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USN CLA Thermo

It is claimed that UCN CLA Thermo will help you to lose weight by a thermogenic reaction created by the ingredients that make up the supplement. Evidence to support this claim is not strong.

Below we have reviewed USN CLA Thermo against our review criteria to help consumers make an informed decision.

USN CLA Thermo Pros
  • Contains some ingredients, such as green tea, that have been studied
  • Company is well established
  • Available from a range of stores
USN CLA Thermo Cons
  • Little scientific evidence to back up the claims of the manufacturers
  • Side effects could be severe for some individuals
  • No money-back guarantee or diet plan

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USN CLA Thermo Review

The company USN is responsible for a large range of products, a number of which are endorsed by celebrity athletes and sports teams. USN CLA Thermo is advertised as a weight loss supplement that should increase fat burning. The product as a whole has not been subject to any clinical testing though, so this statement cannot be verified.

Claimed weight loss benefits

The manufacturers claim that thermogenic effects can be experienced by taking their products, so this may mean that the product works by boosting the metabolism and burning fat – two potential benefits of thermogenesis. We cannot see that there are any claims of appetite suppression or carbohydrate blocking, and a diet plan is not provided with the supplement.

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How USN CLA Thermo Works


According to what the manufacturers tell us, CLA Thermo is to be used as a weight loss product, and does not have any body building effects like some of the rest of the USN range. They say that a thermogenic reaction is created within the body as a result of the ingredients that are used in the supplement, and it will also increase concentration and alertness as well as reducing tiredness and fatigue.

Safflower Oil

Safflower Oil, included because of its CLAs, is one of the main ingredients. It has not been researched for weight loss, but may help with constipation.


Similarly, cocoa has been linked with weight loss in the past, though this potential has not been proven in scientific studies. It has been suggested that cocoa can boost the metabolism, particularly as the ingredient contains a small amount of caffeine.

Rhodiola Rosea

Rhodiola Rosea is also known as Roseroot, and may help with athletic performance – though the reports are conflicting in this area.

Yerba Mate

Next up is Yerba Mate. This ingredient is thought to aid weight loss by boosting fat burning and suppressing the appetite. It is a stimulant ingredient and so might increase the heart rate and blood pressure.

Green Tea

Finally, green tea is understood to have some effect on weight loss through boosting the metabolism. This is thought to be thanks to its catechin content – particularly EGCG. The caffeine present in green tea might also have a slight impact on the metabolism.

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Key USN CLA Thermo Ingredients


There are quite a lot of ingredients listed with this diet pill, made more complicated by the fact that the official website only mentions a small amount of them in the ingredients list and puts the others into an information tab. However, once you track down the full list, you can pick out the key ingredients from those that are only included to help form and shape the pills.

Safflower Oil

Safflower oil is promoted as one of the main ingredients because of the fact that it contains conjugated linoleic acids, but no clinical trials have suggested that the ingredient will have significant weight loss effects.

Rhodiola Rosea

Rhodiola Rosea is also known as roseroot and is likely to have been included because of rumours that it may help with athletic performance, though this has not been found in clinical trials.

Yerba Mate

Yerba Mate is a natural ingredient that is taken from part of a plant, and while it may help with weight loss in some areas, it has been stated that the ingredient might only be beneficial when consumed with other substances. Yerba mate contains caffeine and so might act as a stimulant.

Green Tea

The last of the key ingredients is green tea, which is obtained from the Camellia sinensis plant. The ingredient is said to help to boost the metabolism, which could help with weight loss when you are also exercising or following a healthy diet plan.

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Clinical Studies

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Clinical studies are carried out in controlled environments in order to find out exactly what certain ingredients can do, and are more reliable when carried out on human participants on more than one occasion.

Rhodiola Rosea

Rhodiola has not been associated with weight loss in clinical studies, but has been explored for athletic performance enhancement. One study used a series of double blind, placebo controlled trials to test the effects of the ingredients on endurance performance. It was found that Rhodiola rosea could increase time to exhaustion, therefore improving endurance exercise capacity. Another study however, found that Rhodiola rosea had no significant impact on muscle energy use or exhaustion when compared to a placebo.

Yerba Mate

Clinical evidence for the weight loss effects of yerba mate is not strong. One study has indicated that the ingredient could be beneficial for weight loss, but this was when it was consumed in combination with guarana and damiana. A study in mice has suggested that yerba mate might boost energy expenditure and metabolism.

Green Tea

Clinical studies have also been done into green tea, which is an extract that is quite regularly used in weight loss supplements. One study has suggested that green tea can aid weight loss by stimulating thermogenesis in obese patients. A second study used mice as subjects and concluded that green tea supplementation could prevent body weight gain and fat accumulation. The authors attributed this effect to the catechins and caffeine present in green tea extract.

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USN CLA Thermo Side Effects

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The side effects that we have found associated with the ingredients in USN CLA Thermo raise some potential concerns as they could end up being quite strong, particularly in the long term. Both immediately and in the future, the various side effects may include: nausea and vomiting, gas, stomach cramps, diarrhoea or constipation, dizziness, weakness, rectal bleeding, allergic reactions, dehydration, bloating, headaches, thirst, nervousness, sleeplessness, increased or interrupted heartbeat, jitteriness, migraines, liver problems, tremors, heartburn, convulsions, and confusion. Those who have a low tolerance for caffeine would experience many of these side effects in a more severe way than those with a high tolerance, and it is also likely that the severity of the side effects would increase over time as you continue to take the supplement.

Safflower Oil

Safflower Oil can cause an allergic reaction in some people, and can slow blood clotting, so be careful of this and mindful of your own personal medical conditions.


Cocoa is likely safe for most people, but it does contain caffeine (as does green tea), which means you could experience nervousness, sleeplessness, a faster heartbeat, and jitteriness. It can also cause migraines, constipation, allergic reactions on the skin, gas, and nausea.


Rhodiola is thought to be safe for use in the short term, but the long term effects are not known.

Yerba Mate

Side effects for Yerba Mate include such possibilities as those connected with caffeine, as well as an increased risk of mouth, esophageal, laryngeal, kidney, bladder, and lung cancer.

Green Tea

Finally, green tea is well explored in terms of side effects: it can cause issues such as stomach upsets, constipation, liver problems, headaches, nervousness, sleep problems, vomiting and diarrhoea, irritability, irregular heartbeat, tremors, heartburn, dizziness, convulsions, and confusion.

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How to Use

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The advice from the USN website is that you should take just one softgel capsule at a time, two or three times a day, just before you eat a meal. They also recommend that you drink a large amount of water to ensure that you stay hydrated, with eight to ten glasses recommended. They give the normal recommendations which are advised when taking any diet pills: engage in healthy exercise and training, maintain a balanced diet which gives you plenty of energy, do not take them if you are under eighteen or pregnant (or breastfeeding), and stop taking it if you experience severe side effects. In addition, you should check with your doctor before starting to take them if you have a pre-existing medical condition.

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Who Makes It?

The company that makes USN CLA Thermo is USN, which stands for Ultimate Sports Nutrition. They have a comprehensive website, which lists all of the information that you might need in regards to the various products that they sell, including a number of other supplements for weight control, body building, and lean muscle, as well as protein shakes, multivitamins, protein bars, workout equipment and apparel, and electrolyte drinks.

They clearly have a leaning more to the fitness side of things than just pure weight loss, but if you are interested in getting fit and building muscle as well as losing weight then they might have a relevant range of products. They also have endorsement deals with a number of athletes and sports teams, particularly within the US and UK. This includes several fitness models and bodybuilding champions, and teams such as the Birmingham City Football Club, Great Britain Bobsleigh, Gloucester Rugby, and Welsh Cycling.

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Where to Buy USN CLA Thermo


The USN website has several options in terms of the size and the price of the capsules in this case, starting from £16 for one bottle of 45 capsules. You could upgrade to a bottle of 90 capsules, double the size, for a price of £28 (therefore saving yourself some money). If you go for the second option then you will also see free delivery to UK addresses, and there is also an offer to give you 20% off should you buy three or more bottles.

You can also save some money by shopping on Amazon, where you can see a bottle of 90 capsules for £18.99 plus a £1.99 delivery charge. This is supplied by Affordable Supplements rather than USN, and the bottle displayed in the image has an old label, so this is perhaps not as reliable as going right from the source. A number of other supplement based online stores also stock USN CLA Thermo, so you will be able to shop around if you would like to and find the site which has it in stock at the lowest price when you are looking.

Finally, if you are going to shop on the high street, then there is at least one option available to you. Holland and Barrett stock it in their UK stores at a price of £16.49 for 45 capsules, so you will not be saving much cash in this case, but you will not need to pay a delivery fee.

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Does USN CLA Thermo Meet our Approved Criteria

Money-back-guarantee: No. There does not seem to be a money back guarantee.

One-off payment: Yes, purchase of this product appears to be a one-off payment.

Manufacturing Standard: There is no mention of any official manufacturing standards.

Accompanying Diet Plan: There is no mention of a diet plan with this product.

Ingredients and quantities disclosed: An ingredients list is provided.

Company contact details readily available: Contact details are provided on the official website.

USN CLA Thermo does not meet our ‘Approved’ criteria as there is no money-back guarantee or diet plan and some information is lacking from the official website, including manufacturing standards.

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Overall Verdict

The company behind USN CLA Thermo is well established and sells a variety of health supplements. Contact details are available and an ingredients list is provided. There is however no money-back guarantee or diet plan. The product has not been clinically studied, though some of its ingredients have been subject to preliminary trials, the results of which are largely mixed and inconclusive. Stimulant-related side effects might occur, and this supplement is not suitable for all groups of people.

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