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Dietary supplement

Fat Erase Ingredients & Drug Interactions

by Fitness Labs

Fat Erase label
See full label image
Capsule Category: Fiber And Other Nutrients
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Fat Erase against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Fat Erase is a dietary supplement by Fitness Labs with 1 active ingredient. Its ingredients are commonly taken for weight management, lowering cholesterol, wound care.Based on those ingredients, 3 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are LipoSan Ultra Chitosan. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Fat Erase by Fitness Labs

Ask about any prescription or over-the-counter medication and we check it for interactions with Fat Erase by Fitness Labs — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Fat Erase by Fitness Labs

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 30, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

Fat Erase contains one active ingredient: LipoSan Ultra Chitosan, a fiber derived from shellfish shells. Chitosan works in your digestive tract by binding to fat and cholesterol, which may help reduce how much your body absorbs.

The capsule itself is made from gelatin, and the inactive ingredients include succinic acid and rice powder.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: weight management and fat absorption blocking.
  • We looked for evidence on: Obesity, Hypercholesterolemia, lipid metabolism, dietary fat binding.
  • The strongest evidence on file: Chitosan is rated "Possibly Effective" for Obesity (Natural Medicines).
  • Also on file: Chitosan is rated "Insufficient Reliable Evidence To Rate" for Hypercholesterolemia.

The evidence for chitosan in Fat Erase is mixed. For obesity and postoperative recovery (healing after surgery), the data suggests it may be effective—though the quality of research is limited.

For high blood pressure, there's also possibly effective evidence. For Crohn disease and dry eye, we don't have enough reliable evidence to say whether it works.

The evidence, ingredient by ingredient Chitosan

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Chitosan is generally well tolerated in the short term, but quality safety data is limited. The most common side effects are constipation, diarrhea, gas, stomach discomfort, and nausea.

Some people report steatorrhea (excess fat in stools). One person with kidney failure reported itching during treatment, though it's unclear whether chitosan caused it.

Because chitosan is made from shellfish, anyone with a shellfish allergy should avoid it. The safety data isn't adequate for pregnancy or breastfeeding—the facts advise against use in both cases.

Talk with your doctor or pharmacist about whether this product is right for your individual situation.

Side effects, ingredient by ingredient Chitosan

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Chitosan.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs.
  • For scale: 3 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before you take Fat Erase, double-check your medications with your doctor or pharmacist if you use warfarin (blood thinner)—chitosan may increase your bleeding risk. Also flag acyclovir (antiviral) or any other prescription medication you're on.

No interactions are documented for the inactive ingredients we hold data for.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Fat Erase might be worth considering if you're looking at a weight-loss supplement backed by some limited evidence. But if you take warfarin, acyclovir, or any other prescription drugs, you need to clear it with your own doctor or pharmacist first—the interactions here can be real.

Also steer clear if you're allergic to shellfish, pregnant, or breastfeeding.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Feb 24, 2017.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Fat Erase, straight from the product label.

Brand Fitness Labs
Barcode (UPC) 654186942755
Net contents 120 Capsule(s)
Market status On market
Date entered into DSLD Feb 24, 2017
DSLD ID 70430
Product type Fiber And Other Nutrients
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Fat Erase by Fitness Labs, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
3 Capsule(s)
Maximum serving Sizes:
3 Capsule(s)
Servings per container
40
UPC/BARCODE
654186942755
IngredientAmount% DV
LipoSan Ultra Chitosan1.5 Gram(s)--

Other ingredients: Gelatin, Succinic Acid, Rice powder

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
General Statements

If you've ever heard of chitosan, you might know of its positive benefits. However, not all chitosan is created equal. Under laboratory conditions, regular chitosan products take up to two hours to fully dissolve in your stomach, making it mostly ineffective. By the time regular chitosan dissolves, most of the dietary fat will have already been processed and absorbed into the body. Fat Erase, on the other hand, uses a patented form of chitosan (LipoSan Ultra) that has been processed to increase its solubility in stomach acid in 3-5 minutes instead of two hours as for other chitosan products. With this improvement, Fat Erase is able to bind almost three times as much fat as the regular and high density products on the market. That's because the true benefit of Fat Erase occurs in the digestive tract. When taken at mealtime, its extremely fast solubility makes it available to complex with dietary fat for almost the entire time (1.5 to 2 hours) that the ingested food is in the stomach. By the time the fat/chitosan emulsion reaches the small intestine and begins to gel, Fat Erase has had the opportunity to complex far more fat -- up to 3 times more -- than regular chitosan, which still may not be fully dissolved. The complexed fat is trapped in the gel and protected from enzymatic (lipase) breakdown into absorbable free fatty acids. This trapped fat is now unavailable for absorption and is effectively removed from the body as waste. Randomized, double-blind, placebo controlled trials -- the gold standard of scientific study -- have shown promising results for this patented form of chitosan on weight loss. In one study of 59 overweight and mildly obese women, both mean weight and BMI in the treatment group significantly decreased compared to baseline over 8 weeks without the benefit of a reduced caloric diet or exercise. While the placebo group gained 1.5 kg (3.3 lbs.), the treatment group lost 1 kg (2.2 lbs.) -- a 5 lb. difference!

Potency Purity Guaranteed Quality

Fat Erase's fast-acting properties make it easy to take right at mealtimes. With our busy lives today, we no longer have the time to remember to take a product an hour before we eat like other chitosan products. Fat Erase gives you the convenience to incorporate the positive benefits of chitosan into your regular weight management routine. When it comes to personal eating patters, we know that it can be extremely difficult to chage our individual habits. While experience tells us that we don't need another new diet that doesn't work, we do need help. Taking only 1-2 grams of Fat Erase per day in conjuction with a responsible diet and exercise program can be just the tool we need to have a realistic chance of taking control of our fat consumption -- and our weight.

A double-blind, placebo controlled study involving 59 overweight women taking 3 capsules of the active ingredient in Fat Erase before meals each day, showed a significant weight loss differential of 5 pounds over an 8 week period. This modified form of chitosan binds 3 to 5 times more fat than other varieties of chitosan. Due to its quick action, it can be taken at meal time for added convenience. Other generic chitosans need to be taken 30-60 minutes before meals.* Use with a sensible diet and exercise program.

Order by Phone 800-338-7979 24 hours Customer Service 800-754-8000

Information provided on this site is solely for informational purposes only. It is not a substitute for professional medical advice.

Binds to dietary fat

When it comes to dieting, we all know that we need to reduce not only our overall consumption of food, but also our total fat intake. We also know that if it tastes good, it has to be loaded with fat. So even if we eat less of the foods that we like, we are still consuming too much fat. Sometimes the hardest part of dieting is having to substitute lowfat or fat-free foods that have less flavor for the ones we love. Now you don't have to suffer through a bland diet or lose momentum on your weight loss plan due to one little slip up. With Fat Erase, you can indulge occassionally in your favorite fatty foods and literally erase its detrimental effect on your weight.

Reduce Calories Absorbed From Dietary Fat* Fat Erase binds with dietary fat from your favorite foods, reducing calories from being absorbed by the body.

Precautions

Make sure you carefully read all product labeling and packaging prior to use. If you have or suspect you may have a health problem, do not take any supplements without first consulting and obtaining the approval of your healthcare provider. California Consumers – Proposition 65 requires sellers to notify California consumers of substances that are in many foods, plants, herbs and supplements with the following warning. WARNING: These products contain chemicals known to the State of California to cause birth defects or other reproductive harm.

Keep out of reach of children.

California Residents Proposition 65 WARNING: This product contains substances known to the State of California to cause birth defects or other reproductive harm.

Do not take if you are pregnant or lactating.

Contains shrimp shells.

Do not use this information for diagnosing or treating a health problem or disease, or prescribing of any medications or supplements. Only your healthcare provider should diagnose your healthcare problems and prescribe treatment.

Please consult your healthcare provider before starting any supplement, diet or exercise program, before taking any medications or receiving treatment, particularly if you are currently under medical care.

Brand IP Statement(s)

2000-2015 Nutrition Express Corporation. All rights reserved.

Miscellaneous Liposan Ultra is a trademark of Primex ehf.

Nutrition Express Low prices on America's best supplements

Suggested/Recommended/Usage/Directions

Directions For Use Take 3 capsules with at least 8 ounces of water or liquid immediately prior to the two largest meals of the day. Fat-soluble vitamins A, D, E, K, essential fatty acids or medications should be taken several hours before or after using this product.

Storage

Storage Store in a cool, dry place.

FDA Disclaimer Statement

Warnings *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

None of our statements or information, including health claims, articles, advertising or product information have been evaluated or approved by the United States Food and Drug Administration (FDA). The products or ingredients referred to on this site are not intended to diagnose, treat, cure or prevent any disease.

Formula

Contains shrimp shells.

Fat Erase Diet Chitosan 500 Mg

LipoSan Ultra

Fat Erase is made of chitosan, a dietary fiber that binds fats and oils and naturally eliminates them from the body -- as if you had never eaten them. The basic raw material to make chitosan is chitin, the animal kingdom's version of plant cellulose, extracted from the shells of shrimp, crabs and lobster.

It features LipoSan Ultra chitosan, the same ingredient shown to be effective in clinical studies.

General

Item No. 94-275

FDA Statement of Identity

Dietary Supplement

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Fat Erase by Fitness Labs label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Fat Erase label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Fat Erase by Fitness Labs

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size3 Capsule(s) Dosage formCapsule Servings per container40 Amounts shown are per serving.

LipoSan Ultra Chitosan

Interacts with
3 drugs
1.5 Gram(s) per serving

Chitosan is a fiber-like substance made from the shells of shrimp, crabs, and other shellfish, often marketed for weight loss and cholesterol. The evi...

LipoSan Ultra Chitosan monograph & interactions

Other (inactive) ingredients: Gelatin, Succinic Acid, Rice powder. These complete the product’s ingredient list but are not active constituents.

Interaction report

Fat Erase by Fitness Labs Drug Interactions

Want to check YOUR meds against Fat Erase?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
3Drugs
3 Moderate

Ingredients driving the most interactions

LipoSan Ultra Chitosan 3

Individual Drug Interactions

The ingredients in Fat Erase interact with 3 drugs. Click any drug to see the details.

1 of the 1 ingredient in Fat Erase interact with drugs. Each result below shows which ingredient is responsible. LipoSan Ultra Chitosan

Each ingredient & the kinds of drugs it affects

For each ingredient in Fat Erase with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

LipoSan Ultra Chitosan2 drug types · 3 drugs

Acyclovir (Zovirax)

Chitosan can reduce the absorption of acyclovir, potentially increasing the risk for treatment failure.
Clinical research in humans shows that taking chitosan along with acyclovir 200 mg reduces acyclovir absorption. Concomitant administration of chitosan 400 mg or 1000 mg reduced the acyclovir area under the curve (AUC) and peak plasma concentration by about 30% and 40%, respectively, compared with control. Concomitant administration with chitosan 1000 mg also increased time to peak concentration from 1 hour to 2 hours. In vitro research suggests that the mechanism for reduced absorption is due to acyclovir entrapment in chitosan-mucus complexes, which reduces intestinal absorption.

Likelihood Possible Evidence B
Warfarin (Coumadin)

Theoretically, chitosan might increase the risk of bleeding when taken with warfarin.
In a case report, a patient taking warfarin had a significantly increased international normalized ratio (INR) after starting chitosan 1200 mg daily. The INR normalized after chitosan was discontinued and vitamin K was administered. The patient once again started taking chitosan and again had a significant increase in INR. The INR stabilized again once chitosan was discontinued. Researchers theorize that this interaction might occur because chitosan decreases absorption of fat-soluble vitamins, including vitamin K, which could increase the anticoagulant effect of warfarin.

Likelihood Possible Evidence D
LipoSan Ultra Chitosan full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Fat Erase, from the product label.

Fitness Labs

See all Fitness Labs products
Name
Nutrition Express
Phone Number
1-800-338-7979
Pharmacist Counseling Corner

Fat Erase by Fitness Labs: Common Questions

Does Fat Erase by Fitness Labs interact with any medications?
Yes. Based on its ingredients, Fat Erase has a known interaction with 3 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Fat Erase contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Is chitosan safe for people with shellfish allergies?
No. Chitosan is derived from shellfish shells, so anyone with a shellfish allergy should avoid it. Let your doctor or pharmacist know about any shellfish sensitivity before taking this product.
Can I take Fat Erase while I'm pregnant or breastfeeding?
The safety data isn't sufficient for either pregnancy or breastfeeding, and the facts advise against use in both cases. Talk with your doctor or pharmacist about your specific situation and whether this product is appropriate for you.
What stomach side effects should I expect?
The most common ones are constipation, diarrhea, gas, stomach discomfort, and nausea. Some people also report excess fat in their stools (steatorrhea). These typically happen short-term, but everyone's different.
Does Fat Erase actually help with weight loss?
For obesity, the evidence is 'possibly effective'—meaning there's some research support, but the quality is limited. It's not a proven slam-dunk. Results vary, and it works best alongside diet and exercise.
Will chitosan interfere with my warfarin?
Yes. Chitosan may increase your bleeding risk on warfarin, and at least one patient had a dangerous rise in clotting time after starting it. If you take warfarin, check with your own doctor or pharmacist before taking Fat Erase.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Fat Erase label
Go deeper

The Full Monographs Behind Fat Erase’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Chitosan

Interacts with 3 drugs

Chitosan is a fiber-like substance made from the shells of shrimp, crabs, and other shellfish, often marketed for weight loss and cholesterol. The evidence for these benefits is weak, and an...

Read the full Chitosan monograph →
Sources

Sources & How We Checked

Fat Erase's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 17 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Chitosan 17 references
  1. Jing SB, Li L, Ji D, et al. Effect of chitosan on renal function in patients with chronic renal failure. J Pharm Pharmacol 1997;49:721-3. PubMed
  2. Pittler MH, Abbot NC, Harkness EF, Ernst E. Randomized, double-blind trial of chitosan for body weight reduction. Eur J Clin Nutr 1999;53:379-81. PubMed
  3. Ho SC, Tai ES, Eng PH, et al. In the absence of dietary surveillance, chitosan does not reduce plasma lipids or obesity in hypercholesterolaemic obese Asian subjects. Singapore Med J 2001;42:6-10.
  4. Bokura H, Kobayashi S. Chitosan decreases total cholesterol in women: a randomized, double-blind, placebo-controlled trial. Eur J Clin Nutr 2003;57:721-5. PubMed
  5. Mhurchu CN, Poppitt SD, McGill AT, et al. The effect of the dietary supplement, Chitosan, on body weight: a randomised controlled trial in 250 overweight and obese adults. Int J Obes Relat Metab Disord 2004;28:1149-56. PubMed
  6. Huang SS, Sung SH, Chiang CE. Chitosan potentiation of warfarin effect. Ann Pharmacother 2007;41:1912-4. PubMed
  7. Tsai, G. J. and Su, W. H. Antibacterial activity of shrimp chitosan against Escherichia coli. J Food Prot. 1999;62(3):239-243. PubMed
  8. Wuolijoki, E., Hirvela, T., and Ylitalo, P. Decrease in serum LDL cholesterol with microcrystalline chitosan. Methods Find.Exp Clin Pharmacol. 1999;21(5):357-361. PubMed
  9. Nelson, J. L., Alexander, J. W., Gianotti, L., Chalk, C. L., and Pyles, T. Influence of dietary fiber on microbial growth in vitro and bacterial translocation after burn injury in mice. Nutrition 1994;10(1):32-36.
  10. Schiller RN, Barrager E, Schauss EA, and et al. A randomized, double-blind, placebo-controlled study examining the effects of a rapidly soluble chitosan dietary supplement on weight loss and body composition in overweight and mildly obese individuals. J
  11. Koide, S. S. Chitin-chitosan: properties, benefits and risks. Nutrition Research 1998;8(6):1091-1101. DOI
  12. Maezaki Y, Tsuji K, Nakawa, and et al. Hypocholesterolaemic effect of chitosan in adult males. Biosc Biochem Biotech 1993;57:1439-1444.
  13. Kubbinga M, Nguyen MA, Staubach P, et al. The influence of chitosan on the oral bioavailability of acyclovir-a comparative bioavailability study in humans. Pharm Res 2015;32(7):2241-9. PubMed
  14. Jull AB, Ni Mhurchu C, Bennett DA, et al. Chitosan for overweight or obesity. Cochrane Database Syst Rev 2008;(3):CD003892. PubMed
  15. Schmidl D, Werkmeister R, Kaya S, et al. A Controlled, Randomized Double-Blind Study to Evaluate the Safety and Efficacy of Chitosan-N-Acetylcysteine for the Treatment of Dry Eye Syndrome. J Ocul Pharmacol Ther. 2017;33(5):375-382.
  16. Moraru C, Mincea MM, Frandes M, Timar B, Ostafe V. A meta-analysis on randomised controlled clinical trials evaluating the effect of the dietary supplement chitosan on weight loss, lipid parameters and blood pressure. Medicina (Kaunas). 2018;54(6):109. PubMed
  17. García MA, Hensler G, Al-Gousous J, Pielenhofer J, Wagner M, Lennernäs H, Langguth P. Novel food drug interaction mechanism involving acyclovir, chitosan and endogenous mucus. Drug Metab Pharmacokinet. 2023;49:100491. PubMed

See these in context on the Chitosan monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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