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Transparent Labs does something the supplement industry mostly refuses to: it prints exactly what is in the bottle and how much, with no proprietary blends. Its Fat Burner — now sold as Body Recomp — contains ForsLean, Capsimax, green tea extract and natural caffeine at doses that line up with the human studies. We rate the honesty highly. We rate the category honestly too, and thermogenic fat burners do very little.
Overview
Transparent Labs is a sports nutrition brand founded in 2015 on a stated policy of 100 percent formula transparency, clinically dosed ingredients and natural flavouring. Its fat burner is positioned around metabolism, focus and appetite control, and is available in both a caffeinated and a stimulant-free version.
The Label Is the Best Thing About It
No proprietary blends. Every ingredient is listed with its amount, at doses that correspond to the published human research rather than to a token sprinkle.
This matters more than it sounds. A proprietary blend lets a manufacturer list impressive-sounding ingredients in descending order without disclosing amounts, which conceals the standard trick of this industry: including a research-backed ingredient at a fraction of the researched dose so it can appear on the label. You cannot evaluate a product that will not tell you the doses, and most will not.
It is the same criticism we make of CoreAge Rx GLP-1 Support, which does publish amounts but at fibre doses far below the gram-scale used in research, and a far stronger contrast with GLP-1 Patches, which publishes no ingredient panel at all. Transparent Labs gives you what you need to judge it — and then the judgement falls to the ingredients themselves. Our guide to reading supplement labels covers what to look for.
What the Ingredients Actually Do
| Ingredient | Claim | Our read of the evidence |
|---|---|---|
| Natural caffeine | Metabolism, focus, appetite | The one ingredient with a reliable effect — modest, real, and available from coffee |
| Green tea extract (EGCG) | Thermogenesis, fat oxidation | Small effects in trials, often confounded with the caffeine it comes with |
| Capsimax (capsicum) | Thermogenesis, energy expenditure | Measurable rise in energy expenditure; small in absolute terms |
| ForsLean (Coleus forskohlii) | Body composition | The weakest of the four — small, mixed studies, no consistent weight-loss finding |
This is a reasonable, non-fraudulent formula: nothing dangerous, nothing absurd, and doses that match the research. The honest summary is that the research itself shows small effects. A thermogenic might raise daily energy expenditure by a modest number of calories, which over weeks is a real but marginal contribution to a deficit you are creating some other way. Our ingredient evidence guide covers the underlying studies.
Product Facts
| Active ingredient | Amount per serving |
|---|---|
| ForsLean (Coleus forskohlii extract) | Clinically dosed; exact amount on label, not verified by us |
| Capsimax (capsicum extract) | Clinically dosed; exact amount on label, not verified by us |
| Green tea extract | Clinically dosed; exact amount on label, not verified by us |
| Natural caffeine | Present in the standard version; omitted from the stim-free version |
| Manufacturer | Transparent Labs, established 2015 |
|---|---|
| Serving size | Capsules; exact serving size varies by product version |
| Servings per container | Not stated in the sources we could verify |
| Other ingredients | All-natural flavouring system; no proprietary blends |
| Intended use | Marketed to support metabolism, focus and appetite control alongside diet and training |
| Directions | Follow the label; do not combine with other caffeine sources without accounting for total intake |
| Warnings | Contains caffeine in the standard version. Not suitable in pregnancy or breastfeeding. Discuss with a clinician if you have cardiovascular conditions, high blood pressure, anxiety, or take any prescription medication including a GLP-1. |
| Allergens | Not stated in the sources we could verify |
| Pricing | Not verified by us — check the current listing |
| Subscription options | Not verified by us |
| Refund policy | Not verified by us |
| Shipping | Not verified by us |
The Caffeine Problem on a GLP-1
If you are on a GLP-1, the caffeinated version is the wrong choice. Dehydration-driven acute kidney injury is the most common serious adverse event with these medications, caused by the vomiting and diarrhoea they produce. Caffeine adds fluid loss on top of that.
There are three separate issues, and none is exotic:
- Fluid balance. You may already be losing fluid through GI side effects. Adding a diuretic effect while under-drinking — which is easy when appetite suppression also blunts thirst cues — moves you toward the exact complication that puts GLP-1 patients in hospital.
- Nausea. Caffeine on an empty or barely-used stomach worsens nausea, and nausea is already the main reason people abandon GLP-1 treatment. Our side effects guide covers management.
- Heart rate. GLP-1s can modestly raise resting heart rate on their own. Stacking a stimulant is worth raising with your prescriber, particularly if you have any cardiovascular history.
To Transparent Labs’ credit, it sells a stimulant-free version of the same product. That is the one to consider if you want to try this at all while on a GLP-1 — and it also removes most of what the caffeinated version was doing, which tells you something about where the effect was coming from.
Tell your prescriber whatever you take. Supplements are routinely omitted from medication lists and they should not be.
What to Expect Realistically
“Fat burner” is a category name, not a description. Nothing in this bottle burns fat; a calorie deficit does that, and these ingredients may make the deficit marginally larger. If you are also on a GLP-1, the medication is producing an effect one or two orders of magnitude larger than the supplement, and attributing results to the capsules would be a mistake.
There is also an opportunity-cost argument. The money spent here would buy more, applied to the two things that genuinely change GLP-1 outcomes: protein intake and resistance training. A month of SHRED costs about $10, and a dietitian through Fay Nutrition costs $0 to $12 a session through insurance. Both do more for body composition than any thermogenic.
Finally, note that dietary supplements are not reviewed by the FDA before sale and cannot legally be marketed as treating disease. Transparent Labs stays on the right side of that line — the claims are about supporting metabolism and focus, not curing anything, which is the correct way to describe a product like this. See supplements versus medications for the distinction.
Pros and Cons
Pros
- No proprietary blends — every ingredient and amount disclosed
- Doses correspond to the published human research
- Ingredients are researched rather than invented
- A stimulant-free version is available
- All-natural flavouring, no exaggerated claims
- Generally well tolerated compared with aggressive thermogenics
- Established brand with a consistent transparency policy since 2015
Cons
- The whole category produces small effects, honestly dosed or not
- ForsLean has the weakest evidence of the four ingredients
- Caffeine adds dehydration risk on a GLP-1
- Can worsen nausea, the main reason people quit GLP-1s
- Stacking a stimulant with a medication that raises heart rate needs clearance
- Not reviewed by the FDA before sale, as with all supplements
- The same money buys more from training or a dietitian
Who Should Use It, and Who Should Look Elsewhere
This suits you if you are not on a GLP-1, you are already training and eating in a deficit, and you want a marginal thermogenic contribution from a company that will tell you exactly what it is selling. On those terms it is one of the better products in a poor category.
Look elsewhere if you are on a GLP-1 — and if you use it anyway, take the stimulant-free version and clear it with your prescriber. If you are choosing between this and spending the money on structured training or a dietitian, choose those.
Limitations of This Review
This review is based on independent coverage of Transparent Labs checked on 7 August 2026. We were not able to read the current label ourselves, so exact milligram amounts, serving size, servings per container, allergens and pricing are recorded as unverified rather than estimated — the product is reported as fully disclosing them on pack, and you should check there. The product has been renamed from Fat Burner to Body Recomp and formulations may differ between versions. We have not taken the supplement. The GLP-1 interaction points are general pharmacology, not findings specific to this product.
Frequently Asked Questions
Does Transparent Labs Fat Burner actually work?
The ingredients have real research behind them but the effect sizes in that research are small — measured in fractions of a pound per week, not the results people expect from the category name. It is a marginal aid to a calorie deficit, not a cause of weight loss.
Can I take a fat burner while on a GLP-1?
Ask your prescriber first. The main concern is the caffeine: GLP-1s already cause nausea, vomiting and diarrhoea, and dehydration-driven kidney injury is their most common serious adverse event. Caffeine adds fluid loss and can worsen nausea and raise heart rate. A stimulant-free version avoids that specific issue.
What is in it?
Clinically dosed ingredients including ForsLean (Coleus forskohlii extract), Capsimax (capsicum extract), green tea extract and natural caffeine, with the full label disclosed and no proprietary blends.
Is there a stimulant-free option?
Yes. Transparent Labs sells a stimulant-free version of the same product, which is the more sensible choice for anyone on a GLP-1 or sensitive to caffeine.
Verdict
3.3 / 5
The most honest label in a category that does not deserve one. Real ingredients at real doses, producing a small real effect — and the caffeine is a poor fit alongside a GLP-1.
We would rather review a hundred products like this than one more patch with no ingredient panel. Transparent Labs tells you what is in the bottle, at what dose, and does not claim the impossible. That deserves the credit it gets here, and it is the reason this rates above most of the supplement shelf.
But honesty about a modest product does not make it a strong one. Thermogenics contribute at the margins of a deficit you create elsewhere, and if you are on a GLP-1 the medication dwarfs anything this can add — while the caffeine works against the hydration you need. Take the stim-free version if you take it at all, and spend the rest on protein and lifting.
Supplement Disclaimer & Review Date
These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Dietary supplements are not FDA-approved medications, are not reviewed by the FDA for safety or effectiveness before they go on sale, and are not a substitute for prescription treatment.
Nothing on this page is medical advice, and nothing here should be read as a promise of weight loss or of any particular result. Supplements can interact with prescription medications and are not appropriate for everyone. Talk to a doctor or pharmacist who knows your medical history before starting any supplement — particularly if you are pregnant or breastfeeding, take prescription medication, manage a chronic condition, or are already taking a GLP-1 medication.
Details about Transparent Labs Fat Burner come from the manufacturer's own published materials as of the date below. Ingredients, amounts, pricing, and policies change frequently — check the current label and product page before purchasing.
Last reviewed: August 7, 2026
If You Take It, Take the Stim-Free Version
On a GLP-1, caffeine works against the hydration you need. The stimulant-free option avoids that — and training and protein will do more than either.