💡 What You Need to Know Right Away
- Modest but measurable weight loss: L-Carnitine supplementation produces an average weight loss of 1.21 kg according to a meta-analysis of 37 randomized controlled trials.[Evidence: A][1]
- Optimal dose identified: Research shows maximum weight loss effect at 2000 mg per day, with a non-linear dose-response relationship.[Evidence: A][1]
- Works best with lifestyle changes: Effects are most pronounced in overweight and obese individuals who combine supplementation with diet and exercise.[Evidence: A][3]
- Strong safety profile: L-Carnitine supplementation up to 2000 mg daily is safe with minimal side effects in healthy adults.[Evidence: A][6]
If you've been researching weight loss supplements, you've likely encountered L-Carnitine. With countless products claiming dramatic results, it's natural to feel skeptical—and you should be. The weight loss supplement industry is full of overpromises and underdelivered results.
Here's what makes L-Carnitine different: it's one of the most studied supplements for weight management, with over 37 randomized controlled trials examining its effects. The results? They're modest but real. This isn't a magic pill, and we won't pretend it is.
In this comprehensive guide, we'll walk you through exactly what the research shows—and doesn't show—about L-Carnitine for weight loss. You'll learn the optimal dosage, when to take it, who benefits most, and the safety considerations you need to know. By the end, you'll have the evidence-based information needed to make an informed decision with your healthcare provider.
❓ Quick Answers
What is L-Carnitine?
L-Carnitine is an amino acid derivative that plays a fundamental role in energy production by transporting long-chain fatty acids into mitochondria where they are burned for fuel. Your body naturally produces L-Carnitine from lysine and methionine, and it's also found in foods like red meat. As a supplement, it's commonly used to support weight loss and metabolic health.[Evidence: D][13]
How does L-Carnitine work for weight loss?
L-Carnitine acts as a transport molecule, shuttling fatty acids into mitochondria for beta-oxidation (fat burning). It also buffers acyl-CoA and acetyl-CoA ratios, preventing metabolic inflexibility and lipotoxicity. This mechanism supports the body's ability to use fat for energy rather than storing it.[Evidence: D][13]
What foods are high in L-Carnitine?
Red meat is the richest dietary source, with beef steak providing approximately 56-162 mg per 3-ounce serving. Other sources include pork (24 mg), fish (5 mg), chicken breast (3-5 mg), and dairy products like whole milk (8 mg per cup). Plant foods contain minimal amounts, making vegetarians and vegans more likely to benefit from supplementation.
Does L-Carnitine help with weight loss?
Yes, but modestly. A meta-analysis of 37 randomized controlled trials found L-Carnitine supplementation significantly reduced body weight by an average of 1.21 kg, BMI by 0.24 kg/m², and fat mass by 2.08 kg. Effects are greater in overweight and obese individuals.[Evidence: A][1]
How much L-Carnitine should I take for weight loss?
Research indicates the optimal dose is 2000 mg per day, which showed maximum weight loss effect in dose-response analyses. Doses range from 500 mg to 3000 mg daily in clinical trials. Start with 500-1000 mg daily to assess tolerance, then increase to the optimal 2000 mg if well-tolerated.[Evidence: A][1]
Is L-Carnitine safe to take daily?
L-Carnitine supplementation up to 2000 mg daily has a strong safety profile with minimal side effects. At doses exceeding 3000 mg, some people experience nausea, stomach upset, or fishy body odor. Long-term high-dose use may elevate TMAO levels, which warrants monitoring.[Evidence: A][6]
How long does it take for L-Carnitine to work?
Clinical trials show measurable effects within 4-24 weeks of consistent supplementation. Type 2 diabetes patients may see metabolic improvements in as little as 2 weeks. Visible weight loss results typically appear after 8-12 weeks when combined with diet and exercise.[Evidence: A][4]
When is the best time to take L-Carnitine?
For exercise performance benefits, take 3-4 g approximately 60-90 minutes before high-intensity exercise. For general weight loss support, taking 2000 mg daily with meals helps absorption. Some research suggests taking L-Carnitine with carbohydrates enhances muscle uptake.[Evidence: A][7]
L-Carnitine & Metabolism
Unlock the science behind the "Shuttle" amino acid. Discover how L-Carnitine transforms stored fat into usable cellular energy to optimize your body composition.
🔬 How Does L-Carnitine Work for Weight Loss?
Understanding how L-Carnitine works helps explain why it produces modest—not miraculous—results. The science is fascinating, and once you grasp it, you'll understand both the potential and limitations of this supplement.
Think of L-Carnitine as a shuttle bus for fat. Your body stores energy in fat cells, but to actually use that fat for energy, it needs to be transported into your cells' power plants—the mitochondria. L-Carnitine is the vehicle that makes this transport possible. Without adequate L-Carnitine, fatty acids simply can't enter mitochondria efficiently, regardless of how much you exercise.[Evidence: D][13]
At the molecular level, L-Carnitine is essential for mitochondrial beta-oxidation—the process where fatty acids are broken down to produce ATP (cellular energy). It buffers the ratios of acyl-CoA and acetyl-CoA, preventing metabolic inflexibility and protecting cellular membranes from lipotoxicity (damage from excess fat accumulation).[Evidence: D][13]
Here's another helpful analogy: imagine your metabolism as a factory assembly line. L-Carnitine acts as the conveyor belt moving raw materials (fat) to the furnace (mitochondria) where they're burned for energy. If the conveyor belt slows down, raw materials pile up instead of being processed.
Beyond fat transport, L-Carnitine supports broader metabolic health. Research shows it decreases waist circumference and systolic blood pressure, while doses exceeding 1 g per day improve fasting glucose, triglycerides, and HDL cholesterol.[Evidence: A][9]
For exercise, L-Carnitine reduces muscle damage and speeds recovery. Studies demonstrate reduced muscle soreness at 24-48 hours post-exercise and decreased creatine kinase elevation—a marker of muscle damage. This allows for more consistent training, which indirectly supports weight loss goals.[Evidence: A][8]
In Type 2 diabetes patients, carnitine supplementation elevated skeletal muscle acetylcarnitine concentrations and improved insulin sensitivity markers, suggesting enhanced metabolic flexibility—the ability to switch between burning carbohydrates and fats efficiently.[Evidence: B][12]
📊 Dosage and How to Use L-Carnitine
Getting the dosage right is crucial for seeing results with L-Carnitine. Fortunately, we have robust clinical trial data to guide recommendations. The table below summarizes evidence-based dosing strategies for different goals.
| Purpose/Goal | Dosage | Duration | Evidence |
|---|---|---|---|
| Weight loss (optimal) | 2000 mg/day | 4-24 weeks | [A][1] |
| Weight loss (Type 2 Diabetes) | 1500-3000 mg/day | 8-24 weeks | [A][4] |
| High-intensity exercise performance | 3000-4000 mg (single dose) | 60-90 min before exercise | [A][7] |
| Exercise recovery | 2000 mg/day | 5 weeks | [B][11] |
| Metabolic syndrome support | 750-3000 mg/day | 8-24 weeks | [A][9] |
Key Dosing Principles
Start low, increase gradually: Begin with 500-1000 mg daily for the first week to assess tolerance. If well-tolerated, increase to the optimal 2000 mg daily dose.
Non-linear dose-response: Research demonstrates that 2000 mg per day provides maximum weight loss benefit. Higher doses (3000+ mg) don't produce better results and may increase side effects.[Evidence: A][1]
Take with carbohydrates: L-Carnitine absorption into muscle tissue improves when taken with carbohydrates, which stimulate insulin release. Taking it with meals is practical and effective.
Split doses if needed: For doses above 2000 mg, consider splitting into two doses (morning and afternoon) to optimize absorption and minimize gastrointestinal discomfort.
Timing for exercise: For acute performance benefits, take 3-4 g approximately 60-90 minutes before high-intensity exercise. This timing allows blood levels to peak during your workout.[Evidence: A][7]
⚠️ Risks, Side Effects, and Warnings
L-Carnitine has a strong safety profile at recommended doses, but understanding potential risks helps you supplement responsibly. Here's what the research tells us.
Side Effects by Frequency
Common (reported in some studies): Nausea, stomach upset, and fishy body odor at higher doses (above 3000 mg/day). These effects are generally mild and dose-dependent.[Evidence: A][6]
Uncommon: Diarrhea and vomiting, typically at high doses. Reducing the dose or taking with food usually resolves these symptoms.
Rare/Theoretical: The systematic review noted elevated fasting plasma TMAO (trimethylamine N-oxide) levels without affecting inflammatory markers. TMAO elevation is an emerging cardiovascular concern that warrants monitoring with long-term high-dose supplementation.[Evidence: A][6]
Drug Interactions
Limited interaction data exists in 2015+ literature. Potential interactions to discuss with your healthcare provider include:
- Oral anticoagulants (acenocoumarol): Potential interaction reported; monitor INR if taking blood thinners
- Thyroid medications: May affect thyroid hormone levels in some individuals
- Fluoroquinolone antibiotics: May inhibit L-Carnitine absorption
Contraindications
Absolute contraindications: None established in 2015+ literature at standard supplementation doses.
Relative contraindications requiring medical supervision:
- History of seizure disorders (limited data)
- End-stage renal disease
- Pregnancy and breastfeeding (limited safety data in 2015+ sources)
Special Population Considerations
Type 2 Diabetes: Safe with improved metabolic markers. Research shows greater weight loss benefits in this population.[Evidence: B][12]
NAFLD (Non-alcoholic fatty liver disease): Safe with improved liver function markers (AST, ALT) and no significant adverse effects in clinical trials.[Evidence: A][10]
Athletes: Safe with enhanced recovery and reduced muscle damage markers.[Evidence: A][8]
⚠️ Important Safety Information
- Do not exceed 3000 mg daily without medical supervision
- Consult your healthcare provider before use if you are pregnant, breastfeeding, or have kidney disease
- Long-term supplementation (>24 weeks) at high doses may elevate TMAO levels—discuss cardiovascular monitoring with your doctor[6]
- Stop use and consult a doctor if you experience persistent nausea, vomiting, or unusual symptoms
🥗 Practical Ways to Use L-Carnitine
How to Use This in Your Daily Life
Scenario 1: General Weight Loss Support
- Dose: 2000 mg/day[1]
- Duration: 8-24 weeks minimum[1]
- Population: Overweight and obese adults
- Timing: With meals (breakfast and/or lunch)
- What to track: Body weight, waist circumference weekly
- Expected results: Average 1.21 kg weight loss, 2.08 kg fat mass reduction[1]
Scenario 2: Exercise Enhancement and Recovery
- Dose: 2000 mg/day (chronic) or 3-4 g pre-workout (acute)[7][11]
- Duration: 5+ weeks for recovery benefits[11]
- Population: Active adults, athletes
- Timing: 60-90 minutes before high-intensity exercise for acute benefits[7]
- What to track: Perceived soreness, workout performance, recovery time
- Expected results: Reduced muscle soreness at 24-48 hours, improved perceived recovery[8]
Scenario 3: Type 2 Diabetes Metabolic Support
- Dose: 1500-3000 mg/day (optimal around 2000 mg)[4]
- Duration: 8-24 weeks[4]
- Population: Adults with Type 2 diabetes (with physician approval)
- Timing: With meals
- What to track: Blood glucose, HbA1c, weight, waist circumference
- Expected results: BMI reduction of 0.37 kg/m² per gram daily, HbA1c reduction of 0.16% per gram daily[4]
Practical Integration
Take L-Carnitine capsules or liquid with your morning meal. Liquid forms may absorb slightly faster but capsules are equally effective. Store in a cool, dry place away from direct sunlight. Refrigerate liquid forms after opening.
Common Mistakes to Avoid
- Taking without lifestyle changes: Research shows L-Carnitine works best when combined with diet and exercise modifications—supplements alone produce smaller effects.[3]
- Exceeding optimal dose: More is not better. The 2000 mg/day dose shows maximum effect; higher doses don't improve results.[1]
- Inconsistent use: Clinical trials showing benefits used daily supplementation for 4-24 weeks. Sporadic use is unlikely to produce measurable results.
- Expecting rapid results: Visible weight loss typically requires 8-12 weeks of consistent supplementation combined with healthy habits.
⚖️ L-Carnitine vs. Acetyl-L-Carnitine: Which Is Better for Weight Loss?
L-Carnitine comes in several forms, and choosing the right one depends on your primary goals. The two most common forms are L-Carnitine (or L-Carnitine Tartrate) and Acetyl-L-Carnitine (ALCAR). Here's how they compare.
| Feature | L-Carnitine / L-Carnitine Tartrate | Acetyl-L-Carnitine (ALCAR) |
|---|---|---|
| Primary use | Weight loss, exercise performance, fat metabolism | Cognitive function, neuroprotection, brain health |
| Blood-brain barrier | Does not cross efficiently | Crosses blood-brain barrier |
| Best for weight loss | Yes - most studied form for body composition | Limited weight loss data |
| Exercise recovery | Yes - reduces muscle soreness and CK elevation[8] | Less studied for exercise |
| Typical dosage | 2000 mg/day[1] | 500-2000 mg/day |
| Cost (typical) | $15-30/month | $20-40/month |
Bottom line for weight loss: Standard L-Carnitine or L-Carnitine Tartrate is the better choice if your primary goal is weight management and exercise performance. The meta-analyses demonstrating weight loss benefits primarily used these forms.[Evidence: A][1]
Acetyl-L-Carnitine may be preferable if you want both metabolic support and cognitive benefits, as it can cross the blood-brain barrier. Some people combine both forms, but this is not necessary for weight loss goals.
What The Evidence Shows (And Doesn't Show)
What Research Suggests
- L-Carnitine supplementation produces statistically significant but modest weight loss—an average of 1.21 kg body weight reduction across 37 randomized controlled trials (n=2,292 participants).[Evidence: A][1]
- Fat mass reduction averages 2.08 kg, with BMI decreasing by 0.24 kg/m², based on Level A meta-analysis evidence.[Evidence: A][1]
- Optimal dose is 2000 mg per day—a non-linear dose-response relationship means higher doses don't produce better results.[Evidence: A][1]
- Effects are most pronounced in overweight and obese individuals who combine supplementation with lifestyle modifications.[Evidence: A][3]
- Type 2 diabetes patients show enhanced benefits: every 1 g/day reduced BMI by 0.37 kg/m² and HbA1c by 0.16%.[Evidence: A][4]
- An umbrella meta-analysis of 8 prior meta-analyses (16,352 total participants) confirms consistent weight loss effects across multiple independent analyses.[Evidence: A][5]
What's NOT Yet Proven
- Long-term efficacy beyond 24 weeks: Most trials lasted 4-24 weeks. Whether effects persist or diminish with longer use requires more research. One meta-analysis noted effects may diminish with prolonged use.[2]
- Spot reduction of belly fat: L-Carnitine reduces overall body fat and waist circumference but cannot selectively target abdominal fat.
- Efficacy in normal-weight individuals: Benefits are demonstrated primarily in overweight and obese populations. Normal-weight individuals may see minimal effects.
- Safety beyond 2000 mg long-term: While short-term high doses appear safe, long-term TMAO elevation concerns require monitoring.
- Pregnancy and lactation safety: Insufficient data in 2015+ clinical literature to establish safety in these populations.
Where Caution Is Needed
- TMAO elevation: Systematic review found elevated fasting plasma TMAO levels with L-Carnitine supplementation. TMAO is a potential pro-atherogenic marker—discuss cardiovascular monitoring with your doctor if using long-term.[Evidence: A][6]
- Diminishing returns over time: One meta-analysis found effects may decrease with prolonged supplementation, suggesting periodic cycling may be appropriate.[Evidence: A][2]
- Realistic expectations: Average weight loss of 1.21 kg is modest. L-Carnitine is a supportive adjunct, not a primary weight loss solution.
- Quality variability: Supplement quality varies by manufacturer. Choose products with third-party testing (NSF, USP certification) when possible.
Should YOU Try This?
Best suited for: Overweight or obese adults (BMI ≥25) committed to diet and exercise modifications; Type 2 diabetes patients (with physician approval) seeking metabolic support; athletes wanting enhanced exercise recovery and reduced muscle soreness.
Not recommended for: Individuals allergic to L-Carnitine or carnitine derivatives; those with end-stage kidney disease without medical supervision; pregnant or breastfeeding women (insufficient safety data); anyone seeking dramatic, rapid weight loss (set realistic expectations).
Realistic timeline: Allow 8-12 weeks of consistent supplementation combined with lifestyle changes before evaluating results. Metabolic improvements may appear earlier (2-4 weeks in some populations), but visible body composition changes take longer.
When to consult a professional: Before starting supplementation if you have any chronic health condition, take prescription medications (especially blood thinners, diabetes medications, or thyroid medications), or are over age 65. Discuss cardiovascular monitoring if planning long-term supplementation above 2000 mg daily.
Frequently Asked Questions
What are the side effects of L-Carnitine?
L-Carnitine is generally well-tolerated at doses up to 2000 mg daily. At higher doses (above 3000 mg), some people experience nausea, stomach upset, diarrhea, or a fishy body odor from trimethylamine production. A systematic review found supplementation may elevate fasting plasma TMAO levels, which is an emerging cardiovascular concern requiring further research. Serious side effects are rare at standard supplementation doses. If you experience persistent gastrointestinal symptoms, reduce your dose or take with food.
What is the difference between L-Carnitine and Acetyl-L-Carnitine?
L-Carnitine and Acetyl-L-Carnitine (ALCAR) are structurally similar but have different primary applications. Standard L-Carnitine is better studied for weight loss and exercise performance—the 37-trial meta-analysis showing 1.21 kg weight loss used L-Carnitine forms. Acetyl-L-Carnitine has an acetyl group that allows it to cross the blood-brain barrier, making it better suited for cognitive support and neuroprotection. For pure weight loss goals, L-Carnitine or L-Carnitine Tartrate is the recommended choice based on available evidence.
Can you take L-Carnitine without exercising?
Yes, L-Carnitine shows weight loss effects even without exercise, but results are significantly better when combined with physical activity. The meta-analysis found beneficial effects primarily in overweight and obese subjects who combined supplementation with lifestyle modifications including exercise. L-Carnitine enhances fat transport to mitochondria, but exercise increases the demand for this energy—creating a synergistic effect. If exercise isn't possible, you may still see modest benefits, but managing expectations is important.
Does L-Carnitine burn belly fat specifically?
L-Carnitine does not selectively target belly fat. No supplement can 'spot reduce' fat from specific areas—this is a physiological impossibility. However, L-Carnitine does reduce overall fat mass (average 2.08 kg in meta-analysis) and waist circumference, which means abdominal fat loss occurs as part of overall body fat reduction. Research on metabolic syndrome biomarkers showed L-Carnitine significantly decreased waist circumference. For best results, combine supplementation with a caloric deficit and exercise program.
Is L-Carnitine injection better than oral supplements?
Injectable L-Carnitine offers higher bioavailability (near-complete absorption) compared to oral supplements (approximately 14-18% bioavailability for standard doses). However, most clinical trials demonstrating weight loss benefits used oral supplementation at 2000 mg daily—proving oral forms are effective despite lower absorption. The cost is significantly higher ($50-150+ per month vs. $15-30 for oral), and administration requires injection training or clinic visits. For most people seeking weight loss support, oral supplementation is practical and evidence-based.
Can I take L-Carnitine with other supplements?
L-Carnitine can generally be combined safely with common supplements including protein powder, creatine, and caffeine. Taking L-Carnitine with carbohydrates may enhance muscle uptake by stimulating insulin release. There are no documented negative interactions with standard fitness supplements. However, if you're taking medications—particularly blood thinners, thyroid medications, or diabetes drugs—consult your healthcare provider before adding L-Carnitine, as interactions may require monitoring or dose adjustments.
Who should not take L-Carnitine?
While L-Carnitine has a strong safety profile, certain populations should exercise caution or avoid supplementation. Those with end-stage kidney disease should only use L-Carnitine under medical supervision. People with seizure disorders have limited safety data available. Pregnant and breastfeeding women lack sufficient 2015+ safety data for these populations. Anyone taking oral anticoagulants should discuss potential interactions with their doctor. If you have any chronic health condition, consult your healthcare provider before starting supplementation.
Can L-Carnitine interact with my medications?
Limited interaction data exists in recent clinical literature. Documented or theoretical interactions include: oral anticoagulants (acenocoumarol) where INR monitoring may be needed; thyroid medications where L-Carnitine may affect hormone levels; and fluoroquinolone antibiotics which may reduce L-Carnitine absorption. For diabetes medications, L-Carnitine may improve insulin sensitivity, potentially requiring dose adjustments. Always inform your healthcare provider about all supplements you're taking, especially if you're on prescription medications for chronic conditions.
Our Accuracy Commitment and Editorial Principles
At Biochron, we take health information seriously. Every claim in this article is supported by peer-reviewed scientific evidence from reputable sources published in 2015 or later. We use a rigorous evidence-grading system to help you understand the strength of research behind each statement:
- [Evidence: A] = Systematic review or meta-analysis (strongest evidence)
- [Evidence: B] = Randomized controlled trial (RCT)
- [Evidence: C] = Cohort or case-control study
- [Evidence: D] = Expert opinion or clinical guideline
Our editorial team follows strict guidelines: we never exaggerate health claims, we clearly distinguish between correlation and causation, we update content regularly as new research emerges, and we transparently note when evidence is limited or conflicting. For our complete editorial standards, visit our Editorial Principles page.
This article is for informational purposes only and does not constitute medical advice. Always consult qualified healthcare professionals before making changes to your health regimen, especially if you have medical conditions or take medications.
References
- 1 . Effects of l-carnitine supplementation on weight loss and body composition: A systematic review and meta-analysis of 37 randomized controlled clinical trials with dose-response analysis, Clinical Nutrition ESPEN, 2020, PubMed | DOI [Evidence: A]
- 2 . The effect of (L-)carnitine on weight loss in adults: a systematic review and meta-analysis of randomized controlled trials, Obesity Reviews, 2016, PubMed | DOI [Evidence: A]
- 3 . Beneficial effects of l-carnitine supplementation for weight management in overweight and obese adults: An updated systematic review and dose-response meta-analysis of randomized controlled trials, Pharmacological Research, 2020, PubMed | DOI [Evidence: A]
- 4 . The Effects of L-Carnitine Supplementation on Weight Loss, Glycemic Control, and Cardiovascular Risk Factors in Patients With Type 2 Diabetes: A Systematic Review and Dose-response Meta-Analysis of Randomized Controlled Trials, Clinical Therapeutics, 2024, PubMed | DOI [Evidence: A]
- 5 . The Effect of the L-Carnitine Supplementation on Obesity Indices: An Umbrella Meta-Analysis, International Journal for Vitamin and Nutrition Research, 2025, PubMed | DOI [Evidence: A]
- 6 . The bright and the dark sides of L-carnitine supplementation: a systematic review, Journal of the International Society of Sports Nutrition, 2020, PubMed | DOI [Evidence: A]
- 7 . Effect of Acute and Chronic Oral l-Carnitine Supplementation on Exercise Performance Based on the Exercise Intensity: A Systematic Review, Nutrients, 2021, PubMed | DOI [Evidence: A]
- 8 . The Effect of L-Carnitine Supplementation on Exercise-Induced Muscle Damage: A Systematic Review and Meta-Analysis of Randomized Clinical Trials, Journal of the American College of Nutrition, 2020, PubMed | DOI [Evidence: A]
- 9 . L-Carnitine's Effect on the Biomarkers of Metabolic Syndrome: A Systematic Review and Meta-Analysis of Randomized Controlled Trials, Nutrients, 2020, PubMed | DOI [Evidence: A]
- 10 . Efficacy and safety of carnitine supplementation on NAFLD: a systematic review and meta-analysis, Systematic Reviews, 2023, PubMed | DOI [Evidence: A]
- 11 . L-Carnitine Tartrate Supplementation for 5 Weeks Improves Exercise Recovery in Men and Women: A Randomized, Double-Blind, Placebo-Controlled Trial, Nutrients, 2021, PubMed | DOI [Evidence: B]
- 12 . Carnitine supplementation improves insulin sensitivity and skeletal muscle acetylcarnitine formation in patients with type 2 diabetes, Diabetes, Obesity and Metabolism, 2025, PubMed | DOI [Evidence: B]
- 13 . The Role of l-Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation, International Journal of Molecular Sciences, 2022, PubMed | DOI [Evidence: D]
Medical Disclaimer
This content is for informational and educational purposes only. It is not intended to provide medical advice or to take the place of such advice or treatment from a personal physician. All readers are advised to consult their doctors or qualified health professionals regarding specific health questions and before making any changes to their health routine, including starting new supplements.
Neither Biochron nor the author takes responsibility for possible health consequences of any person reading or following the information in this educational content. All readers, especially those taking prescription medications, should consult their physicians before beginning any nutrition, supplement, or lifestyle program.
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