how many each customer could buy.
Demand has saw scuffles break out in the aisles, bottles selling for as much as £100 and prompted muggings and near-riots in shops.
There are two versions available – Prime Hydration is caffeine-free, sold in a bottle and comes in flavours including Orange, Grape and Ice Pop.
Prime Energy is sold in a can, with flavours including Orange Mango and Strawberry Watermelon. Containing high levels of caffeine, it hit shelves at the end of April.
However, the company does say the drinks are not recommended for under-16s and UK supermarkets have imposed their own rules stopping his cohort from buying any energy drink.
Dr Deborah Lee, from Dr Fox Online Pharmacy, previously said: ‘I would not recommend children drink Prime energy drinks or other energy drinks for children of any age.
‘Children don’t need energy drinks anyway – they have plenty of energy. If your child is lacking in energy take them to see their GP – do not give them an energy drink.’
Dr Duane Mellor, a dietitian at Aston University, told MailOnline: ‘The issue is in children, especially smaller children, the large amounts of caffeine in energy drinks for their body size is far greater than it would be for an adult.’
But it’s not just Prime energy that contains dangerous amounts of caffeine for children.
A can of Monster energy drink contains 160mg and a can of Rockstar contains 200mg — double the amount of a cup of instant coffee.
This new infographic by Peronalise.co.uk looks at what happens to your body after drinking an energy drink
NHS guidelines say around 400mg of caffeine a day is safe for adults, the equivalent of four regular cups.
Pregnant women are advised to consume around half that, while the recommended limit is around 100mg for teens.
But experts say caffeine is not suitable for children.
‘The reason caffeine is not recommended for children is that in some individuals it can increase high rate, make them anxious or agitated and negatively affect sleep which can result in behaviour issues,’ said Dr Mellor.
He added: ‘The law is clear that warnings should be placed on all energy drinks which are defined as containing more than 35mg/l of caffeine.
‘These must also be labelled with a warning that they are not suitable for children and pregnancy or breastfeeding women, perhaps these warnings are not clear enough.’
Yet, a survey last year by Good Morning Britain found a quarter of children aged eight to 16 chug one or more of the high sugar and caffeineated beverages on a school day.
Doctors also say they can contain up to 21 teaspoons of sugar, making children who drink them more prone to putting on weight.
In a can of Monster there is 55g of sugar, in Red Bull there is 11g per can and in Rockstar there is 21g of sugar.
This is a huge chunk of a child’s recommended daily sugar with the NHS advising children between seven and 10 should have no more than 24g of free sugars a day.