Core Nutritionals

BURN , 150 Capsules

Fat Loss Support!*
Designed To Target Metabolic Pathways For Incinerating Fat!*
8.9  out of 10  (10 Reviews)
Save 15%
Order and automatically receive 15% Off Burn, 150 Capsules! Price shown reflects your discount.

Product Overview

Why does it have to be so difficult? You sit there, a bottle of pills in one hand, a tub of powder in the other, staring blankly at a seemingly endless wall of potions, tinctures, and tonics all with one purpose in mind – to improve the way your body looks, and how you feel about it.

But how do you choose? Which is the best, or the worst? For that matter, how do you even decipher what’s in the bottle in front of you, when the amount of every ingredient is masked behind a thousand promises and the ever-present, “proprietary blend.”

Confused about which “miracle breakthrough,” or “huge advance in science” to choose, you select the one that seems the most popular and go home. After three or four weeks, the only thing that’s slimmer is your wallet, and you decide that all supplements are worthless.

But what if there was a better, more effective way? What if, instead of promising “breakthroughs,” “advances,” and “revolutions,” a company simply promised clinically-effective ingredients, at clinically-effective servings? What if, instead of shouting about “secrets of the trade,” a company admitted there really wasn’t any – that the only true secret is who’s willing to spend the time, effort, and money, to deliver an amazing product. What if this company – gasp! – told you exactly what was in the product? Wouldn’t that be the better way?

Core Nutritionals’ Core BURN Ultra powder is that better way. There are no gimmicks here, no tricks and trade secrets. Just the very best, most verified-effective ingredients at serving sizes known to exert powerful effects on the human body. With Core BURN Ultra, we have taken many of the same ultra-potent ingredients found in Core BURN, mixed in a few amazing new friends, and put the whole thing in a delicious, convenient, and rapidly-dissolving powder.

In the end, it’s your choice: flashy magazine ads, or an unrivaled and extreme thermo that plain, flat-out works as promised. If we had to choose between a slim wallet or a slim waist, we’d choose the latter – because we’d choose Core BURN Ultra.

L-carnitine is a derivative of the amino acid lysine and, as certain conditions outpace the body’s ability to produce it, l-carnitine is considered a conditionally essential amino acid. While endogenous biosynthesis of l-carnitine from the amino acids lysine and methionine is sufficient for essential processes – along with dietary sources of carnitine from protein-rich red meat, for example – dietary supplementation of carnitine may pose benefits in certain physiological conditions. 

Unfortunately, due to excess metabolism of l-carnitine by microorganisms in the small intestine, exogenous supplementation with oral l-carnitine has proved ineffective. ALCAR, an acetylated version of l-carnitine, has considerably higher oral bioavailability, due likely to only partial hydrolytic metabolism. Once in the bloodstream, ALCAR plays a fundamental role in the production of energy, acting as the catalyst for the beta-oxidation of long chain fatty acids by the mitochondria; regulating the CoA to Acyl-CoA ratio (necessary for the production of ATP); and the metabolism of carbohydrates. ALCAR also is an excitatory agent for neurons, increases neuronal transmission, and increases the production of neurotransmitters and neurohormones such as dopamine and serotonin.

Garcinia cambogia fruit extract (50% hydroxycitric acid):
Garcinia cambogia, more commonly known under a variety of names, including the tamarind, is a small tropical fruit endemic to Indonesia. This plant has come under increased media attention over the past few years, due largely to the purported effects of its principal constituent, hyrdoxycitric acid, or HCA.

HCA itself is a derivative of citric acid, and competitively inhibits the enzyme adenosine triphosphatase-citrate-lyase. This enzyme is an extra-mitochondrial enzyme (meaning it sits outside the mitochondria) chiefly responsible for a process known as de novo lipogenesis – or the production of fatty acids from glucose.

Green coffee extract (50% chlorogenic acid):
Chlorogenic acids are phenolic compounds created during the metabolism of various isoquinic acids found in the leaves of both coffee and tea. In addition to the well-established sympathomimetic effects of coffee and tea’s constituents, recent research has demonstrated a range of other potential benefits for compounds such as chlorogenic acids.

Recent literature suggests that the consumption of both green coffee, as well as standardized extracts of CGAs, relax the vasculature and improve vasoreactivity, impose an inhibitory effect on lipid accumulation and body weight in both mice and humans, and modulate glucose metabolism via the glucose-6-phosphate pathway.

Trials in both humans and mice using 1% extracts of green coffee bean revealed significant bodyweight reductions over periods of two and eight weeks. Researchers hypothesized that the bodyweight reductions associated with oral CGA administration was associated with the product’s numerous mechanisms of action, rather than a single, isolated cause.

Caffeine (1,3,7-trimethylxanthine) and Theobromine (3,7-dimethyl-1H-purine-2,6-dione):
Caffeine is the most widely consumed, and perhaps one of the most reviewed, psychoactive compounds. Its physiological effects in a range of areas have been well-documented, including exercise performance, information processing, alertness and mood enhancement, attention, and awareness, along with its anti-lipogenic and lipolytic abilities. Caffeine is also the most well-known in the methylxanthine compound class, the constituents of which inter-metabolize into one another in the human body and largely share similar effects.

Various clinical trials have demonstrated that xanthines – including caffeine and theobromine – exert potent lipolytic (the breakdown of fat tissue into fatty acids) and oxidative (the actual ‘burning’ of fat) actions as sympathomimetic amines. In less scientifically-complex parlance, this means caffeine is forcing your body to preferentially use fat tissue as a fuel source for the oxidative provision of ATP (your body’s energy currency).

Evidence for caffeine’s capacity as a lipolytic is widely available. In a clinical study featuring four separate trials in both normal and obese subjects, for example, caffeine was found to significantly increase fatty acid metabolism (as measured by serum fatty acid concentration), resting metabolic rate, and total fat oxidation – suggesting the preferential substrate selection spoken about above occurs in both normal and obese individuals. Other trials have demonstrated the effects of methylxanthines on total fat mass (reduction), lean body mass (increases), stamina and endurance, as well as cardiovascular capacity.

Additionally, as selective cAMP potentiators, through the beta-adrenergic pathway, caffeine and theobromine have been hypothesized to exert a synergistic effect on lipolysis when combined with forskolin.

Coleus forskohlii root extract (10% forskolin):
Coleus forskohlii is a small perennial endemic to various tropical regions in the world, including South America, sub-Saharan Africa, and India. While the West has recently taken interest in the plant due to the pharmacological properties of its primary bioactive, forskolin, Coleus forskholii preparations and tinctures have been used in both South American and African traditional folk medicinal systems, as well as extensively within Ayurveda.

Due to the ever-increasing interest in the plant’s verifiable pharmacological and physiological effects, however, Coleus forksholii and its extracted constituents have been the subject of numerous animal and human clinical trials in the past decade. These trials have demonstrated the plant to have various effects and applications, including as a lipolytic and anti-lipogenic, and as a powerful antioxidant.

A recent double-blind, randomized, and placebo-controlled human clinical trial featuring obese men found that the daily implementation of Coleus forskholii, for twelve weeks, led to significantly better weight loss outcomes as compared to controls. Overweight men in the forskolin group experienced not only improved body composition (as measured by both body fat percentage and total fat mass), but also statistically significant increases in lean body mass.

Coleus forskholii – and more specifically, forskolin – achieves this effect by rapidly, potently, and dose-dependently increasing an important metabolic enzyme known as adenylate cyclase. Adenylate cyclase is an enzyme responsible for catalyzing the formation of cyclic adenosine monophosphate (cAMP) from adenosine triphosphate (ATP). This increase in cAMP formation eventually leads to the activation of an enzyme, protein kinase A, which in turn will phosphorylate and hence activate the enzyme, Hormone Sensitive Lipase (HSL) – the rate-limiting enzyme necessary for stored triglycerides within adipocytes to be released as free fatty acids and utilized for energy.

In more basic terms, this means that forskolin quite literally frees up more fatty acids to be used as fuel for exercise – more or less the perfect scenario in a product such as Core BURN Ultra!

Bacopa monnieri (50% bacosides):
Bacopa monnieri, also known as the water hyssop commonly, or as Brahmi in Ayurvedic texts, is a small creeping herb endemic to sub-tropical India. The herb has been used in traditional Indian medicine for well over one thousand years, with its first recorded usage coming in the 6th century A.D. In this traditional context, BM has been used for a wide-range of purposes, including as a treatment of asthma and epilepsy.

More recently, BM has been the subject of numerous cognition and memory trials, as the plant has a well-established nootropic effect. Likely through modulation of the serotonin reuptake system, clinical trials in healthy humans have demonstrated that BM possesses a significant effect on the retention of newly-learned information. In several trials utilizing a 300mg daily serving, BM was also shown to decrease the recall delay of newly learned information and reduce short term forgetfulness – suggesting that the herb’s effect on the serotonic and cholinergic systems are increasing the encoding (the literal storing) of memory information.

Beyond cognition and memory encoding, BM has also been demonstrated to function as a potent adaptogen and relaxant – which in the Core BURN Ultra formula may help to smooth the effect curve of the product’s stimulants, reducing jitteriness or, “crash.”

Advantra-Z® Bitter Orange Extract (Citrus aurantium) (fruit) (50% synephrine):
Synephrine is a naturally-occurring alkaloid with adrenergic agonist activity, structurally related to epinephrine, norepinephrine, ephedrine, and other compounds with a phenethylamine base structure. Despite its chemical similarity to these compounds, synephrine in its various isomers exerts unique effects on adrenergic receptors, in particular, and the human body, in general.


Synephrine exists in three isomer forms: para-, meta- and ortho-synephrine. The molecular changes between the three isoforms are minute, but even this small change results in significant alterations to each isomer’s physiological and pharmacokinetic profile. Two of synephrine’s isomers, both p- and m-synephrine, have been shown to naturally occur in mammals (in low concentrations). As a sympathomimetic, synephrine has been the subject of numerous trials, assessing its effects on weight management, thermogenesis, metabolic rate, and caloric expenditure. In a double-blind, randomized, and placebo-controlled trial involving 10 healthy individuals, the p-synephrine isomer was administered at a 50mg serving, both alone, and in combination with hesperidin and naringin. The authors measured resting metabolic rate (RMR), blood pressure, and heart rate, along with subjective feelings of mood and energy, at baseline, and at 45-mintues and 75-minutes after ingestion. The authors reported a significant increase in RMR in each of the supplement groups, relative to placebo.


In addition to studies on synephrine in its various isomers, Advantra-Z®, the specific form of synephrine utilized in Core BURN Ultra, has itself and in combination with other ingredients, been the subject of various clinical trials in humans. In a randomized, double-blind, placebo-controlled trial featuring 70 obese adults, a formulation containing Advantra-Z® was found to significantly reduce fat mass, body weight, and hip and waist girth as compared to controls, while leading to an increase in lean mass. As the authors comment, these results are in-line with a recent systematic review of human clinical studies involving Citrus aurantium, that revealed the ingredient to reliably increase resting metabolic rate up to 7.2%, increase energy expenditure of up to 13.4%, and weight loss of over 2.9 kg, with no serious adverse events in any of the trials.


In addition, the combination of caffeine and synephrine appears to potentiate each ingredient’s effects – with rates of fatty acid liberation, heart rate, metabolic rate, and fatty acid oxidation increased in clinical trials featuring the combination. In the same systematic review mentioned above, the authors note that the combination of synephrine and caffeine led to a small but significant reduction in fat mass of 3lbs, and a reduction in bodyfat of 2.9%.


Combined with not only caffeine, but the other ingredients in Core BURN, Advantra-Z® appears to be a potent weapon in the arsenal for body composition and weight management.

PURENERGY (Caffeine Pterostilbene Complex)
PURENERGY is a highly interesting, novel new dietary ingredient created by combining caffeine (at a 43% proportion) with pTeroPure, a 99% pure all-trans pterostilbene (at 53% proportion).

Pterostilbene is, in turn, itself a highly interesting compound, and the subject of considerable excitement and clinical research within the medical community. Found in small concentrations in blueberries and grapes, pterostilbene is a dimethylated version of the well-known compound resveratrol, and as a consequence, appears to share many of its beneficial physiological effects. Pterostilbene, in addition, has been hypothesized to exert unique effects in the human body through both genomic and enzymatic pathways, including functioning as a potent antioxidant, as well as playing a role in the regulation of glycolytic/gluconeogenic enzymes such as hexokinase, glucose-6-phosphatase, and fructose-1,6-bisphosphatase.

In combination as PURENERGY, caffeine and pterostilbene have been the subject of a single, but promising, human trial. The results from this trial demonstrated:

  • PURENERGY delivers almost 30% more caffeine into the blood than ordinary caffeine.
  • The rate of caffeine absorption is significantly slower with PURENERGY, by about 30% as compared to ordinary caffeine
  • The half-life of caffeine from PURENERGY is extended significantly by about 25% over that of ordinary caffeine.
  • At 4 hours, there was 45% more caffeine from PURENERGY compared to ordinary caffeine alone
  • At 6 hours, there was 51% more caffeine from PURENERGY compared to ordinary caffeine alone.
  • At 6 hours, subjects taking PURENERGY showed significantly less fatigue and greater concentration compared to baseline. Ordinary caffeine did not.
  • At 6 hours, subjects taking PURENERGY showed improved energy, alertness and focus compared to baseline. Ordinary caffeine did not.

Coupled with a lack of adverse events seen in the trial, PURENERGY may represent a significant leap forward in the dietary supplement field.

Ratings & Reviews

Overall Rating
10 Ratings
By clicking the button above, you agree to entering the Bodybuilding.com Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
Aug 29, 2017

Fat burners only work if you do. If you have a good diet and workout hard in the gym then the BURN profile will help you on your fat loss journey. Great overall profile.

Apr 10, 2015

I was lucky enough to receive a 150 capsule bottle to review and have to say this was one of the most effective fat burners that I have used. The combination of the Coleus forskohlii root and Raspberry Ketone make a powerful fat burning combination. I took 2 capsules with 8 oz of water before breakfast another 2 capsules with 8 oz of water before lunch and another 2 capsules with 8oz of water 30 minutes before the day's workout and the Core Burn gave me energy to get thru my workout with ease and absolutely contributed to my excess fat loss. I lost approximately 6lbs of body fat while using this product and recommend it to anyone looking to shed some excess body fat.

Dec 27, 2014

I received a few samples of this thermogenic back when it first came out and I honestly don't use fat burners to lose weight but if I try a thermo and I like the energy and focus I get from it I'll pick it up and incorporate in my pre-workout rotation and use it as a stimulant for my early a.m. workouts. At 3 caps which is one serving it KICKS IN FAST and what I liked was that the energy was long lasting well after my workout. I stack this with a pump supplement with out caffeine and some extra citrulline malate and I'm good to go for a long training session. I didn't experience any bad effects such as energy crash or upset stomach but I do recommend if your stimulant sensitive start with 1 to 2 caps cause 3 caps hits fast and hard.

Feb 24, 2014

Unlike other fat burners, I didn't find myself to flush with this product but I did have the occasional burps that tasted of raspberry. I feel as though the caffeine gave me an energy boost and kept me going throughout the day.

Feb 22, 2014

Was lucky enough for receive a few samples of Core Burn. Great effective fat burner. I Got solid energy, focus, and elevated body temperature.

Jan 21, 2014

This has been a great thermo for me. I will continue to use! Has been great for me to maintain mental clarity while dieting.

Nov 04, 2013

This definitely seemed to have more of a punch to it than other thermogenics I've tried, but I didn't see any weight loss. But then again, I only had sample packs that I took for four days, I believe. Maybe it'll work better for you. All I got was sight jitters after about an hour and a half.

Jul 26, 2013

I added this into my supplement regimen prior to my second competition this year and was able to actually see the effects as I got leaner than I had ever previously been. Great fat burner and a particularly effective aid to shed the last stubborn bits of body fat. Extremely strong though so I would advise easing into it as you assess your tolerance...

Jul 25, 2013

I have been using this fat burner for the final 7 weeks of my contest prep. This is a seriously strong fat burner. The ingredients are in effective dosages and using only effective ingredients. There are so many gimmick fat burners on the market, it is nice to see one that actually has some research behind it.

Jul 12, 2013
No written review.
1 Size
150 Capsules
Choose a Size
{{group.violatorText}} {{group.name}}
Choose a Flavor
Flavor Rating: {{sku.flavorRating | flavorRating}}
Save 15%
Was:  $60.99
Was:  {{vm.group.strikePriceDisplay}}
Price: $51.84  ($1.04 / Serving)
Flavor Rating:
Designed To Target Metabolic Pathways For Incinerating Fat!*

What's in Core Nutritionals BURN

150 Capsules
Serving Size: 3 Capsules
Servings Per Container: 50
Amount per 3 Capsules % DV
Acetyl-L-Carnitine 500 mg *
Green Tea Extract (Camillia sinensis) (leaf) (50% EGCG) 400 mg *
Green Coffee Extract (Coffee arabica) (bean) (50% chlorogenic acid) 400 mg *
Olive Extract (Olea europaea) (leaf) (20% oleuropein) 250 mg *
Caffeine (1,3,7-trimethylxanthine) 250 mg *
Bacopa monniera Extract (whole plant) (50% bacosides) 200 mg *
ForsLean® (Coleus forskohlii) (root) (20% forskolin) 100 mg *
Theobromine (3,7-dimethyl-1H-purine-2,6-dione) 100 mg *
Yohimbe Extract (Pausinystalia yohimbe) (bark) (8% yohimbine alkaloid) 75 mg *
Advantra-Z® Bitter Orange Extract (Citrus aurantium) (fruit) (50% synephrine) 50 mg *
* Daily Value Not Established
Other Ingredients:
Cellulose, Magnesium Stearate, Silicon Dioxide.

Directions For BURN: To assess tolerance, start by taking 2 capsules with food in the morning. An additional 2 capsules can be taken with food 5-6 hours later. Once tolerance is assessed, serving can be increased to 3 capsules in the morning and 3 capsules 5-6 hours later. Do not exceed 6 capsules in a 24 hours period. Do not use longer than 8 continuous weeks without a 4 week break. Do not take with any other products or foods containing caffeine or other stimulants.

Warnings: This product is only intended for use in healthy adults 18 years of age or older. Pregnant or nursing women should not use this product. Consult your healthcare provider before using this product, especially if you are taking any prescription, over the counter medication, dietary supplement product, or if you have any pre-existing medical condition including but not limited to: high or low blood pressure, cardiac arrhythmia, stroke, heart, liver, kidney or thyroid disease, seizure disorder, psychiatric disease, diabetes, difficulty urinating due to prostate enlargement or if you are taking a MAOI (Monoamine Oxidase Inhibitor) or any other medication. Immediately discontinue use and consult your health care professional if you experience adverse reaction to this product. Do not exceed recommended serving. Each serving of this product contains 250 mg of caffeine. Could cause sleeplessness if taken within 4 hours of bedtime. May not be appropriate for caffeine-sensitive individuals. Do not use in combination with caffeine or any stimulants, including but not limited to, coffee, tea, soda, and other dietary supplements or medications. Do not use under extreme conditions of heat, sleep deprivation, extreme cardiovascular exertion or dehydration. Do not combine with alcohol. Do not use if safety seal is broken or missing. Keep out of reach of children.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Learn more about Acetyl L-Carnitine.
Check out other Weight Management Products.