SlimJOY NightBurn XXL

Updated May 22, 2019.
Published Oct 18, 2018.

NightBurn XXL by SlimJOY is marketed as part fat burner, part digestive aid, and part sleep tonic. The product is sold as sachets of lime flavoured powder that you mix with water. The effect is really geared more towards the sleep aspect than weight-loss, and even that isn’t particularly potent. NightBurn XXL is also outrageously expensive, with each serving costing £2.60 once you’ve factored in delivery charges.


  • Backed by a 30-day money-back guarantee
  • Manufacturer clearly labels ingredient quantities on the pack
  • Relatively unlikely to cause side effects


  • Relatively unlikely to help customers to lose any weight
  • Extraordinarily expensive
  • Manufacturer has acquired a reputation for incompetence and poor service
SlimJOY NightBurn XXL
It is sometimes said that sleeplessness can lead to weight gain. Not only can a foggy and sleep-deprived mind struggle to count calories or exercise, but a tired body’s metabolism can also actually work against you. Some studies suggest that a lack of sleep is associated with a spike in cortisol, which essentially means that the body hangs on to fat stores in order to energise the body during daylight hours. If only there was a supplement that could deliver a restful night’s sleep, whilst also burning those stubborn fat stores…

Below we take an in-depth look into SlimJOY NightBurn XXL, to see whether this interesting combination of a herbal sleep aid and weight loss supplement can help to tackle this frustrating issue.

SlimJOY NightBurn XXL Overview

What you need to know about SlimJOY NightBurn XXL

SlimJOY NightBurn XXL is a supplement that claims to act as a fat burner, digestive aid, and herbal sleep tonic. Customers are given small sachets of powder that are designed to be mixed with water to make a lime-flavoured drink. If the product is then consumed directly before bed, it supposedly relaxes the body and quietly burns fat overnight.

What are the side effects of SlimJOY NightBurn XXL?

SlimJOY NightBurn XXL is unlikely to cause side effects, although some customers may experience mild nausea, drowsiness, dizziness, and headaches.

How much does SlimJOY NightBurn XXL cost?

As each pack only contains 10 sachets, SlimJOY NightBurn XXL is shockingly expensive. A 10-sachet pack costs £20 from most outlets (plus £4.90 in shipping costs on the official SlimJOY website).

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SlimJOY NightBurn XXL Key Features

SlimJOY NightBurn XXL is a lime-flavoured drink that is designed to be consumed shortly before sleep. The manufacturers claim that it can help customers lose weight through fat burning and suppressing the appetite, as well as deliver a more restful and satisfying sleep. It is also stated that deeper sleep has the effect of burning more fat, making the “night-time” action of this product more efficient than other similar weight loss drinks.

SlimJOY NightBurn XXL Key Points

  • Manufactured by SlimJOY
  • Contains 10 sachets per box
  • Weight loss drink that is designed to be taken directly before bed

NightBurn XXL is produced and sold by SlimJOY, a brand operated by a larger company called Sensilab. The Sensilab group traces its origins back to a research and production facility in Poland, although the modern-day incarnation of the company is based in Slovenia. The company now operates multiple brands and maintains a presence in 35 countries. If customers need to contact the company with queries related to this product, it’s best to contact your local SlimJOY team. The UK office can be reached at [email protected] and the Irish team can be reached at [email protected]

How to Take SlimJOY NightBurn XXL

The directions for use are as follows:

  • The recommended daily intake is 1 sachet dissolved in a glass of water before sleep

SlimJOY NightBurn XXL Concerns:

  • Very expensive when considering the small number of sachets per box
  • Manufacturer has received highly negative feedback in customer reviews
  • Unlikely to work as advertised

What does SlimJOY NightBurn XXL claim to do?

SlimJOY NightBurn XXL is designed to work as a weight loss and sleep aid, to be consumed directly before bedtime. The manufacturers claim that it has a distinctive “quadruple effect”:

  • It improves sleep quality (which is said by the manufacturers to also intensify fat burning)
  • It suppresses the appetite for late-night snacking
  • It speeds up the process of digestion, which “ensures a flat tummy”
  • It helps to reduce fatty deposits in the liver so that the liver can regenerate and have “a good night’s rest”

The manufacturer also claims that the expected weight loss results will be dramatic; the combination of fat burners and sleep aids will supposedly help customers lose weight “three times faster” than they ordinarily would.

Does SlimJOY NightBurn XXL work?

There is not much reason to suppose that this product would work as advertised. The bulk of the ingredients found in the powder are actually geared towards relaxation, inducing sleepiness, and improving mood/focus. On this count, the drink may work to deliver a restful night’s sleep, although it must be added that there are far more effective herbal sleep aids out there that cannot be found in SlimJOY NightBurn XXL.

The weight loss mechanism is almost laughably absent. The manufacturers appear to be relying almost entirely on garcinia cambogia to act as the magic bullet to burn fat, regenerate the liver, and induce weight loss. The problem is that garcinia cambogia is regarded as a poor and unreliable fat burner, and it is unlikely to deliver dramatic results on its own.

The use of inulin and corn dextrin may suppress the appetite, although it must be mentioned that it seems strange to advise customers to suppress their own appetite directly before sleeping.

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SlimJOY NightBurn XXL Ingredients

The ingredients found in SlimJOY NightBurn XXL are listed below. The quantities listed are correct for 1 sachet of powder.

  • Chicory Inulin with 86% soluble dietary fibres 3000mg: Some preliminary studies have shown that fructooligosaccharides (or FOS, a carbohydrate found within inulin) aid weight loss by increasing the perception of fullness following consumption. Studies have focused upon FOS sourced from Yacon Syrup, and the amount of weight that participants lost was undisclosed by the researchers. Another study supplementing this product was found to cause a small amount of weight loss over a 12-week period. As a prebiotic, inulin may also support a healthy immune system and relieve digestive problems. Source
  • Corn Dextrin with 82-88% soluble dietary fibres 2000mg: This dextrin is produced when cornstarch is subjected to heat. It is indigestible, meaning that it could theoretically function as an appetite suppressant or as a prebiotic that could improve gut health, but there is no strong evidence available to confirm that it has any positive effect on humans. Source
  • Calcium L-Pidolate (calcium) 200mg (25% NRV): Studies have shown that calcium can play a significant role in weight loss, especially loss of fat mass. Research shows that fresh dairy sources of calcium are more effective than supplementation. The amounts that are included in this product may only make a minimal difference to dieting attempts, as studies in humans showed weight loss results when consuming 600mg of calcium in addition to that found naturally in their calorie restricted diet. Source
  • Tri-Magnesium Dicitrate, anhydrous (magnesium) 187.5mg (50% NRV): Magnesium is one of the electrolytes that our body needs to function properly, although it is often expelled from the body through urine and sweating. Magnesium is used for over 600 functions in the body, and so it is certainly important to get enough, ideally through diet. Some studies suggest that magnesium supplementation could enhance exercise performance and mental performance. Source
  • Garcinia Cambogia extract with 60% hydroxycitric acid 800mg: Test tube and animal research suggest that HCA, the active compound in Garcinia Cambogia, may be helpful in weight loss because of its effects on metabolism. However, numerous studies in humans have found it has no effect upon either appetite or metabolic rate. Source
  • Choline Bitartrate 400mg: Choline supplementation appears to improve attention, and could improve memory, although the relevant study focused upon the elderly only. Choline is required to make increased levels of acetylcholine in the brain, which is a neurotransmitter that is linked to improved learning, memory retention, and recall. Athletes sometimes supplement various forms of Choline to delay fatigue and improve endurance, but there is little evidence to support this. Source
  • Elderberry Fruit extract 280mg (with 50% vitamin C – 140 mg (175% NRV)): This ingredient is a source of antioxidants, specifically flavonoids which could benefit the body’s immune system. This perhaps explains why they were used in folk medicine to treat colds and flu. Source
  • Lemon Balm leaf extract with 15% hydroxycinnamic acid and 7% rosmarinic acid 200mg: The chemicals in lemon balm appear to have a calming effect when consumed. Supplementation of lemon balm could act as a treatment for anxiety, stress, agitation in Alzheimer’s patients, and sleep problems. Source
  • Chamomile Flower extract 100 mg: This herb may aid relaxation and sleep. It has also been used as an effective heartburn and diarrhoea cure. Source
  • Vitamin B6 5.6mg (400% NRV): Vitamin B6 has several important functions in the body, including ‘allowing the body to use and store energy from protein and carbohydrates in food’. Whilst taking excess amounts of vitamin B6 will not infinitely improve this ability, a deficiency could make it more difficult to lose weight. Source
  • Natural Lime flavour
  • Lemon Fruit concentrate powder
  • Acidity Regulator: Citric Acid
  • Anti-Caking Agent
  • Rice Concentrate
  • Sweetener: Sucralose

SlimJOY NightBurn XXL Side Effects

A few of the ingredients found in this product could cause side effects, although the overall risk of experiencing side effects should be regarded as low.

Garcinia Cambogia can cause some side effects including nausea, digestive tract discomfort, and headache. Chamomile can cause drowsiness and in large doses can cause vomiting.

Lemon balm can very occasionally cause issues, including nausea, vomiting, dizziness, and wheezing.

One final concern is that the formula uses a needlessly high dose of Vitamin B6 – although this ingredient is not thought to be harmful in normal circumstances, such a large quantity can cause flushing, brain and nerve problems, vomiting, loss of appetite, headaches, tingling, and sleepiness.

Caution: Not suitable for pregnant or breastfeeding women. Not suitable for anyone under the age of 18. If you are taking any medications or are unsure about the suitability of this supplement for you, consult your doctor before purchase.

SlimJOY NightBurn XXL Customer Feedback

Unfortunately, we were unable to find any customer reviews discussing SlimJOY NightBurn XXL online. However, there were a few comments made about the SlimJOY brand on the UK’s Trustpilot service. Many of these were negative, implying that SlimJOY is often late with deliveries, sell substandard products, and make frequent dispatch errors. The overall rating of SlimJOY UK on Trustpilot is just 2.2 out of 5.

I ordered the product 3/4 weeks ago and I still haven’t received it

Don’t see a difference to be honest, disappointed in the product

Rubbish took my money and I never received the goods

I have been using a lot of Slimjoy products and have been impressed with the results

SlimJOY NightBurn XXL Money-Back Guarantee

Any SlimJOY product can be returned for a full refund, even if the pack has already been opened and partially used. However, customers have to follow a set procedure. They must first retain the invoice that was sent with the original package, and must download and fill out a special returns form before posting the pack back. Only the price of the product is refunded (not shipping).

Where To Buy SlimJOY NightBurn XXL

SlimJOY NightBurn XXL is available to buy on official SlimJOY websites, Amazon, Vitalobo, and several other independent online retailers.

Watchdog Verdict

Although the concept behind SlimJOY NightBurn XXL is interesting in theory, there really is no reason to think that this formulation works at all.

Although the ingredients list contains one or two herbal ingredients that could aid digestion or relaxation, the manufacturers rely entirely on garcinia cambogia for that crucial fat-burning mechanism. The problem? Garcinia cambogia has been repeatedly proven to be one of the world’s least impressive and most unreliable fat burners. It simply can’t be relied upon to deliver impressive results on its own, so it remains highly likely that this product does not work in the advertised way.

This is a hard pill to swallow when you remember that this product has to rank as one of the most expensive of its kind. When factoring in delivery costs, each sachet/serving of NightBurn XXL costs an eye-watering £2.60.

Customer reviews indicate that SlimJOY often fails to deliver packages on time and tend to make shipping errors, which could compound the misery from all angles.

Overall, we would suggest sticking with the individual fat burners and sleep aids that work for you, and stay well away from this poor-quality hybrid effort.

We do not recommend SlimJOY NightBurn XXL to our readers.

How does SlimJOY NightBurn XXL compare to Phentaslim?

CriteriaSlimJOY NightBurn XXL ComparisonPhentaslim comparison
Clinically Proven Ingredients
Side Effect Free
Positive Customer Reviews
24/7 Support
Money-back Guarantee

Disclaimer: Our reviews and investigations are based on extensive research from the information publicly available to us and consumers at the time of first publishing the post. Information is based on our personal opinion and whilst we endeavour to ensure information is up-to-date, manufacturers do from time to time change their products and future research may disagree with our findings. If you feel any of the information is inaccurate, please contact us and we will review the information provided.

Have Your Say

3 comments on 'SlimJOY NightBurn XXL'

  1. Love night burn is great i have loss 1st in a month hope its comes back fast and i had a great night sleep

  2. This has not helped sleep in any way infact I spent most of the night awake with pains in my stomach.not been on It long enough to notice weight loss.but I will not be buying any more .I will diet sensibly an waste no more money

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