How to Read a Fat Burner Label: A Practical Checklist
Updated 2026-10-08 · Thermo Notes Editorial Team
Disclosure: some links on this page are affiliate links. If you buy through them we may earn a commission, at no extra cost to you. This content is for information only and is not medical advice — talk to your doctor before starting any supplement.
Most fat burners are sold through long video pages that show the label only as an image, if at all. This checklist helps you find the information that matters, whether you are looking at a bottle in your hand or a sales page on your phone.
Where is the Supplement Facts panel?
In the US, dietary supplements must carry a Supplement Facts panel listing serving size, servings per container and the amount of each dietary ingredient, except for ingredients grouped in a proprietary blend. On sales pages it often appears only as a small image near the bottom or in an "ingredients" section. If you cannot find it, ask the vendor before you pay.
What is a proprietary blend and why does it matter?
A proprietary blend lists ingredients in descending order by weight, with a single total for the whole blend instead of individual amounts. Brands use it to protect their formula. For buyers, it means:
- you cannot compare doses with the amounts used in research,
- the first ingredient may make up most of the blend and the rest very little,
- you cannot calculate the caffeine content if a caffeine source is inside.
Several products in our guide, including OrexiBurn, LipoSlend and Ignitra, describe their formulas as proprietary blends.
How do I spot hidden stimulants?
Search the label for guarana, green tea, black or purple tea, yerba mate, green coffee bean, kola nut, caffeine anhydrous and cocoa. Also watch for bitter orange (synephrine) and yohimbe, both stimulants the NIH Office of Dietary Supplements reviews for safety concerns (ODS). A "No Stimulants" badge does not override the ingredient list: PurpleBurn Pro, for example, carries that badge while listing two teas. Our caffeine guide has the full list.
What label checklist should I use?
| Check | What to look for | Why it matters |
|---|---|---|
| Serving size | Number of capsules per day | Affects real cost per day |
| Doses | mg per ingredient | Lets you compare with research |
| Caffeine | Total mg, or caffeine sources | Daily limit and sleep |
| Fiber | Glucomannan, inulin, psyllium | Needs water; can affect drug absorption |
| Minerals | Sodium, calcium, magnesium | Matters for BHB salts and kidney or heart conditions |
| Allergens | Pollen, shellfish, soy, gluten | Allergic reactions |
| Warnings | Pregnancy, age, medication notes | Who should not take it |
| Manufacturer | Company name and address | Accountability for returns and questions |
What sales-page claims are red flags?
- "FDA approved." Dietary supplements are not FDA approved. "Made in an FDA-registered facility" refers to the building, not the product.
- "Clinically proven" without a link to a study of the product itself.
- Doctor or celebrity endorsements you cannot verify.
- Countdown timers and "only today" prices that reset on reload.
- Contradictions, such as "no stimulants" next to caffeine sources, or two different guarantee lengths on the same page.
- Ingredients or prices shown only in images, which makes them hard to check and quote.
How do I check the money-back guarantee?
Read the refund policy itself, not just the badge. Look for:
- Length and whether it starts from the order, shipment or delivery date (the Thermo Burn Pro policy counts from shipment).
- Whether empty bottles are accepted (SeroBurn says they are).
- Who pays return shipping.
- How to contact the seller and what proof you need.
Guarantees in our guide range from 30 days (Vittaburn) to 180 days (Ignitra).
How do I check for drug interactions?
Write down every ingredient and bring the list to a pharmacist or doctor. Common interactions in this category include caffeine with stimulant drugs and some antidepressants; green tea extract with nadolol and atorvastatin (NCCIH: Green tea); berberine with diabetes medicines (NCCIH: Berberine); valerian with sedatives (NCCIH: Valerian); and ashwagandha with thyroid medicine (NCCIH: Ashwagandha).
See Ignitra's ingredients on the official site
What do "natural," "non-GMO" and "made in the USA" mean on a label?
These terms describe sourcing or manufacturing, not safety or effectiveness. "Natural" has no strict regulatory definition for supplements. "Non-GMO" refers to how ingredients were grown. "Made in the USA" may mean the product was manufactured or packaged in the US, even from imported ingredients, as Ignitra's page itself notes. None of these replaces a full, dosed ingredient list.
Should I look for third-party testing?
Independent certification programs test supplements for identity, purity and label accuracy. A seal from a recognized program on the bottle adds confidence that the label matches what is inside. A sales page that says ingredients are "third-party tested" without naming the lab, as SeroBurn's does, is less informative. It is reasonable to ask the vendor which lab did the testing and whether a certificate of analysis is available.
How do I calculate the real cost?
Divide the total price by the number of days the package lasts at the label dose. For example, a 6-bottle bundle at $294 lasting 180 days costs about $1.63 per day. Add shipping where it applies. Bundles lower the daily cost but raise the upfront risk, which is why the guarantee length matters.
When should I stop a fat burner?
Stop and contact a health professional if you notice palpitations, chest pain, severe headache, fainting, persistent insomnia, yellowing skin or eyes, dark urine, severe abdominal pain or an allergic reaction. Also stop if you become pregnant or start a new medication, and recheck with your doctor.
Where can I report a problem with a supplement?
In the US, side effects from dietary supplements can be reported to the FDA through its Safety Reporting Portal or MedWatch. Your doctor can also report on your behalf.
Bottom line
A good label tells you exactly what you swallow and how much. When a product hides doses, stimulants or refund terms, treat that as part of your decision. For a summary of what each product in our guide discloses, see the comparison table on our home page.
Sources consulted: ods.od.nih.gov, nccih.nih.gov.
Frequently asked questions
Are proprietary blends bad?
Not necessarily harmful, but they hide individual doses, so you cannot compare amounts with research or calculate caffeine content.
Can a supplement be FDA approved?
No. The FDA does not approve dietary supplements before sale. A facility can be FDA-registered, which is a different thing.
What if the label is only shown in an image?
Zoom in if possible, or ask the vendor for the full Supplement Facts before ordering.