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Guide: safety

Are Fat Burner Pills Safe? Fat Burner Side Effects, Liver Risks and Hidden Drugs

Quick answer

Fat burner pills are not safe for everyone, and "natural" does not mean safe. The main risks are too much caffeine, rare liver injury from green tea extract and garcinia, and hidden drugs in some products. For most healthy adults the FDA's caffeine guide is 400 mg a day. SodaSlim lists 138 mg of caffeine per capsule.

Written by the SodaSlim label deskUpdated

The short answer01

Are fat burner pills safe?

Are fat burner pills safe? Sometimes, for some people, at the labeled amount. Safety depends on the ingredients, the dose, your health and your medicines.

The NCCIH says many "fat burners" are untested for safety, that labels may not match what is inside, and that none of the products it reviewed has been shown effective for weight loss (NCCIH, Weight Control and Dietary Supplements). Mayo Clinic adds that "natural" does not mean safe, and that liver damage has rarely been linked to supplements (Mayo Clinic, Dietary supplements for weight loss).

So the honest answer is "ask first." The table lists the three problems that come up most, and where each one comes from.

Three ways fat burner pills can cause harm.
RiskWhat sources sayWho should be most careful
Too much caffeineFast heartbeat, palpitations, high blood pressure, insomnia, anxiety, nausea (FDA, Spilling the beans: how much caffeine is too much)Anyone with a heart rhythm problem, high blood pressure or anxiety (MedlinePlus, Caffeine)
Liver injuryGreen tea extract pills and garcinia have been linked to liver injury (NCCIH, Green tea) (NCCIH, Garcinia cambogia)Anyone with liver disease or on drugs that affect the liver
Hidden drugsSome tainted products hold drugs not on the label (FDA, Tainted weight loss products)Anyone buying from unknown sellers

Side effects02

What are the side effects of fat burner pills?

The most common fat burner side effects come from stimulants: a racing heart, jitters, poor sleep, an upset stomach and headache.

These are the effects the FDA lists for too much caffeine (FDA, Spilling the beans: how much caffeine is too much). The NIH adds that green tea extract can cause constipation, nausea and higher blood pressure (NIH ODS, Weight loss supplements (consumers)). Garcinia can cause headache, nausea and diarrhea (NCCIH, Garcinia cambogia).

Stimulants stack. Several fat burner lines contain caffeine, and extracts such as green tea and green coffee add some more. The NIH warns that stimulants combined raise risk (NIH ODS, Dietary Supplements for Weight Loss (health professionals)). The ephedra-free "high caffeine" products the NCCIH mentions can raise heart rate and cause abnormal rhythms (NCCIH, Weight Control and Dietary Supplements).

Get care now

Chest pain, fainting, a racing or pounding heartbeat that will not settle, a seizure, or severe confusion call for 911. For a suspected caffeine overdose, Poison Help is 1-800-222-1222 (Cleveland Clinic, Caffeine overdose).

  1. Chest pain, fainting, a racing heartbeat that will not settleCall 911. Caffeine overdose and seizures are emergencies; Poison Help is 1-800-222-1222.
  2. Yellow skin or eyes, dark urine, severe stomach painStop and see a doctor the same day. These are liver warning signs listed for green tea extract.
  3. A seizure or severe confusionCall 911. Seizures are reported with rapid intake of about 1,200 mg of caffeine.
  4. Weight loss promised no matter what you eatOne of the FTC's red flags: loss without diet or exercise, permanent loss, or blocking fat absorption.
  5. Jitters, poor sleep or anxiety that keep goingCut back caffeine from every source and talk to your doctor or pharmacist.

Signs from (Cleveland Clinic, Caffeine overdose) (MSK, Green tea (About Herbs)) (FTC, Seven red flags for bogus weight-loss claims). This list is not complete, and a supplement is never a reason to wait.

The liver03

Can fat burners harm your liver?

Yes, rarely. Liver injury is uncommon, but it has been reported with green tea extract pills and with garcinia.

A cup of green tea is not the same as an extract. Drinking it is not linked to safety concerns in adults, while extract pills have been (NCCIH, Green tea). In one study of 1,414 U.S. liver injury cases, 40 (3%) were blamed on green tea products, and 3 of those patients needed a transplant (NIDDK repository, HLA-B*35:01 and green tea liver injury). EFSA's review found that 800 mg a day of EGCG from supplements may be linked to early signs of liver damage (IFST, EFSA green tea catechins safety assessment).

For garcinia, the NCCIH cites numerous reports of liver toxicity, several severe, and a possible interaction with drugs that affect the liver or serotonin (NCCIH, Garcinia cambogia).

The signs to watch: belly pain, dark urine, yellow skin or eyes (MSK, Green tea (About Herbs)). Stop the supplement and see a doctor the same day. More in the liver injury warning signs guide.

Hidden drugs04

Do fat burner pills contain hidden drugs?

Some do. The FDA says tainted weight loss products hold hidden ingredients and are sometimes sold as "all-natural" supplements (FDA, Tainted weight loss products).

One FDA notice found two substances not on the label of a weight loss product. One was sibutramine, pulled from the market in October 2010 because it can raise blood pressure and heart rate, and may interact with other medicines in life-threatening ways (FDA, Public notification: Body Shape Weight Loss System).

The FDA also warns that its list covers only a small fraction of tainted products. Absence from the list does not mean a product is clean (FDA, Tainted weight loss products). Nothing we found says SodaSlim contains a hidden drug. No lab report is published for it, so the label is what a buyer can check.

SodaSlim: 30 capsules, 30-day bottle1 capsule a day · 2, 3 or 6 bottles · price and guarantee terms at checkout

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The SodaSlim numbers05

How does a SodaSlim capsule compare with these risks?

SodaSlim is a capsule, not a drink, and it is a caffeine-containing fat burner style product. Its label prints every amount, which lets you do the arithmetic.

Caffeine anhydrous is 138 mg per capsule, or 34.5% of the FDA's 400 mg guide (FDA, Spilling the beans: how much caffeine is too much). The green tea and green coffee extracts add some caffeine too, but the label does not say how much, so the true total is 138 mg plus a little more. The green tea extract is 130 mg, with about 58.5 mg of EGCG from the label's 45% figure. That is well under the 800 mg levels in the liver studies (MSK, Green tea (About Herbs)) (IFST, EFSA green tea catechins safety assessment).

Low is not the same as safe for you. The label itself says to consult a physician first, especially with a medication or medical condition, and that the capsule is not for anyone under 18 or pregnant or nursing.

  • Caffeine anhydrous

    34.5% of the reference amount
    SodaSlim, 1 capsule (label)138 mg
    FDA guide for most healthy adults, all sources400 mg

    Label amount per capsule, next to the research amount (FDA, Spilling the beans: how much caffeine is too much).

  • Green tea extract

    16.2% of the reference amount
    SodaSlim, 1 capsule (label)130 mg
    Daily extract amount where liver enzymes rose800 mg

    Label amount per capsule, next to the research amount (MSK, Green tea (About Herbs)).

  • Green coffee bean extract

    65% of the reference amount
    SodaSlim, 1 capsule (label)130 mg
    Daily amount the NIH calls seemingly safe for 12 weeks200 mg

    Label amount per capsule, next to the research amount (NIH ODS, Weight loss supplements (consumers)).

  • EGCG in the green tea extract (about)

    7.3% of the reference amount
    SodaSlim, 1 capsule (label)58 mg
    Daily EGCG from supplements where EFSA saw early liver signs800 mg

    Label amount per capsule, next to the research amount (IFST, EFSA green tea catechins safety assessment).

Brown bars: the daily amount on the SodaSlim label (one capsule a day). Lime bars: a reference amount that a source reports, set to full width: a limit or the level where a safety signal appeared. A reference amount says what was tested or flagged, not what works for you, and no study tested SodaSlim.

Before you buy06

How can you check whether a fat burner is safe for you?

Check the label, count your caffeine, and ask a pharmacist. Those three steps catch most problems.

  1. Read every amount

    A label that prints each line, like this one, lets you compare it with a limit. A hidden blend does not.

  2. Count the caffeine you already have

    Brewed coffee runs 113 to 247 mg per 12 fl oz (FDA, Spilling the beans: how much caffeine is too much). Add the capsule to your cups before you decide.

  3. Ask about your medicines

    Green tea extract has listed interactions with nadolol, verapamil, statins and tamoxifen (MSK, Green tea (About Herbs)). Ask a pharmacist about blood pressure, diabetes and mood medicines too.

  4. Report a bad reaction

    Tell your provider and the maker, and report to the FDA at 800-FDA-1088 (NIH ODS, Dietary Supplements: What You Need to Know).

Keep taking prescribed medicine as directed. The SodaSlim side effects page and the supplements and medicines guide go deeper.

FAQ07

SodaSlim questions people ask

What are the side effects of fat burner pills?

Most come from caffeine: fast heartbeat, palpitations, jitters, trouble sleeping, nausea and headache (FDA, Spilling the beans: how much caffeine is too much). Some extracts add constipation or higher blood pressure (NIH ODS, Weight loss supplements (consumers)). Rarely, liver injury occurs, with dark urine or yellow skin or eyes as warning signs.

Can fat burners cause heart problems?

They can raise heart rate and blood pressure because of caffeine and other stimulants (MedlinePlus, Caffeine). People with a heart rhythm problem or high blood pressure should check with a provider first. Chest pain or fainting needs emergency care.

Are natural fat burners safer?

No. The NCCIH and Mayo Clinic both say natural does not mean safe (NCCIH, Weight Control and Dietary Supplements) (Mayo Clinic, Dietary supplements for weight loss). Plant extracts can still affect the liver and interact with medicines.

Is it safe to take a fat burner with coffee?

It adds up. Caffeine from the pill and from your cups counts toward the same day. The FDA guide of 400 mg a day is about two to three 12-ounce cups of coffee (FDA, Spilling the beans: how much caffeine is too much).

Who should not take fat burner pills?

Anyone under 18, pregnant or nursing, and people with heart, liver, thyroid, anxiety or blood pressure conditions should ask a doctor first (MedlinePlus, Caffeine) (NIH ODS, Weight loss supplements (consumers)). Check the label caution of any product you consider.

How do I know a fat burner has no hidden drugs?

You cannot tell from the bottle. The FDA says tainted products can be sold as supplements, and its list is incomplete (FDA, Tainted weight loss products). Buy only from the maker's checkout and ask for a lab report.

Sources (16)
  1. Spilling the Beans: How Much Caffeine Is Too Much?U.S. Food and Drug Administration, 2024
  2. CaffeineMedlinePlus (U.S. National Library of Medicine), 2021
  3. Caffeine OverdoseCleveland Clinic, 2024
  4. Dietary Supplements for Weight Loss: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2026
  5. Dietary Supplements for Weight Loss: Fact Sheet for ConsumersNIH Office of Dietary Supplements, 2021
  6. Weight ControlNational Center for Complementary and Integrative Health, 2017
  7. Dietary supplements for weight lossMayo Clinic, 2024
  8. Green TeaNational Center for Complementary and Integrative Health, 2025
  9. Garcinia CambogiaNational Center for Complementary and Integrative Health, 2025
  10. Green TeaMemorial Sloan Kettering Cancer Center, 2026
  11. HLA-B*35:01 and Green Tea-Induced Liver InjuryNIDDK Central Repository record of a Hepatology paper (DILIN network), 2021
  12. EFSA assesses safety of green tea catechinsInstitute of Food Science and Technology (summary of EFSA opinion), 2018
  13. FTC Stops Bogus Ads for "Bio Trim" and Other Weight-loss ProductsFederal Trade Commission, 2005
  14. Tainted Weight Loss ProductsU.S. Food and Drug Administration, 2026
  15. Public Notification: Body Shape Weight Loss System Contains Hidden Drug IngredientsU.S. Food and Drug Administration, 2024
  16. Dietary Supplements: What You Need to KnowNIH Office of Dietary Supplements, 2023

Who wrote this08

Written and reviewed by

Written byThe SodaSlim label deskThesodaslim, USA Authorized SodaSlim Retailer

Pages built from the label, the seller’s materials and linked NIH, FDA, FTC, Mayo Clinic and peer-reviewed sources.

Medically reviewed byDr. Richard Kowalsky, MD, PhysicianRole: Medical reviewerReview date: October 28, 2026

Last updated . Read our editorial standards and how we check reviews. This website is the information site of Thesodaslim, a USA authorized SodaSlim retailer. It is not the manufacturer or the distributor named on the label. We earn money when you buy through our order links.

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