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RSP Liquid Burn Review:
Ingredients, Side Effects & More

Tyler Sellers
Published by Tyler Sellers
Fact checked by Donald Christman, BHSc FACT CHECKED
Last updated: September 14, 2021

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 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?

Liquid Burn Package

Liquid Burn is advertised as an all-in-one fat-burning product containing natural flavors and a synergistic content combination.

It claims to support cellular health, enhance metabolism with its thermogenic L-carnitine matrix, burn fat, improve athletic performance and 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 and improves lean body composition (relying on three ingredients in ineffective doses).

Additionally, if you're a female, you can check out our list of the best fat burners for women.

Active Ingredients

raw ingredients

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 (1,500mg)

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. [1] [2]

Besides supporting weight loss, L-carnitine helps the brain, heart, and other disease prevention. [3]

Caffeine Anhydrous (150mg)

Research shows that this stimulant can increase energy, focus, metabolism, and exercise performance, reduce fatigue and appetite, and enhance weight loss by stimulating thermogenesis. [4] [5]

But pure, highly concentrated powder or liquid caffeine forms can be dangerous. [6] Plus, it becomes less effective as you get used to high doses over time so we recommend you to opt-out for caffeine-free pre-workout instead. [7]

Green Tea Extract (100mg)

Besides antioxidants, Green Tea Extract contains caffeine, which influences fat oxidation and stimulates thermogenesis to support weight management slightly. [8] [9]

It can also aid in preventing cell damage and protecting overall health.

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
  • Affordable
  • 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
  • May contain some common allergens

Side Effects

Liquid Burn Package

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

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 to Take It

It’s best to use one serving (one tablespoon or 15ml) once a day after shaking the bottle well. Advanced users could increase the dosage to two daily servings.

Customer Reviews

Liquid Burn Feedback

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.”

Should You Buy RSP Liquid Burn?

Yes, there is a far better fat burner alternative. Indeed.

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!



Our #1 Recommendation

  • Boosts energy for better gym performance
  • Suppresses appetite
  • Improves overall mood and brain function
  • Replenishes body's lost electrolytes
  • Get the BEST PRICE until the end of September
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3 thoughts on “RSP Liquid Burn Review:
Ingredients, Side Effects & More

  1. It’s a decent supplement but it’s did not do anything big. It’s a good compliment to whatever supplement stack you are doing to maintain energy and weight loss. Unless you already have a calorie deficit in your diet, the results are minimal. Results are still results though. Still kudos!

    1. Thanks for this additional feedback, Marc. I’m sure it will help others with their future choices.

  2. Good caffeine boost without the stomach ache associated with coffee. Make sure to stick to the serving size given on the bottle, especially if you are caffeine sensitive. It tastes alright. I received a fantastic deal and was pleased with the goods.

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