Let’s face it, the FDA has a limited role in regulating dietary products.
It allows manufacturers to put almost any (ineffective) ingredients in their products, while the FDA can only alert the public when an item is unsafe, falsely labeled, etc., and remove it from the market (which takes time).
Meanwhile, users may suffer from the consequences of dangerous, misleading marketing.
Hopefully, our reviews can help you make informed decisions and protect your health.
Let’s see whether Liquid Burn lives up to its promises.
What Is RSP Liquid Burn?
RSP Liquid Burn is advertised as an all-in-one fat-burning product containing natural flavors and a synergistic ingredient combination. It supports cellular health, enhances metabolism with its thermogenic L-carnitine matrix, burns fat, improves athletic performance, and shortens post-workout recovery.
Made in the United States by RSP Nutrition, it's supposedly designed to increase calorie burn and provide clean energy without jitters.
It supports healthy, natural weight loss to improve lean body composition (relying on three ingredients in effective doses).
Additionally, if you're a female, you can check out our list of the best fat burners for women.
Liquid Burn is one of the few thermogenic fat burners in a liquid form. It has a very short ingredient list to improve lean body composition by targeting your energy, focus, and metabolism.
Based on its product page, the specific benefits of Liquid Burn are:
- Increased metabolism and fat burning
- Enhanced athletic performance
- Improved recovery after workouts
- Better cellular health
The content of this weight loss formula includes L-Carnitine, Caffeine Anhydrous, Green Tea Extract, Water, Sucralose, Citric Acid, Acesulfame Potassium, Sodium Benzoate, Potassium Sorbate, Malic Acid, Natural Flavors, and Erythritol.
Here’s more info about the key compounds.
L-carnitine is an amino acid critical for transporting fatty acids into our cells, where they get burned to produce energy.
Research says that L-carnitine can prevent lactic acid buildup and enhance blood flow, supplying muscles with more oxygen, which translates to better endurance, reduced muscle soreness, and faster recovery after workouts.  
Besides supporting weight loss, L-carnitine helps the brain, heart, and other disease prevention. 
Some users say that it effectively burns extra pounds, but only if you are in a calorie deficit, meaning you should burn more calories than what you consume.
Caffeine Anhydrous (150mg)
But pure, highly concentrated powder or liquid caffeine forms can be dangerous.  Plus, it becomes less effective as you get used to high doses over time, so we recommend you opt out for caffeine-free pre-workout instead. 
Our clients find the amount of caffeine in Liquid Burn just enough to cause a significant energy boost without the nasty side effects.
Green Tea Extract (100mg)
It can also aid in preventing cell damage and protecting overall health.
Other products we've reviewed:
Pros and Cons
- Marketed as a natural fat-burning formula
- Claimed to boost metabolism, burn calories and fat, increase energy
- Liquid form promises better absorption
- Without sugars, carbs, calories
- Convenient for on-the-go usage
- Newly-launched product without enough information and real user testimonials to support the company’s claims
- Many people have complained its berry taste is too sweet, like cough syrup
- Positive reactions are more about feeling energized than losing weight
- Unsuitable for caffeine-sensitive people, vegans, and vegetarians
- It may contain some common allergens
Liquid Burn is new on the market without substantial evidence of its benefits and negative effects.
The manufacturer has warned potential customers that this product’s been produced in the same facility as other products containing tree nuts, soy, eggs, milk, (shell)fish, and wheat.
So, it can trigger allergic reactions, and it’s not vegetarian-/vegan-friendly.
Minors, pregnant, nursing women, and people taking any medications or other dietary supplements shouldn’t use this fat burner.
This fat-burning supplement also contains Caffeine Anhydrous, so a sensitive person should avoid taking it with other caffeinated products.
Excessive amounts of caffeine may cause increased heart rate, high blood pressure, irritability, insomnia, nervousness, and many other severe adverse reactions.
“Caffeine in powder or liquid form can provide toxic levels of caffeine, the U.S. Food and Drug Administration has cautioned. Just one teaspoon of powdered caffeine is equivalent to about 28 cups of coffee. Such high levels of caffeine can cause serious health problems and possibly death.” - Mayo Clinic
Based on online reviews, many users have experienced a huge energy boost for their workouts without any jittery feeling or crashes later on in the day.
Expert advice is not to use this product without consulting a health care professional.
I’d suggest picking a safer weight loss supplement, tried, tested, and proven to work.
How Do You Take RSP Liquid Burn?
RSP Liquid Burn should be taken once a day. It’s best to use one serving (one tablespoon or 15ml), and remember to shake the bottle well before pouring out the solution. Advanced users could increase the dosage to two daily servings.
I find that one serving works for me to give the boost and focus I need throughout the day, but not for losing weight.
Few genuine customer reviews are available online with a not-so-high average product rating.
Some websites displaying product recommendations offer money and rewards in return for a product review, making me question the honesty and trustworthiness of those mostly generalized praises.
Here are some excerpts of customer statements with more details:
“Decent supplement addition, not life-changing [...] this product has an awful taste [...] a decent addition to whatever your supplement stack may be to continue energy gain and weight loss. The effects aren’t there unless you’re already sticking to a caloric deficit in your diet.”
“It’s too soon to tell regarding results but I have noticed a boost of energy when I take it at least x2 a day. The flavor is manageable just a bit too sweet for me maybe but would love to try this is another flavor.”
“Decent caffeine lift without the stomach pain from coffee. Make sure you follow the serving size listed on the bottle, especially if you are sensitive to caffeine. Tastes okay.”
“Good L-carnitine, average dosage, normal price. The taste is pleasant, not very sweet.”
Fat Burner Alternatives
PhenQ is a 5-in-1 all-natural fat burner that aims to burn fat, stop fat production, suppress appetite, boost energy, and improve overall mood.
Unlike Liquid Burn with only three ingredients, PhenQ contains six ingredients as well as a licensed weight loss formula to approach weight loss in different ways.
It has lower doses of caffeine and L-carnitine compared to Liquid Burn, but it has added capsimax, nopal, and minerals for better appetite control, making it suitable for individuals who want to lose more excess weight, reduce cravings, and enhance overall mood.
LeanBean is one of the best all-natural fat burners for women that also acts as an appetite suppressant to maximize weight loss results.
It contains a whopping 3 g dose of glucomannan as well as fat-burning ingredients like green coffee bean extract and turmeric.
Unlike Liquid Burn that uses caffeine to boost metabolism, it doesn’t heavily depend on stimulants such as caffeine to enhance thermogenesis without the nasty side effects. It’s an ideal female-friendly fat burner and appetite suppressant that can be coupled with a healthy diet and regular exercise to get to the body of your dreams.
Instant Knockout is a powerful, vegan-friendly weight loss formula designed with bodybuilders and performance athletes in mind.
Similar to Liquid Burn, it contains caffeine and green tea extract to promote thermogenesis, but it has added L-theanine and cayenne to speed up fat burning.
It also has a good dose of glucomannan and vitamins to regulate appetite and support muscle growth, which you won’t find in Liquid Burn.
While it’s originally formulated for professional athletes, it also works wonders for active people who want to lose excess weight and achieve a toned body in no time.
Should You Buy RSP Liquid Burn?
After looking at online reviews and months of client testing, we find it a bit lacking in weight loss results.
While it comes in a liquid form for maximum absorption and provides clean energy that lasts for hours, it might not increase your calorie burn to see a significant weight reduction unless you get serious about your diet.
If you’re searching for a safe, effective all-in-one fat burner, appetite suppressant, energy booster, and mood enhancer, PhenQ may be exactly what you need.
PhenQ has been around for longer with tons of social proof, and it contains a superior science-backed thermogenic formula. The a-Lacy’s reset is something revolutionary that most people find effective in helping them lose weight.
What are your thoughts on Liquid Burn? Let us know!