RSP Nutrition Quadralean Non-Stim Review (2024) Legit or BS?

Lisa Lorraine Taylor, BSc, CPT
Published by Lisa Lorraine Taylor, BSc, CPT | Staff Writer
Last updated: June 22, 2024
We personally test every product featured in our reviews and guides. By ordering products anonymously and getting a group of independent testers, we are able to get first-hand experience and provide data-driven recommendations. Learn more.

RSP Nutrition is kind of a household name in the fitness industry, and one of their main products is called Quadralean.

As part of their weight loss range of products, this fat burner seems to have some celebrity backing. And in our experience, that often means more money is spent on advertising than product development.

As a fitness trainer, I wanted to test the waters with Quadralean before I could decide whether to recommend to it readers or not.

So, we ordered a few bottles and worked with some of our clients from different walks of life, to see if it actually lives up to the hype.

Here's what I found.


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Who is it for?

Who is it for?

  • People who want a stimulant-free weight management solution
  • Those interested in metabolism and energy support without caffeine

Who is it not for?

  • Those preferring thermogenic fat burners

Final Verdict

QuadraLean is great for anyone avoiding stimulants while wanting to maintain lean muscle. It may not satisfy those looking for thermogenic effects.

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What Is Quadralean?

Quadralean Product Close Up shot

Quadralean is a stimulant-free fat burner scientifically formulated to help you better deal with stubborn body fat. It addresses the four key factors of weight loss: energy, fat stores, appetite, and metabolism.

With ingredients that increase metabolism, it may help with general weight loss and performance athletes in a cutting phase.

More on the ingredients shortly.

The manufacturer also claims that their fat burner would help with appetite suppression, which could make quite a difference in avoiding snacks and sticking with a healthy diet.

To summarize their claims, it should increase your energy expenditure and help you eat less food.

Suitable For Men & Women

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Quadralean Ingredients

To assess the fat-burning ingredients Quadralean has, we sat down with our dietitian to look at two main factors.

Firstly, is there any science behind the chosen formula? And secondly, is the dosage per serving strong enough to help with weight loss management?

Let’s see what we found.

1. Conjugated Linoleic Acid (CLA) (750 mg)

Supplement Facts of Quadralean

One study from the Journal of the International Society of Sports Nutrition was able to link conjugated linoleic acid to a positive impact on fat storage [1].

And we also noted that Quadralean seems to have one of the higher doses of CLA on the market and may actually be effective for weight loss.

2. Acetyl L Carnitine (500 mg)

I find this ingredient in most pre-workouts today, and for a good reason.

According to a study from Nutrients, L-carnitine supplementation may aid in post-workout recovery [2].

“Acetyl L carnitine also helps your muscle mitochondria burn fat, which can increase your endurance, give you an edge in the gym and help you recover faster.”

- Spencer Brooks, Nutrition Science Writer

3. Green Tea Extract (250 mg)

Green tea extract is possibly one of the most underrated thermogenic ingredients, but quite a few medical studies have confirmed this effect [3].

The one thing we would say about this is that the dosage might be a bit on the low side based on the research information from our dietitian.

4. Grains Of Paradise Extract (25 mg)

Grains of Paradise Extract close up image

This fancy-sounding ingredient is something we haven’t seen in many weight loss supplements.

Some studies have shown good effects of weight loss [4].

However, this was achieved at a higher dose than with the Quadralean content.

Note that Quadralean contains gelatin, so vegans should stay away. We do have a list of the best vegan fat burners, make sure to check that out.

Quadralean Pros and Cons

Woman giving thumbs up and down

First of all, let me mention that we were all happy with the amount of CLA contained in this fat burner. Compared to other supplements, it has considerably more, which seems to be backed up by folks who reviewed it.

The serving size of 3 capsules on an empty stomach twice daily is also reasonable as well. With no caffeine, that also means you could take it later in the day. Read here for more details on when you should take your fat burner supplement.

However, we did find that it had limited impacts on appetite, and there were quite a few reports of users having an upset stomach.

Basically, it’s not as great as it claims to be.

  • A good dose of CLA for thermogenic triggers
  • Stim free blend to avoid caffeine jitters and sleepless nights
  • Some ingredients don’t seem to be in a high enough dose
  • Some upset stomach reported in a few reviews
  • Reports of limited effects on appetite control

Suitable For Men & Women

Quadralean supplement product CTA


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Any Side Effects?

Man with severe headache

Quadralean may have side effects if you exceed six capsules a day. However, some people reported experiencing cramps and bloating even with the proper dosage.

In some reviews, these were related to taking it on an empty stomach, but others also said they had to give up on it as the cramps weren’t worth the heightened metabolism.

Going with natural fat burner ingredients may minimize these side effects

Here are some alternatives you can try:

Where Can You Buy It?

You can buy Quadralean from the official website, but I’ve also seen some good offers on Amazon. Just be careful when buying from the latter and check the serving size. One bottle should always contain 150 capsules.

With quite a few reports of counterfeit products on dodgy marketplaces, it’s always best to stick with trusted sites when you’re ordering fat burners.

User Reviews

During our research phase, we always go through Facebook groups and forums to see if other people were able to achieve their weight loss goals and drop some pounds. This is also a way we try to confirm our own results.

Here are some important ones to highlight.

As a bodybuilder, he was looking for help in a cutting phase, and Quadralean seems to have helped him also maintain lean muscle mass.

- Johnny from NY

Lisa was on a weight loss program and joined a spinning class. Her results were positive as well, but she did need to reduce the dosage to avoid cramps.

- Lisa from Chicago

Emily switched to a different fat burner after two weeks because the bloating seemed severe. Even taking it immediately before food didn't seem to solve the problem.

- Emily from Austin

While Anna did report some fat loss, she was missing the appetite suppression to extend her fasting periods. She also found it a bit hard on the stomach when taken without food.

- Anna from Fargo

Fat Burner Alternatives

We wanted to see if Quadralean could shred fat with the best of them, so we compared it to three popular fat-burning supplements. Here’s what we found.


As a fitness trainer, I’ve seen clients experiment with a multitude of weight loss pills. Naturally, I was intrigued when I heard the buzz surrounding PhenQ and incorporated it into our testing.

Our test group followed our recommended exercise regimen and diet plan, and they observed visible improvements in their body composition supported by a comparison of before and after measurements.

Its ability to suppress food cravings and snacking habits caught my attention. Upon consultation with our dietitian, we attributed this effect to PhenQ’s blend of caffeine and nopal.

PhenQ is not a stim-free fat burner like Quadralean, so users who are sensitive to or try to avoid stimulants should be mindful of that. However, 75 mg is a reasonably light dose as far as fat burners go and not enough to make you adjust your morning coffee intake.

PhenQ costs more than Quadralean, but its effectiveness and all-natural, effectively-dosed ingredients make it well worth the price tag.


PrimeShred is another fat-burning supplement that caught my attention because it promises to burn fat, boost metabolism and act as a nootropic, an exciting combination.

Our group of volunteers experienced solid results, though the 250 mg of caffeine, which Quadralean does not have and was a bit much for some in the group. Others welcomed the energy boost.

PrimeShred uses veggie capsules, making it suitable over Quadralean’s gelatin capsules for plant-based diets. The dosing is the same for both products of three capsules on an empty stomach.

PrimeShred is more expensive than Quadralean; however, ordering from the website will get you discounts for minimum purchases like free shipping and product and a money-back guarantee.

Evlution Nutrition Trans4orm

There are many positive things to say about Evlution Nutrition’s Trans4orm like it is made in a GMP-certified facility in the USA and contains ingredients that are purity verified by a third-party lab.

Like Quadralean, Trans4orm is a fat burner suitable for both men and women, so our test group included both, following our designed exercise and diet plan. Some users reported side effects, but this was by no means universal.

Trans4orm is not stim-free like Quadralean, containing 175 mg of caffeine, enough for a kick to energy and the thermogenic process.

Additionally, there was a level of discrepancy in effectiveness as some testers showed good improvement in body measurements while others had no change at all.

Like Quadralean, Trans4orm includes a gelatin capsule, which is unsuitable for vegans or vegetarians.

All-in-all, Trans4orm comes from a reputable company and could bring solid results for some users.


When Should You Take Quadralean?

You should take Quadralean about 30 minutes before a main meal so the fat loss ingredients can be absorbed quicker, boosting your metabolism. But if you find that it causes cramps, it might be better to take them immediately before eating.

Is RSP Quadralean Thermogenic?

Yes, RSP Quadralean is thermogenic, with green tea and CLA being its main thermogenic ingredients. According to many dietitians, they help burn stubborn fat reserves effectively.

Does Quadralean Have Caffeine?

No, Quadralean doesn’t have caffeine. If you are sensitive to stimulants or tend to get a bit jittery after coffee, you may want to avoid this ingredient.

Our Verdict on RSP Nutrition Quadralean

Our conclusion is that we wouldn’t recommend this product to clients, mainly because quite a few users reported stomach cramps after taking it. While they are temporary, it’s just not a health issue you have to deal with.

PhenQ would likely be much safer and more effective. PhenQ is often used by performance and professional athletes and it provides them with an efficient product that burns fat and builds lean muscle effectively.

The ingredients are scientifically backed and side effects are quite rare so I recommend it to anyone, especially those with sensitive stomachs.


We Recommend This Instead


PhenQ CTA supplement product

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Ingredient quality
  • 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 July
  • Get the BEST PRICE until the end of July
  • Can be only purchased through the company website
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About The Author

Lisa Lorraine Taylor, BSc, CPT
Staff Writer
Lisa Lorraine Taylor, BSc, CPT holds a BSc degree in Holistic Nutrition from Clayton College of Natural Health and is the owner of Taylor Made Fitness. Her philosophy centers on cutting through the hype and misinformation surrounding dietary supplements, focusing instead on practical, science-backed strategies for health and weight loss.
Learn more about our editorial policy
Dr. Harshi Dhingra, MBBS, MD is a published peer-reviewed author and renowned physician from India with over a decade of experience. With her MBBS from Bharati Vidyapeeth and an MD from Rajiv Gandhi University, she actively ensures the accuracy of online dietary supplement and medical information by reviewing and fact-checking health publications.
Learn more about our editorial policy
Dr. Kristy June Dayanan, BS, MD is an author with a BS degree from University of the Philippines and an MD from University of Perpetual Help System. Her ability to simplify medical science complexities and dietary supplement jargon for the average reader makes her a valued medical fact checker and reviewer.
Learn more about our editorial policy

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  1. This is one of the most informative reviews I’ve ever read. Thanks!

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