This week, I obsessed over every aspect of the weight-loss drink Celsius, so we examined the ingredients, side effects, clinical research and quality of customer service. We scoured hundreds of consumer comments and reviews. We then refined and summarized to give you the info you need.
What is Celsius?
To start off with, Celsius is a weight-loss and energy drink that contains:
When you consume one per day, it will supposedly helps you increase energy. A benefit is you can consume it on the go.
The product, introduced in 2004, uses some natural ingredients, which is a good choice. You can buy the drink at retail stores, but you can’t order it from the official website. We like that there are some people who’ve had positive experiences and the company has been around a while.
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We reviewed Celsius ingredients in order to give you the facts you need.
Green tea is produced from the Camellia sinensis plant. It is prepared through steaming instead of fermentation, which is why is it considered healthier than black and oolong tea.
Green tea is apparently useful for mental alertness, thinking, cancer, depression, liver disease, stomach issues, athlete’s foot, and much more.
Research shows that green tea may be quite beneficial for weight-loss. In their study, published in Clinical Nutrition, researchers noted that, “12 weeks of treatment with high-dose green tea extract resulted in significant weight loss, reduced waist circumference, and a consistent decrease in total cholesterol and LDL plasma levels without any side effects or adverse effects in women with central obesity.” <
Guarana got its name from the infamous Guarani tribe, when they used certain seeds to brew a special drink. Now, the same guarana seeds are still used for medicines.
Guarana seed extract is used as ailments for many health problems, including low blood pressure, fatigue, pain, heart stress, and more.
In 2006, a study was published in the European Journal of Medical Research regarding the effects of guarana.
In their conclusion, the researchers stated, “A change in some outcome measures like: weight, BMI failed to produce significant difference between groups.” Additionally, this was measured through the use of a supplement containing other herbal supplements. 
Green tea catechins had significantly reduced body weight and had assisted in maintaining body weight following a period of weight-loss (microcirc=-1.31 kg; P<0.001).
Suppression of this effect by participants with high habitual caffeine consumption (>300 mg per day) had not achieved significance (microcirc=-0.27 kg for high caffeine intake and microcirc=-1.60 kg for low regular caffeine consumption; P=0.09).
A similar effect was noticed from catechins in Caucasian participants (microcirc=-0.82 kg) when compared to Asians (microcirc=-1.51 kg; P=0.37) but had not been significant enough.
Epigallocatechin gallate-caffeine combination had a minor positive effect on weight-loss and weight management.
In conclusion, the results had indicated habitual caffeine intake along with ethnicity could all be factors in influencing catechin effects. 
Ginger is a plant originating in warmer areas of Asia, Africa, and South America. It is often used as a spice, as well as various medicines in the Middle East.
Ginger is known to help reduce inflammation and nausea. It has also been marketed as a laxative.
A recent study was published in the European Journal of Nutrition evaluating the effects of ginger on weight loss.
In the conclusion of the article, researchers stated that, “In conclusion, our findings demonstrate a minor beneficial effect of 2g ginger powder supplementation for 12 weeks on weight loss and some metabolic features of obesity.”
There has been a very well documented account of ginger and its anti-cancer properties due to its functional ingredients (gingerols, paradols, and shogal) which help prevent a variety of cancers.
The study had concluded citing gingers favorable traits, but some ambiguities made the need for further research necessary. 
Chromium is an essential trace mineral founds in various foods and supplements. This should not be confused with hexavalent chromium, which is a known toxin.
Chromium is thought to help normalize blood sugar levels by controlling the use of insulin in the body.
In an article from the University of Maryland Medical Center, there is discussion about the possible benefits of chromium in weight-loss, saying, “Studies have been mixed, with some finding that chromium may help people lose weight and build muscle, and others finding it has no effect.”
For pancreas, larynx, esophagus, and oral cavity cancer, the evidence for a shielding effect of vitamin C and accompanied components is significant and consistent.
For stomach, breast, rectum, and cervix cancer, the evidence is just as strong.
An array of lung cancer studies had discovered significant protective activities of vitamin C. I
t is possible that carotenoids, ascorbic acid, and other fruit traits work together.
Raising intake of fruits and vegetables are encouraged. 
Nicotinic acid has been found to have favorable activities toward lipids and lipoproteins, giving it the ability to become an alternative to fibrates for treating mixed hyperlipidemia patients.
Niacin may also be used either by itself or combined with other agents.
Niacin has been employed in a plethora of various dyslipidemias.
There needs to be a larger clinical trial with the inclusion of placebo to thoroughly verify its effects. 
It was found that individuals who consumed a high amount of caffeine experienced weight loss, fat mass reduction, and waist circumference decrease more so than those who intake moderate volumes of caffeine.
There had been less of a reduction of resting energy expenditure along with the reduction of respiratory quotients during weight-loss (p < 0.01).
In moderate caffeine intake individuals, during weight management, green tea had still decreased body weight, waist, body fat, and respiratory quotient, and resting energy expenditure had been raised in comparison to the restoration of the variables with placebo (p < 0.01).
High caffeine intake users experienced no difference in weight management with intake of green tea.
It had been concluded that high caffeine intake was associated with weight-loss via thermogenesis and fat oxidation. 
Celsius Side Effects
The first concern we have involves Celsius side effects, which may include jitteriness and stomach concerns. “Energy drinks contain stimulants, that’s often the nature of the formula,” said our Research Editor. “It’s how much is included that can mean the difference between a good punch and a jolt that doesn’t feel so positive.”
“Once I drank Celsius, I immediately felt jittery which I felt was odd,” said a consumer of Celsius ingredients.
“I was suffering headaches, muscle twitches and even a flutter in my chest,” reported another.
Side effects are different from one person to the next. According to one dieter, “I have no shaky after effects, no queasy stomach.”
We also found one that said, “Tastes nice and does not make you jittery.”
Taste of Celsius
According to some customer comments, the taste of Celsius wasn’t right. Some commented that the beverage tasted flat. “To me it tasted flat and artificial and all around not good,” said a customer.
“This tastes nothing like mango or peach (not to us). I can’t even describe the taste,” explains a dieter.
“So nasty tasting had to dump the majority of the cans down the sink,” commented a user.
Products like Celsius will always have some consumers who like them and some who don’t. One person who had a positive experience said, “It tasted kind of weird at first but I got used to it real quick and now I look forward to drinking them.”
Another shared, “It has a good taste and helps to boost your energy.”
Our research shows it takes just a small part of a weight-loss program, like side effects, to hamper chances of long-term success. If Celsius leaves dieters feeling jittery, they may not continue using the product.
The Science – “Clinical Evidence?”
There are links to clinical studies supporting certain claims made by Celsius. What interested us the most was the “Weight Loss Effect in Overweight Women” paper. This one doesn’t come with a link to the journal where it was published. Even better is the participants “reported to a training facility” on workout days. The average dieter doesn’t have access to this type of exercise routine. The science is lacking with Celsius and at DietSpotlight that’s what’s most important. If there’s no proof a product works, there’s no real reason to spend the money. 
What Users Are Saying
“Favorite pre-workout drink. Energy boost without the sugar rush. Tastes great!”
“These are OK. The taste is kind of medicinal, the little caffeine boost equals a Red Bull or Monster, I’m sure they don’t actually help one burn more calories though.”
Also: read our Burn HD Weight-Loss Kit review »
“I ordered this based on reviews, but it’s icky. It’s got a chemical kind of taste. I really can’t imagine anyone enjoying this drink.”
The Bottom Line – Does Celsius Work?
Well now, the verdict is in on Celsius, so what did we find? There are positives, including a few good customer comments and the fact that it has natural ingredients, but we have some reservations because the research performed was not realistic for the average dieter. We are also concerned about potential side effects and bad taste.
If you’d like to slim that waistline, we recommend going with a product that with ingredients backed by published clinical studies that aren’t there to make you feel worse for the wear.
Among the best products we’ve seen this year is one called Burn HD. The formula consists of a four-ingredient blend, all clinically-tested with results often located in publications such as The American Journal of Clinical Nutrition and the Journal of Medicine.
Additionally, the team behind Burn HD are offering a 2-Week Sample, which is a great sign.Learn More About Burn HD »