Retra Burn Review: The Same 15.47 mg Formula Behind Cognizil and Hawaiian Harmony, Now Pitched for Weight Loss

Key takeaways: Retra Burn Pro is sold as liquid weight-loss drops, but its formula is identical to two products we already reviewed: Cognizil (sold for memory) and Hawaiian Harmony (sold for blood sugar). All three list chromium at 7 mcg plus the same 21-ingredient proprietary blend totaling 15.47 mg, in the same order. The page claims the drops "burn fat efficiently," boost metabolism, and curb appetite, yet it cites no clinical trial of the finished formula. The dose math is decisive: the entire 21-ingredient blend is 15.47 mg, while trials of its individual ingredients used grams per day. Retra Burn is the 11th product we have traced to the same seller family (PO Box 12730, Ogden, UT). A separate caution: the name "Retra Burn" is nearly identical to retatrutide, an investigational obesity drug, and the two have nothing to do with each other.

Contents

• The verdict
• What the page promises
• The label: what is actually in the bottle
• The same formula, three different pitches
• Dose math: why 15.47 mg ends the argument
• Claim vs evidence, ingredient by ingredient
• Price and value
• Who is behind Retra Burn
• A name that invites confusion
• Senior safety notes
• Regulatory history
• The bottom line
• Sources

The Verdict

Retra Burn Pro is sold as weight-loss drops. Its formula is the same 15.47 mg, 21-ingredient blend we already found in Cognizil (sold for memory) and Hawaiian Harmony (sold for blood sugar).

That is the whole story in one sentence. One formula, three health pitches, and no clinical trial of the finished product behind any of them. The page claims the drops help the body "burn fat efficiently and naturally," but the entire proprietary blend is 15.47 mg per serving.

For context, clinical trials of this formula's individual ingredients used hundreds or thousands of milligrams per day. Chromium, the only ingredient with a disclosed dose (7 mcg), sits 20 to 140 times below the doses used in weight-loss trials.

Bottom line: as a weight-loss product, Retra Burn does not hold up. The Supplement Decoded Team does not recommend it for weight management.

What the Page Promises

The headline reads "Discover How Retra Burn Pro Can Support Healthy Weight Loss." The hero copy calls it "the powerful, science-backed formula designed to help your body burn fat efficiently and naturally, without extreme diets, intense workouts."

Five benefit cards make the specific claims: the drops "boost fat loss" by targeting "hard-to-lose areas, especially around your belly, hips, and thighs"; "boost your metabolism" to "burn more calories, even while you're at rest"; "curb your appetite" by reducing cravings and keeping you fuller for longer; provide "steady energy"; and "support healthy digestion."

The word "science-backed" appears in the hero. But a full review of the page found no cited study anywhere: no trial of the finished formula, no named research, no links to evidence. We also found no testimonials, no before-and-after photos, and no countdown timers. The only scarcity language is a mild "Claim Your Retra Burn Pro Pack Now While Supplies Last!"

The page's own disclaimer is more honest than its marketing. It says individual results are not guaranteed, outcomes depend on diet and lifestyle, and users should "follow the suggested use for at least 180 to 210 days to evaluate effectiveness." Keep that number in mind for the price section.

The Label: What Is Actually in the Bottle

Per the Supplement Facts panel shown on the sales page (serving size: 1 ml, 30 servings per container; directions: shake well, take 1 dropperful daily, place in mouth and swallow), each serving contains:

Other ingredients: water, natural flavors, potassium sorbate, stevia, xylitol, citrus extract. The label notes the product is made in the USA with globally sourced ingredients and "manufactured in an FDA registered facility." A registered facility is not an approved product: the FDA does not approve dietary supplements before sale, and registration should never be read as an agency endorsement.

One label detail deserves a careful explanation. Some ingredients carry footnotes saying they are sourced from a 20:1 or 10:1 concentrate. A 20:1 ratio describes how much raw plant material went into making the extract, not a dose that is 20 times larger. It does not change the math: the blend total is still 15.47 mg, and individual amounts are still undisclosed.

The Same Formula, Three Different Pitches

This is the finding that matters most. The Retra Burn label is not just similar to two products we already reviewed. It is identical to them.

All three are amber glass dropper bottles with the same serving size (1 ml, 30 servings). All three carry the same chromium disclosure and the same 15.47 mg proprietary blend, with the 21 ingredients listed in the same order. The only thing that changes between the three products is the health story on the page.

This pattern is the mirror image of the Hawaiian Harmony finding: there, the bottle said "blood sugar" while the page's own disclaimer said "cognitive function." Here, a formula with no weight-loss evidence at meaningful doses is dressed in weight-loss marketing. The pitch changes; the bottle does not.

Dose Math: Why 15.47 mg Ends the Argument

The blend total is 15.47 mg across 21 ingredients. Divided evenly, that averages under 0.74 mg per ingredient. The label discloses no individual amounts, so no buyer can verify any ingredient's actual dose.

Compare that ceiling against the doses used in real human research:

No combination of the 21 ingredients can escape this arithmetic. Even if one ingredient took the entire 15.47 mg, it would still fall 8 to 200 times short of the doses used in the research the page's "science-backed" language implies. The remaining ingredients (maca, grape seed, guarana, eleuthero, astragalus, coleus forskohlii, cayenne, grapefruit seed, panax ginseng, glutamine, tyrosine, arginine, beta alanine, monoammonium glycyrrhizinate, tryptophan) sit in the same undisclosed, sub-milligram position.

Claim vs Evidence, Ingredient by Ingredient

The page's headline claims rest on five promises. Here is what trusted sources actually say about the ingredients that could plausibly relate to them.

• "Burn fat efficiently" and "boost your metabolism." The most relevant ingredient is chromium, the only one with a disclosed dose. The NIH Office of Dietary Supplements' weight-loss fact sheet reviewed the trials: 137 to 1,000 mcg/day for 8 to 26 weeks produced about 0.5 kg (roughly one pound) more weight loss than placebo, which the reviewers called of "uncertain clinical relevance." A 2019 meta-analysis of 21 trials found 0.75 kg, described as having "little clinical significance." Retra Burn provides 7 mcg, far below even the lowest studied dose, so it cannot claim even that one-pound effect.
• L-carnitine and fat metabolism. A 2020 meta-analysis of 37 randomized trials (2,292 participants) found the maximum weight effect at 2,000 mg of L-carnitine per day: about 1.2 kg. That is the best-case ingredient-level evidence in this formula, and it requires a dose roughly 130 times larger than the entire 15.47 mg blend.
• "Curbs your appetite" (African mango, gymnema, green tea). The African mango trial (Ngondi et al., 2005) used 3,150 mg per day, about 200 times the whole blend. Gymnema trials used around 600 mg per day, about 40 times the whole blend. Green tea weight-loss trials used hundreds of milligrams of EGCG per day. None of these amounts is reachable inside a 15.47 mg total.
• Guarana and "steady energy." Guarana naturally contains caffeine, so any felt energy effect would come from an undisclosed amount of caffeine. The Mayo Clinic notes that up to 400 mg of caffeine per day appears safe for most healthy adults, but caffeine can interact with some medications and sensitive people feel effects at far lower amounts. A product that hides its caffeine content makes that judgment impossible.
• Raspberry ketones. This ingredient is often marketed for fat burning, but we found no published human trial testing raspberry ketones alone for weight loss. Animal and cell studies do not establish human effects.
• GABA, licorice compound, and the rest. Human GABA research (2020 systematic review) studied 20 to 100 mg for stress and sleep, not weight loss, and found no weight evidence. Monoammonium glycyrrhizinate is a licorice compound; the National Center for Complementary and Integrative Health notes licorice can raise blood pressure and lower potassium, which matters for the senior-safety section below.

The honest summary: the page's five promises require doses this formula cannot contain. The "science-backed" language borrows credibility from ingredient research conducted at doses 40 to 200 times larger than what fits in the bottle.

Price and Value

The pricing is fully visible on the page, with three tiers, all one-time purchases (no subscription or auto-ship language anywhere):

The $79/$69/$49 tier structure is identical to every other product in this seller family we have reviewed. The cards advertise savings of up to $780 but show no struck-through anchor prices; the savings figures imply a regular price of $179 per bottle that never appears on the page.

Price-per-day math: at one dropper daily, the 6-bottle pack costs about $1.63 per day, the 3-bottle about $2.30, and the 2-bottle about $2.80 including shipping. That is the daily price of a formula with no plausible path to its advertised effects.

One detail worth noting: the page advises using the product for 180 to 210 days before judging it, but the money-back guarantee is 180 days. A buyer who follows the page's own evaluation advice to the full 210 days would be outside the refund window. Checkout runs through the third-party processor Digistore24.

Who Is Behind Retra Burn

The label names the distributor as Retra Burn, PO Box 12730, Ogden, UT 84404, with the phone +1 (877) 257-0710 and the email [email protected]. That is the same PO box, phone, and label email behind FlexGuard, ProstaFlow, MindHoney, NeuroPulse Pro, Cognizil, Hawaiian Harmony, Evo Slim, Max Vitalize, Digest Flow, and Quiet Tone. Retra Burn is the 11th product we have traced to this family.

Company transparency is thin. All five footer legal links (Contact Us, Terms and Conditions, Privacy, Returns and Refunds, Anti-Spam) are dead links that go nowhere, so no terms, privacy policy, or refund policy text exists to read. No legal company entity is named anywhere; the distributor is listed only as "Retra Burn." No named people, no About page.

The footer does carry the standard FDA disclaimer (these statements have not been evaluated by the FDA; the product is not intended to diagnose, treat, cure, or prevent disease), a Digistore24 processor disclaimer, and an "author's opinion" disclaimer. It also carries orphaned boilerplate stating that "some names and personal identifying information on this site have been changed to protect the privacy of individuals," even though no names or testimonials appear anywhere on the page.

On marketing restraint, the page is a quiet checkout funnel: no testimonials, no countdown timers, no fake scarcity, no disease claims, no subscription trap, and the disclaimer openly says results vary and the product may not work for everyone. That restraint is better than the hype-driven pages in this space, but it does not fix the formula problem.

A Name That Invites Confusion

One more warning, and it is an important one. "Retra Burn" is nearly identical in spelling and sound to retatrutide, the investigational triple-hormone-receptor agonist obesity drug studied in a 2023 phase 2 trial published in the New England Journal of Medicine.

Retatrutide is a research drug, not an approved medicine you can buy, and these drops contain no retatrutide and work nothing like it. But a shopper who has heard about retatrutide's trial results and searches for it could easily land on Retra Burn instead. If you arrived here looking for the drug from the headlines, this is not it. Talk to your doctor about legitimate, evidence-based weight-management options instead.

Senior Safety Notes

Older adults should read this section, because the safety issues here are real even though the weight-loss evidence is not.

• Green tea extract and the liver. The blend contains green tea leaf extract at an undisclosed dose. Concentrated green tea extracts have been linked to liver injury in published case reports, which is why the amount matters. Here the amount is hidden, so neither you nor your pharmacist can assess the exposure. Our supplement interactions guide explains how to check.
• Guarana means hidden caffeine. Guarana naturally contains caffeine, and the label discloses no amount. Caffeine can raise blood pressure and heart rate and interact with some medications. Older adults on blood pressure drugs or with heart rhythm concerns should treat any undisclosed-caffeine product as a question for their prescriber.
• Licorice compound and blood pressure. The blend includes monoammonium glycyrrhizinate, a licorice-derived compound. The National Center for Complementary and Integrative Health notes that licorice can raise blood pressure and lower potassium, and can interact with diuretics and heart medications commonly prescribed to older adults. The dose here is undisclosed.
• Hidden doses make safety checks impossible. A proprietary blend that discloses only a 15.47 mg total across 21 ingredients means your pharmacist cannot assess interactions, duplicates, or excesses. Safety reviews require amounts, not just names.
• Weight loss at older ages deserves medical guidance. Unintended or rapid weight loss in older adults can signal underlying conditions, and even intentional weight loss should preserve muscle and bone. A supplement is not a weight-management plan. Our supplement dosage guide explains why hidden doses should be a deal-breaker.

Regulatory History

No FDA warning letter or FTC enforcement action naming Retra Burn was found as of October 18, 2026. That is worth stating plainly: this teardown is about the mismatch between the marketing and the formula, not about a regulator having acted.

Absence from regulator lists proves nothing on its own. The FDA's own health-fraud pages note that their lists cover only a small fraction of the contaminated products on the market, and that a product not appearing on the list does not mean it is safe.

The Bottom Line

Retra Burn Pro is the third product we have found with the identical 15.47 mg, 21-ingredient formula: first Cognizil for memory, then Hawaiian Harmony for blood sugar, now Retra Burn for weight loss. The bottle never changes; only the health story on the page does.

The dose math is decisive. The entire blend is 15.47 mg, while the published research on its individual ingredients used doses 40 to 200 times larger. Chromium, the only disclosed ingredient at 7 mcg, sits far below even the lowest studied dose, and the best-case trial result for chromium was about one pound of extra weight loss, described by reviewers as clinically uncertain.

The page is a quiet checkout funnel with honest disclaimers and no hype tactics, and the guarantee terms are clearly stated. But restraint in marketing does not substitute for evidence. At $1.63 to $2.80 per day, buyers are paying real money for doses that cannot plausibly deliver the advertised effects.

If weight management is your goal, the evidence-based path runs through your doctor, not through drops with hidden sub-milligram doses. And if you came looking for retatrutide, the investigational drug in the headlines, know that these drops are not it.

Sources

1. Dietary Supplements for Weight Loss: Fact Sheet for Health Professionals, NIH Office of Dietary Supplements (chromium: trials of 137 to 1,000 mcg/day for 8 to 26 weeks produced about 0.5 kg more weight loss than placebo, of "uncertain clinical relevance")
2. Chromium: Fact Sheet for Health Professionals, NIH Office of Dietary Supplements (2019 meta-analysis of 21 trials, 200 to 1,000 mcg/day: 0.75 kg weight loss, effects of "little clinical significance")
3. Talenezhad N et al. Effects of L-carnitine supplementation on weight loss and body composition: systematic review and meta-analysis of 37 randomized controlled trials. Clin Nutr ESPEN. 2020 (maximum effect at 2,000 mg/day: 1.21 kg weight reduction)
4. Ngondi JL et al. The effect of Irvingia gabonensis seeds on body weight and blood lipids of obese subjects in Cameroon. Lipids Health Dis. 2005 (3,150 mg/day trial dose)
5. Gaytán Martínez LA et al. Effect of Gymnema sylvestre administration on glycemic control, insulin secretion, and insulin sensitivity in patients with impaired glucose tolerance. J Med Food. 2021 (randomized trial: 300 mg twice daily, 600 mg/day total)
6. Drug-Induced Liver Injury Network review: concentrated green tea extracts linked to liver injury in published case reports
7. Caffeine: How much is too much? Mayo Clinic (up to 400 mg/day appears safe for most healthy adults; caffeine can interact with some medications)
8. Licorice Root: Usefulness and Safety, National Center for Complementary and Integrative Health (licorice can raise blood pressure and lower potassium; interacts with diuretics and heart medications)
9. Hepsomali P et al. Effects of oral GABA administration on stress and sleep in humans: systematic review. Front Neurosci. 2020 (human studies used 20 to 100 mg; no weight-loss evidence)
10. Jastreboff AM et al. Triple-hormone-receptor agonist retatrutide for obesity: a phase 2 trial. N Engl J Med. 2023 (investigational drug; not an approved medicine)

Fact-checked by the SupplementDecoded Research Editorial Team

Review note: This review covers the Retra Burn Pro page as it appeared in October 2026, the version showing purple and gold branding with "Retra Burn Pro" page branding and "Retra Burn" bottle labels, amber glass dropper bottles (1 ml serving, 30 servings), the 7 mcg chromium and 15.47 mg 21-ingredient proprietary blend label, $79/$69/$49 pricing tiers ($158/$207/$294) with a 180-day money-back guarantee and a 180 to 210 day suggested evaluation period, five dead footer legal links, and checkout through Digistore24. Lookalike sites under the same product name exist and may show different content.