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Fat Burners: Your Go-To Guide

by Ultimate Sup Staff on November 01, 2023

If you are looking for a way to lose weight faster and easier, you might have heard of fat burners. These are supplements that claim to help you burn more fat, suppress your appetite, boost your metabolism, and enhance your energy levels. But do they really work? And are they safe to use? 

In this article, we will answer these questions and more. We will explain what fat burners are, what ingredients they contain, how they work, what benefits they offer, what side effects they may cause, and what natural alternatives you can try. We will also review some of the best fat burners available in Singapore and answer some frequently asked questions. By the end of this article, you will have a better understanding of fat burners and how to use them effectively.


  • Definition: Supplements with natural or synthetic elements aiming to promote fat burning, appetite reduction, metabolism boost, and energy enhancement.
  • Common Ingredients: Caffeine, green tea extract, carnitine, yohimbine, soluble fiber, etc.
  • Function: Stimulates the nervous system, enhances thermogenesis, limits fat absorption, boosts fat oxidation, and adjusts hormones.
  • Potential Benefits: Augmented calorie burn, appetite suppression, metabolic boost, elevated energy, and better athletic prowess.
  • Possible Side Effects: Anxiety, sleeplessness, heightened blood pressure, headaches, digestive disturbances, etc.
  • Usage Reminder: Not a standalone solution for weight loss; best combined with a balanced diet and exercise. Consultation and medical oversight advised.

What are Fat Burners?

Fat burners are dietary supplements with compounds designed to enhance fat burning. They can be natural or synthetic. Commonly referred to as thermogenics or weight loss pills, they come in capsules or tablets. Typically consumed before meals or workouts, their claims include boosting metabolism, appetite suppression, energy enhancement, and athletic performance improvement.

Common Ingredients in Fat Burners

There are dozens of ingredients that can be found in fat burner supplements. Some of the most common ones are:


Caffeine is a stimulant that affects the central nervous system. It can increase your alertness, mood, focus, and energy levels. It can also increase your metabolic rate and thermogenesis (the process of generating heat from burning calories). Caffeine can also stimulate the breakdown of fat cells and release fatty acids into the bloodstream for use as fuel. Caffeine is one of the most widely used ingredients in fat burner supplements because of its proven effects on fat burning and performance enhancement.

Green Tea Extract

Green tea extract is derived from the leaves of the Camellia sinensis plant. It contains antioxidants called catechins that have various health benefits. One of the most important catechins is epigallocatechin gallate (EGCG), which can boost your metabolism and thermogenesis by inhibiting an enzyme that breaks down norepinephrine (a hormone that stimulates fat burning). Green tea extract can also reduce the absorption of fat from food by interfering with digestive enzymes. Green tea extract is another popular ingredient in fat burner supplements because of its ability to increase fat oxidation and energy expenditure.


Carnitine is a compound that helps transport fatty acids into the mitochondria (the powerhouses of the cells) where they can be burned for energy. Carnitine is naturally produced by the body and can also be obtained from food sources such as meat and dairy products. Carnitine supplementation may enhance fat burning by increasing the availability of fatty acids for oxidation. Carnitine may also improve exercise performance by reducing muscle fatigue and increasing oxygen uptake.


Yohimbine is a compound extracted from the bark of an evergreen tree native to Africa. It acts as an alpha-2 adrenergic receptor antagonist, which means it blocks the receptors that inhibit lipolysis (the breakdown of fat cells). By doing so, yohimbine can increase the release of fatty acids into the bloodstream for use as fuel. Yohimbine may also suppress appetite by increasing norepinephrine levels in the brain. Yohimbine is often used in fat burner supplements because of its potential to enhance fat loss, especially in stubborn areas such as the abdomen and thighs.

Soluble Fiber

Soluble fiber is a type of dietary fiber that dissolves in water and forms a gel-like substance in the stomach. It can slow down the digestion and absorption of carbohydrates and fats, which can reduce the rise of blood sugar and insulin levels after a meal. Soluble fiber can also increase the feeling of fullness and satiety by stimulating the release of hormones that regulate appetite. Soluble fiber can help with weight loss by reducing calorie intake and improving blood sugar control. Some examples of soluble fiber include psyllium, glucomannan, inulin, and beta-glucans.

Other Ingredients

There are many other ingredients that can be found in fat burner supplements, such as capsaicin, piperine, forskolin, garcinia cambogia, raspberry ketones, and more. These ingredients may have some effects on fat burning, appetite suppression, metabolism enhancement, or energy production. However, the evidence for their effectiveness and safety is limited or inconclusive. Therefore, it is advisable to do your own research and consult your doctor before taking any fat burner supplements that contain these ingredients.

How do Fat Burners Work?

Fat burners influence how your body processes fat by:

  • Activating the Nervous System: Ingredients like caffeine and yohimbine trigger the fight-or-flight response, increasing hormones like adrenaline. This promotes the breakdown of fat and makes fatty acids available for energy.
  • Boosting Thermogenesis: Ingredients such as caffeine and green tea extract enhance calorie burning by raising body heat. This can elevate both resting and active calorie burn rates.
  • Reducing Fat Absorption: Components like green tea extract and soluble fiber can disrupt fat digestion, leading to fewer calories and fat being absorbed into your system.
  • Promoting Fat Burning: Ingredients like carnitine and green tea extract support the use of fat as an energy source, accelerating fat burn.
  • Regulating Hormones: Some ingredients can influence hormones tied to appetite and metabolism, impacting food consumption, energy levels, and weight.

Benefits of Using Fat Burners

Fat burners are designed to boost your metabolism, which is the rate at which your body burns calories. By increasing your metabolism, fat burners can help you burn more calories throughout the day, even when you are at rest. This can lead to a greater calorie deficit, which is essential for weight loss.

Some of the benefits of using fat burners are:

Increased calorie burning

Fat burners can help you burn more calories by stimulating thermogenesis, which is the process of generating heat in your body. Thermogenesis requires energy, which comes from burning calories. Some fat burners contain ingredients that can increase thermogenesis, such as caffeine, green tea extract, capsaicin, and forskolin.

Reduced appetite

Fat burners can help you reduce your appetite by affecting your hunger hormones, such as ghrelin and leptin. Ghrelin is the hormone that signals your brain that you are hungry, while leptin is the hormone that signals your brain that you are full. Some fat burners contain ingredients that can suppress ghrelin or increase leptin, such as glucomannan, garcinia cambogia, and chromium.

Improved metabolism

Fat burners can help you improve your metabolism by enhancing your fat oxidation, which is the process of breaking down fat molecules into smaller units that can be used for energy. Fat oxidation depends on several factors, such as your genetics, diet, exercise, and hormones. Some fat burners contain ingredients that can boost your fat oxidation, such as L-carnitine, conjugated linoleic acid (CLA), and raspberry ketones.

Enhanced energy levels

Fat burners can help you enhance your energy levels by providing you with stimulants, such as caffeine, guarana, and yerba mate. Stimulants can increase your alertness, focus, and motivation, which can help you perform better in your daily activities and workouts. 

Improved athletic performance

Fat burners can help you improve your athletic performance by improving your endurance, strength, power, and recovery. Some fat burners contain ingredients that can enhance your physical performance, such as beta-alanine, creatine, and nitric oxide boosters.

Potential Side Effects

Some of the potential side effects of using fat burners are:

  • Anxiety: Fat burners can cause nervousness, irritability, and mood swings by affecting your nervous system and hormones. Some fat burners contain stimulants like caffeine and ephedrine that can trigger the fight-or-flight response and disrupt the hunger signal to the brain. This can make you feel anxious and jittery.
  • Insomnia: Fat burners can also interfere with your sleep pattern by increasing your heart rate and metabolism. The stimulants in fat burners can keep you awake at night and prevent you from getting enough rest. Lack of sleep can cause fatigue, weakened immunity, and impaired cognitive function.
  • Increased blood pressure: Fat burners can raise your blood pressure by constricting your blood vessels and stimulating your heart. This can put extra strain on your cardiovascular system and increase the risk of heart attack, stroke, and other complications. People with high blood pressure or heart problems should avoid fat burners or consult their doctor before using them.
  • Headaches: Fat burners can cause headaches by dehydrating your body, altering your blood sugar levels, or triggering allergic reactions. Dehydration can also cause dizziness, nausea, and muscle cramps. You should drink plenty of water and eat a balanced diet when using fat burners to avoid these side effects.
  • Stomach upset: Fat burners can cause stomach problems like diarrhea, constipation, bloating, gas, or pain by affecting your digestion and metabolism. Some fat burners contain ingredients that can irritate your stomach lining or cause allergic reactions. You should take fat burners with food and avoid taking them on an empty stomach to minimize these side effects.

Natural Alternatives

If you are looking for natural ways to burn fat without taking supplements, you can try some of these alternatives:

  • Coffee
  • Coffee is one of the most popular beverages in the world and a natural source of caffeine. Caffeine can help you burn fat by increasing your thermogenesis, suppressing your appetite, improving your metabolism, and enhancing your energy levels. However, caffeine can also cause side effects, such as anxiety, insomnia, increased blood pressure, and headaches. Therefore, you should limit your coffee intake to no more than four cups per day and avoid drinking it late in the evening.

  • Green tea
  • Green tea is another popular beverage that can help you burn fat naturally. Green tea contains catechins, which are antioxidants that can boost your thermogenesis, reduce your appetite, improve your metabolism, and enhance your energy levels. Green tea also contains caffeine, but in lower amounts than coffee. Therefore, green tea may have fewer side effects than coffee. However, you should still be careful not to drink too much green tea or drink it on an empty stomach.

  • Protein
  • Protein is one of the most important macronutrients for your health and fitness. Protein can help you burn fat by increasing your thermogenesis, reducing your appetite, improving your metabolism, and enhancing your muscle mass. Protein can also help you improve your athletic performance by improving your endurance, strength, power, and recovery. You should aim to consume at least 0.8 grams of protein per kilogram of body weight per day and choose high-quality protein sources, such as lean meat, eggs, fish, dairy products, soy products, nuts, and seeds.

  • Fiber
  • Fiber is a type of carbohydrate that cannot be digested by your body. Fiber can help you burn fat by increasing your thermogenesis, reducing your appetite, improving your metabolism, and enhancing your gut health. Fiber can also help you lower your cholesterol levels and blood sugar levels. You should aim to consume at least 25 grams of fiber per day and choose high-fiber foods, such as fruits, vegetables, whole grains, beans, and legumes.

  • Spicy foods
  • Spicy foods are foods that contain capsaicin or other compounds that can make you feel hot or pungent. Spicy foods can help you burn fat by increasing your thermogenesis, reducing your appetite, improving your metabolism, and enhancing your energy levels. However, spicy foods can also cause side effects, such as stomach upset or heartburn. Therefore, you should eat spicy foods in moderation and avoid them if you have any digestive issues.

    How to Choose the Right Fat Burners

    If you are considering taking fat burner supplements, it is important to choose them carefully and take them safely. Here are a few tips:

    Choose Carefully:

    • Safe Ingredients: Caffeine, green tea extract, capsaicin, CLA, and L-carnitine are commonly found and supported for boosting energy, thermogenesis, and fat oxidation.
    • Avoid Harmful Substances: Stay away from ephedra, sibutramine, or clenbuterol. They're linked to severe side effects like high blood pressure and even death.

    Dose Gradually: Begin with a minimal amount. Depending on weight, sensitivity, and tolerance, effects vary. If you don’t see adverse reactions, consider increasing, but don’t go beyond the recommended dose. Excessive doses can lead to side effects.

    Health Considerations:

    • Existing Conditions: Don’t use fat burners if you have conditions like diabetes or hypertension, or if you're on medications. They might interact negatively.
    • Medication Interactions: Check with your doctor, especially if on prescriptions. Some fat burners can interfere with them.

    Consult Your Doctor: Always discuss with your doctor before starting fat burners, even if you’re healthy. They can guide on safety, efficiency, and appropriateness for your goals. They can also track your progress and adjust dosage.

    Best Fat Burners in Singapore

    If you are looking for some of the best fat burners in Singapore that you can try, here are our top picks:

  • JNX Sport, The Ripper, Fat Burner, 30 servings (150 g)
  • This is one of the most powerful and fast-acting fat burners on the market. It contains a potent blend of ingredients such as caffeine anhydrous, green coffee extract, green tea extract, guarana extract, raspberry ketones, cayenne pepper extract, and acetyl L-carnitine. These ingredients work together to boost your metabolism, energy, focus, mood, and fat-burning process. The Ripper also comes in delicious flavors such as pineapple shred, raspberry lemonade, blue raspberry ice cream, cherry limeade ice cream, and pink mango slice ice cream. You can mix one scoop of The Ripper with 180-250 ml of cold water and drink it 15-30 minutes before breakfast or before your workout.

  • Hydroxycut Hardcore Elite Performance Series 110 caps
  • This is another powerful and popular fat burner that contains four key ingredients: caffeine anhydrous, green coffee extract, coleus extract, and L-theanine. These ingredients help increase your thermogenesis, energy expenditure, alertness, and fat oxidation. Hydroxycut Hardcore Elite also helps suppress your appetite and enhance your mood. You can take one capsule twice a day 30-60 minutes before your two largest meals.

  • Hydroxycut Pro Clinical Hydroxycut 72 Capsules
  • This is a clinically proven weight loss supplement that contains a patented blend of ingredients called Hydroxycut Complex. This blend consists of robusta coffee extract (standardized for 45% chlorogenic acids), papaya fruit powder (Carica papaya), blackberry fruit powder (Rubus fruticosus), saffron extract (Crocus sativus), maqui berry powder (Aristotelia chilensis), caffeine anhydrous (1 3 7-trimethylxanthine), amla fruit extract (Phyllanthus emblica). These ingredients help boost your metabolism, energy levels, antioxidant capacity, and weight loss results. You can take two capsules twice a day 30-60 minutes before your two main meals.

  • EVLution Nutrition, Lean Mode, Fat Burner & Weight Management, 150 Capsules
  • This is a stimulant-free fat burner that contains five natural ingredients: green coffee bean extract, CLA, acetyl L-carnitine, garcinia cambogia extract, and green tea leaf extract. These ingredients help support your fat metabolism, appetite control, energy production, and antioxidant protection. You can take three capsules twice a day 30-60 minutes before your meals.

  • Mutant CARNITINE, Fat Burner, 90 Capsules
  • This is a simple and effective fat burner that contains only one ingredient: L-carnitine tartrate. L-carnitine is an amino acid that helps transport fatty acids into the mitochondria of your cells where they are burned for energy. This helps reduce your body fat and increase your muscle mass and performance. You can take two capsules twice a day with meals.


    Here are some of the most frequently asked questions about fat burners:

  • Are fat burners safe for everyone?
  • For optimal safety, healthy adults should adhere to label directions and precautions when using fat burners. Avoid use if pregnant, breastfeeding, a child, or on certain medications. Prior to intake, consult a physician.

  • How to know if fat burners are working?
  • Fat burners may boost metabolism, reduce appetite, or improve fat oxidation. They are not instant weight loss solutions. A balanced diet and consistent exercise are essential. Track weight, body fat, waist size, or other health metrics to monitor progress.

  • Do all fat burners have caffeine?
  • No, not all fat burners contain caffeine. Caffeine is often used because it can help burn calories by stimulating the nervous system. Some individuals may be sensitive, allergic, or wish to avoid caffeine. For these individuals, stimulant-free fat burners with natural ingredients are available. These alternatives do not cause jitters or insomnia.

  • Can I take fat burners without exercising?
  • Fat burners assist in weight loss without exercise but are more effective with it. Exercise benefits include calorie burning, muscle building, cardiovascular health, and mood enhancement. For optimal results, combine exercise with fat burner supplements.

  • How long should I use fat burners?
  • Fat burners should not be used continuously. Over prolonged use, they might become less effective or produce adverse effects. Ideally, use fat burners for 8-12 weeks, then pause for at least 4 weeks before starting again.

  • Can I combine fat burners with other supplements?
  • Fat burners can be combined with other supplements that support your health and fitness goals such as protein powders, multivitamins, omega-3s, or pre-workouts. However, you should be careful not to exceed the recommended dosage of any supplement or mix ingredients that may interact negatively with each other such as caffeine and creatine. Always read the labels and instructions of the supplements you are taking and consult your doctor if you have any doubts or concerns.


    In the quest for weight loss, fat burners can be a valuable tool, but they should be used wisely and in conjunction with a healthy lifestyle. Consult with a healthcare professional before adding them to your routine to ensure they are safe and suitable for your individual needs.

    Discover the science-backed secrets of our best-selling Fat Burner at Ultimate Sup. Unleash your ultimate potential today! 


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