Core Nutritionals BURN: Thermogenic Fat Burning Powder with Punch

More stimulants doesn't mean more fat loss. Core Nutritionals BURN proves it with 200mg caffeine plus patented ingredients that target cortisol, white-to-brown fat conversion, and appetite in a single 4.1g scoop.

Fat loss supplements often collapse to a single premise: "stimulants drive thermogenesis, so more stimulants means more fat loss". Not so fast, and not always so smart! The Core Nutritionals BURN fat burning drink mix does have 200mg caffeine per serving, but also uses trademarked and patented ingredients to address every major metabolic pathway involved in fat creation and storage. It covers energy, cortisol regulation, white adipose tissue (WAT) to brown adipose tissue (BAT) conversion, and appetite control in a single 4.1g scoop.

BURN is part of Core's PR Series, developed in collaboration with natural bodybuilder Paul Revelia. Doug Miller founded Core Nutritionals in 2005 to build the kind of food-based meal replacement that serious athletes had been missing. His starting point was Core MRP, and the science-first philosophy behind that product runs through every formula Core produces today.

On Episode #219 of the PricePlow Podcast, Doug discussed Core's approach to formula development and what separates thoughtful products from the noise. BURN reflects those values. The formula received a meaningful update in 2023 that added Laminaria japonica extract for its fucoxanthin content, replacing yerba mate and deepening the product's WAT-burning capabilities. The total caffeine of 200mg per serving is split between fast-acting anhydrous and extended-release zümXR for a smoother energy curve.

Check PricePlow for the latest prices and news on Core Nutritionals, then let's get into the science:

Core BURN Ingredients

In a single 1-scoop (4.1g) serving, you get the following:

• N-Acetyl L-Carnitine HCl – 500mg

  N-Acetyl L-Carnitine (ALCAR) is the acetylated form of L-carnitine, and its role in fat metabolism starts inside your cells. Through the carnitine shuttle, long-chain fatty acids cross the mitochondrial membrane, feeding beta-oxidation and ATP production. ALCAR also buffers the acetyl-CoA/CoA ratio, helping preserve metabolic flexibility during hard training.^[1]

  Unlike standard L-carnitine, ALCAR crosses the blood-brain barrier (BBB), where its acetyl group can be incorporated into acetylcholine production, supporting the neurotransmitter system tied to attention and working memory.^[2] A double-blind trial in 96 subjects with chronic fatigue found that ALCAR supplementation reduced physical and mental fatigue scores and improved cognitive function versus placebo.^[3] A separate meta-analysis found these cognitive benefits increased with longer supplementation duration.^[4]

  At 500mg, this dose is below the 1.5–3g range used in most cognitive and fatigue studies, so effects here aren't full-blast. Still, ALCAR's cholinergic support pairs well with the bacopa and ashwagandha in BURN, helping keep your head clear when a caloric deficit starts to cloud your thinking.

• KSM-66® Full-Spectrum Ashwagandha Extract (Withania somnifera) (Root) (5% Withanolides) – 300mg

  KSM-66® is a full-spectrum ashwagandha root extract standardized to 5% withanolides via a water-based process, and it's the most thoroughly studied branded ashwagandha extract available. In a fat burner, its primary role is cortisol management: chronic stress elevates cortisol, which promotes abdominal fat storage, suppresses lipolysis, and undermines appetite control. KSM-66 helps support a healthy stress response through the hypothalamic-pituitary-adrenal (HPA) axis.

  

  A double-blind, placebo-controlled KSM-66 trial at 300mg twice daily found serum cortisol fell 27.9% from baseline in the treatment group versus 7.9% in placebo after 60 days (p=0.002).^[5] A separate eight-week KSM-66 resistance-training study saw body fat drop 3.5% in the ashwagandha group versus 1.5% in placebo, alongside significant testosterone increases (p=0.03 and p=0.004, respectively).^[6] At the cellular level, withanolides appear to inhibit preadipocyte-to-adipocyte differentiation, limiting new fat cell formation.^[7] KSM-66 also supports healthy sleep quality, and given the established link between sleep disruption and appetite dysregulation, this secondary benefit aligns well with the formula's fat-loss focus.^[8]

• Garcinia cambogia Extract (Fruit Rind) (60% Hydroxycitric Acid) – 250mg

  Garcinia cambogia extract is standardized to 60% hydroxycitric acid (HCA), a step above the 50% found in most Garcinia products, delivering 150mg of active HCA per serving.^[9] HCA is a competitive inhibitor of ATP citrate lyase (ACL), the extramitochondrial enzyme that converts citrate to acetyl-CoA, the first building block of de novo lipogenesis. So blocking ACL may limit fat biosynthesis when dietary carbohydrates run high.^[9] HCA also increases serotonin availability in brain cortex tissue, potentially supporting appetite regulation through a central satiety pathway,^[10] and a human trial found it roughly doubled post-exercise glycogen synthesis rate while improving post-meal insulin sensitivity.^[11]

  A meta-analysis of nine RCTs found HCA produced a small but statistically significant reduction in body weight over placebo (-0.88 kg).^[12] Stronger trials used 1,500 to 2,800mg HCA daily.^[13] At 150mg HCA per scoop, effects here will be slighter. That said, the serotonin pathway complements SaffSerene's leptin-based appetite support, giving Core BURN two distinct mechanisms to help manage hunger during a cut.

• Green Coffee Bean Extract (Coffea arabica) (Bean) (50% Chlorogenic Acid) – 250mg

  Green coffee bean extract (GCBE) delivers chlorogenic acid (CGA), the polyphenol that roasting largely destroys. Unroasted Coffea arabica beans retain 6-12% total CGAs by weight, among the highest concentrations in any plant source.^[14] At 50% standardization, this scoop provides 125mg CGA.

  

  CGA targets metabolic levers that caffeine and theobromine don't: AMPK activation promotes fatty acid oxidation via carnitine palmitoyltransferase-1 (CPT-1), glucose-6-phosphatase (G-6-Pase) inhibition reduces hepatic glucose output, and SGLT-1 suppression slows intestinal glucose absorption after meals.^[14][15]

  A meta-analysis of 15 RCTs (897 participants) found GCE supplementation significantly reduced body weight (WMD: -1.23 kg), BMI (-0.48 kg/m²), and waist circumference (-1.00 cm) versus placebo.^[16] A 12-week double-blind RCT in overweight adults taking 500mg CGA daily found significant fat mass reductions confirmed by DEXA scan, with no adverse effects reported.^[15]

  At 125mg CGA per serving, BURN's dose sits below the 500mg/day threshold used in most positive trials, and effects from it alone here will be a bit slighter. That said, CGA covers metabolic ground the stimulants don't: its AMPK-driven fatty acid oxidation pathway directly complements the CPT-1 connection from the ALCAR section above.

• Cocoa Seed Extract (Theobroma cacao) (Seed) (20% Theobromine) – 200mg

  Cocoa seed extract is standardized here to 20% theobromine, delivering 40mg of this methylxanthine alkaloid per scoop alongside the same polyphenols that make dark chocolate a perennial topic in cardiovascular research. Theobromine shares caffeine's two primary mechanisms: adenosine receptor blockade and phosphodiesterase (PDE) inhibition, both of which elevate cyclic AMP (cAMP). But unlike caffeine, it works mostly at the peripheral level rather than directly in the CNS.^[17] Elevated cAMP helps cells ramp up energy expenditure, and in preclinical work, this pathway promotes PGC-1α upregulation, driving white adipose tissue conversion into thermogenic brown fat.^[18]

  That synergy with caffeine is the real story in Core Burn. Human research showed the caffeine-theobromine combination preserved alertness and mood benefits while neutralizing caffeine's blood pressure-raising effect -- a meaningful advantage given Core Burn's 200mg caffeine load.^[19] Theobromine's longer plasma half-life also sustains that peripheral effect beyond caffeine's peak window. A 2023 systematic review found theobromine may support healthy lipid profiles and vascular function, with two human RCTs reporting favorable augmentation index changes.^[20]

• Caffeine Anhydrous – 150mg (of 200mg Total)

  

  CORE Nutritionals Pump BLACK uses the Full Yield nitrate system to stack free-form ingredients AND their nitrate forms. 10g citrulline, 3.2g beta-alanine, 2.5g betaine, plus 1g total nitrates. Three distinct NO pathways, zero caffeine, zero compromises.

  Caffeine anhydrous is the fast-acting majority of Core BURN's dual-caffeine system, providing rapid-onset energy while zümXR handles the sustained tail. Beyond fighting fatigue, it has a direct case for fat burning: in lean human volunteers, repeated 100mg doses over a 12-hour period raised daily energy expenditure by 8–11%, netting roughly 150 kcal of additional caloric burn per day.^[21] A 2023 meta-analysis of 94 studies confirmed caffeine reliably increases fat metabolism at rest and during exercise, with free fatty acid and glycerol mobilization showing the strongest signal (ES = 0.55).^[22] An RCT meta-analysis further found that each doubling of caffeine intake corresponded to roughly a 28% increase in fat mass reduction.^[23]

  The mechanism runs through adenosine receptor antagonism, blocking the adenosine buildup that signals fatigue during extended wakefulness, and amplifying the cAMP pathway covered in the theobromine section above.^[24] Physical performance benefits are evident at approximately 200mg for a typical adult, meaning harder workouts and more calories burned in every session.^[25][26] One timing note: research found that caffeine consumed six hours before bed measurably disrupts sleep,^[27] so morning or early-afternoon dosing is advisable.

• zümXR® Extended-Release Caffeine – 70mg (Provides 50mg Caffeine)

  zümXR® is PLT Health's targeted-release caffeine technology, and its role in Core BURN is to extend the energy curve after the anhydrous caffeine peaks. Its ethylcellulose semi-permeable membrane coating changes caffeine's dissolution rather than its metabolism, releasing the payload gradually and independently of GI pH. A crossover pharmacokinetic study found that while immediate-release caffeine delivers its full dose within an hour, zümXR-ER had released only 26% at the one-hour mark and 79% at six hours.^[28] Peak serum concentration ran roughly 50% lower than standard caffeine, and the active duration was 300% longer, a profile that reduces jitter risk from front-loading and prevents the energy crash that follows a sharp caffeine spike. The coating materials carry FDA GRAS status.

• Bacopa monnieri Extract (Whole Plant) (50% Bacosides) – 100mg

  Bacopa monnieri (Brahmi) earns its place as a cognitive adaptogen through bacosides A and B, the triterpenoid saponins responsible for its neurological and stress-modulating effects.^[29]

  

  Doug Miller, CEO of Core Nutritionals, rejoins the PricePlow Podcast for Episode #219 to cover the full Crush It Holdings portfolio update: selling his Arms Race Nutrition stake, killing the Myoblox revival, two years of Unmatched Supps with Kris Gethin, the launch of Nova Prime Labs research-use peptides, and another brutal round of protein price increases.

  Research identifies several mechanisms. Bacosides support acetylcholine tone by inhibiting acetylcholinesterase (AChE) and activating choline acetyltransferase (ChAT),^[29] while also upregulating antioxidant enzymes (superoxide dismutase, catalase, glutathione peroxidase) throughout the brain.^[30] Bacopa also attenuates cortisol under stress: an acute double-blind crossover study found 640mg significantly reduced salivary cortisol at both one and two hours post-dose versus placebo (p=.018).^[31]

  For memory, chronic use matters most. A systematic review found bacopa improved 9 of 17 free recall tasks, with the clearest effect being reduced rate of forgetting of newly acquired information rather than faster learning.^[32] A nine-RCT meta-analysis of 437 subjects confirmed improved attention speed and reduced choice reaction time at 300mg/day.^[33]

  At 100mg, this dose sits well below the 300mg clinical threshold, so large standalone cognitive effects aren't expected. The cholinergic activity complements ALCAR's acetyl group contribution to acetylcholine synthesis, and the adaptogenic support layers onto KSM-66's HPA axis work, giving BURN a second cortisol management lane during a caloric deficit.

• Laminaria japonica Extract (Whole Plant) (10% Fucoxanthin) – 50mg

  Fucoxanthin is a brown carotenoid from edible seaweed. After ingestion, it converts to fucoxanthinol, its active metabolite, and absorbs alongside dietary fats.^[34]

  Its thermogenic action is CNS-independent. Fucoxanthin upregulates UCP-1 expression directly in white adipose tissue, driving calorie expenditure that mimics BAT activity, while β3-adrenergic receptor upregulation promotes lipolysis and heat generation.^[35] It also activates AMPK and enhances carnitine palmitoyltransferase-1 (CPT-1), mirroring ALCAR's fatty acid transport role and reinforcing beta-oxidation through a second lane.^[36]

  Human trials show meaningful benefits at doses below Core BURN's 5mg. A 16-week placebo-controlled study in 151 obese women using 2.4mg/day of fucoxanthin found significant reductions in body weight, body fat, liver fat, and triglycerides, while also raising resting energy expenditure.^[37] A 4-week trial in mildly obese adults using 1 to 3mg/day showed significant decreases in body weight, BMI, and both visceral and subcutaneous fat, with no adverse effects reported.^[38]

  

  At 5mg per scoop, Core BURN exceeds both clinical doses, with a clean safety profile and no stimulant load.

• Saffron Extract (Crocus sativus L.) (Stigma) (SaffSerene®) – 15mg

  SaffSerene® is a GRAS-certified saffron stigma extract standardized to 2% safranal, with crocin and picrocrocin rounding out its active profile. Per Core's product copy, it's one of the only dietary ingredients the FDA permits to make a hunger reduction claim, which is genuinely rare in the fat burner category.

  The likely mechanism runs through serotonin. Saffron's bioactive compounds appear to inhibit serotonin reuptake, elevating mood and reducing the stress-driven urge to snack (the kind that typically derails caloric deficits).^[39] In preclinical research, crocetin (the primary absorbed metabolite of dietary crocins) also normalized leptin and adiponectin expression in adipose tissue, pointing to a secondary hormonal appetite pathway.^[40]

  Clinical support comes from an 8-week, double-blind, placebo-controlled trial in 60 mildly overweight women: standardized saffron extract significantly reduced snacking frequency (p<0.05) and body weight versus placebo (p<0.01), with no caloric restriction imposed.^[39]

  At 15mg, this dose falls below the ~30mg equivalents used in most positive trials, so effects will be modest on their own. The serotonin pathway here complements KSM-66's HPA axis cortisol work and Bacopa's adaptogenic support, giving BURN three distinct mechanisms targeting stress-related caloric intake.

Core BURN Flavors Available

Core BURN is available in multiple flavors, including four added with the 2023 update: Apple Guava, Australian Gummy Snakes, Sour Candy, and Watermelon Grape. Check below for current availability:

Core BURN is part of Core's PR Series, developed in collaboration with natural bodybuilder Paul Revelia.

How to Use Core BURN

• Timing: Mix one scoop with 8 to 12 oz of water first thing in the morning or pre-workout. Because zümXR extends the caffeine window, avoid taking it within five to six hours of bedtime.
• Start low: If you're new to thermogenics or sensitive to stimulants, start with half a scoop to assess tolerance before moving to a full serving.
• Cycle it: Don't use Core BURN for more than eight consecutive weeks. Take a break before resuming.

Stacks Well With Core BURN

• Core PUMP (Fun Sweets Cotton Candy with VasoDrive-AP): A stimulant-free pump pre-workout is the natural complement to BURN. You get the thermogenic and energy support from BURN alongside the nitric oxide and performance benefits of PUMP, without stacking two caffeine-heavy products on top of each other.
• Core Hydrate: Proper hydration becomes more important during a caloric deficit, especially during training. Core Hydrate provides comprehensive electrolyte support to maintain performance when calories are restricted.

Who Core BURN Is For

• Serious dieters who want a complete system in one product: BURN addresses energy, cortisol, thermogenesis, and appetite suppression in a single scoop, making it a strong standalone option during a cut.
• Stimulant-tolerant users: At 200mg of total caffeine, regular coffee drinkers should find this dose comfortable. If you're stimulant-sensitive, start at half a scoop or consider whether this formula is the right fit.
• Athletes focused on natural body recomposition: The emphasis on WAT-to-BAT conversion, cortisol control, and cognitive support during a caloric deficit aligns directly with the natural bodybuilding philosophy behind the PR Series.

Conclusion: Multi-Pathway Fat Loss Done Right

Core BURN hits on a straightforward premise: fat loss is a multi-variable problem, and addressing only energy or only stimulants produces limited results.

The formula covers thermogenesis through WAT-to-BAT conversion, sustained energy from a dual-caffeine system, cortisol management via two separate adaptogens, and dedicated appetite support through SaffSerene® saffron extract. The 2023 fucoxanthin upgrade strengthened what was already a solid foundation, and the 200mg total caffeine dose is sensible for most active adults without tipping into unnecessary stimulant territory.

If you want to hear Doug Miller discuss Core's formula philosophy in his own words, Episode #219 of the PricePlow Podcast is worth your time. Core PUMP is the natural stimulant-free companion when you're ready to build a full training stack.

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