Many people will turn to dietary supplements on their weight loss journey, as they are a quick and easy way to help you supercharge your results. There are also a great range of different options to choose from, like a natural appetite suppressant, a thermogenic fat burner, or an energy or metabolism boosting supplement.

That last one is often a particularly appealing option for any people who are looking to improve their body composition, as a metabolism booster completely alters the way in which your body processes the foods you consume. This means it can help you burn fat and build or preserve lean muscle mass at the same time.

The only issue is that, with so many different types of metabolism boosters on the market, it can be hard to work out which one is right for you. That is why we have made this list of the very best metabolism booster supplements, to help everyone find the right pills to achieve the healthy body weight that they desire.

Understanding Metabolism

Before we dive into the effectiveness of metabolism boosters, let's first understand what metabolism actually is. Metabolism refers to the chemical processes that occur within our bodies to convert food into energy. It involves the breakdown of carbohydrates, proteins, and fats, which are then used by our cells to function effectively.

There are different components of metabolism that contribute to the overall energy expenditure of our bodies. One such component is the basal metabolic rate (BMR), which accounts for approximately 70 percent of our daily energy use. BMR represents the amount of energy our bodies require to maintain basic functions while at rest.

Apart from BMR, physical activity and the process of digesting food also contribute to the calories we burn each day. Exercise and movement increase energy expenditure, while the digestion of food leads to diet-induced thermogenesis, which also burns calories.

When we diet however, we tend to subconciously move less, which is actually a large part of our "metabolism dropping" this makes stimulants like caffeine particularly useful for metabolism boosting as it naturally combats this compounding issue.

The Truth About Metabolism Boosters

Now that we have a basic understanding of metabolism, let's explore some common ingredients found in products that claim to boost metabolism. It's important to note that most of these ingredients are typically tested individually, so we'll assess their effectiveness based on existing research.

Caffeine: A Potential Metabolism Booster

Caffeine, a widely consumed stimulant, has been shown to increase thermogenesis and potentially boost metabolism. Studies have found that a minimum daily dose of 270 milligrams (mg) of caffeine can lead to increased calorie burning, as reported in a review article published in Obesity Reviews. However, it's worth noting that regular caffeine consumption may reduce this effect. Before adding more caffeine to your diet, it's advisable to consult with your doctor and ensure that your caffeine sources are not high in calories, as excessive consumption of sugary coffee drinks can lead to weight gain.

Capsaicin: Spice Up Your Metabolism

Capsaicin, the compound responsible for the heat in jalapeƱos, may have a positive impact on weight loss. Research suggests that capsaicin can increase calorie expenditure by approximately 50 calories per day, as reported in a review of 20 studies published in Appetite. While this may seem like a small number, it can contribute to long-term weight loss when combined with a healthy diet and regular exercise. 

L-carnitine: Fat-Burning Potential

L-carnitine is a substance that helps the body convert fat into energy. While it is naturally produced in the liver and kidneys, it can also be found in meat, dairy products, nuts, and legumes. L-carnitine has been found to have potential benefits for conditions like heart disease, peripheral artery disease, and diabetic neuropathy. However, its effectiveness as a dietary supplement for weight loss is still questionable. A study published in the Journal of Medicinal Food found some anti-obesity benefits of L-carnitine, but additional research is needed to fully understand its impact on weight loss. It's important to note that excessive consumption of L-carnitine supplements can lead to potentially dangerous side effects, so caution is advised.

Conjugated Linoleic Acid (CLA): A Mixed Bag

Conjugated linoleic acid (CLA) is a supplement that has been investigated for its potential role in weight and fat loss. However, research findings on CLA's effectiveness have been mixed. A review of studies published in the European Journal of Nutrition found small and uncertain effects of CLA on weight and fat loss. Additionally, gastrointestinal problems and fatigue are common side effects associated with CLA supplements. It's important to consider these factors before incorporating CLA into your weight loss regimen.

Green Tea: A Safe Addition

Green tea has long been touted for its potential weight loss benefits. While numerous studies have been conducted, the results have not shown significant effects on weight loss. However, a study published in Physiology & Behavior suggests that catechins and caffeine found in green tea may contribute to weight maintenance. Green tea is generally considered safe and can be a healthy addition to most people's diets.

Instant Knockout Ingredients

Caffeine is a potent and popular stimulant that will boost metabolism, give you more energy, and promote thermogenesis to raise your internal body temperature all at once. This will directly burn more calories and stubborn belly fat, while giving you the energy to train hard and lose weight even faster (1).

Green tea extract also contains a small amount of natural caffeine and is a mild appetite suppressant, but it is primarily included as it contains an antioxidant catechin called EGCG. This allows it to boost metabolism, fat burning, and energy levels, while preventing inflammation, overeating, injuries, and bloating (2).

Cayenne pepper extract contains a chemical called capsaicin, while black pepper extract has the alkaloid piperine, both of which are thermogenic fat burner ingredients which promote body fat burning directly.

However, both are widely used in dietary supplements as they are bioavailability enhancers. This means that they make it easier for your body to absorb the other ingredients they contain and make them more effective (3)(4).

L-theanine is an amino acid that is often taken in combination with stimulants, as it can prevent the crashes and sleep issues they sometimes cause. It will then also reduce fatigue and improve recovery, which will help to keep you healthy and working out, to ensure that you can achieve maximum weight loss (5).

Glucomannan is a type of insoluble dietary fiber with very few calories. It swells dramatically when it comes into contact with water in your gut, allowing it to function as a powerful appetite suppressant, which fills you up, prevents food cravings, and helps you consume fewer calories and stick to a healthy diet (6).

It also slows the rate that food is released from the gut, ensuring it is properly broken down and boosting metabolism even further.

Lastly, the three vitamins (b6,b12 d3) and will burn fat cells, suppress appetite, and improve the efficacy of all the other ingredients, while offering additional health benefits, like reducing the risk of heart disease, high blood pressure, and cholesterol, and blood sugar spikes (7)(8)(9). D3 has also been shown to improve athletic performance and energy levels as a stand alone, making it perfect for a metabolism booster. After all if you move more because you have more energy then you'll burn more calories.


  • Its formula is gluten free, vegan friendly, and FDA approved

  • Can promote weight loss from every angle

  • Features only optimally dosed, proven natural ingredients not banned by any major sporting bodies

  • Steps have been taken to prevent any of the side effects that metabolism boosters can cause

  • Boasts a reasonable price tag and money back guarantee

  • Well reviewed by users of all ability levels


  • Available for purchase exclusively on the official Instant Knockout Cut website

Instant Knockout Rating

By taking a thermogenic fat burner and metabolism booster supplement and adding appetite suppressants and ingredients to counteract any of the possible side effects caused by metabolic supplements, safe, effective weight loss becomes as easy to achieve as it could possibly be.

Add in a reasonable price tag and money back guarantee on every purchase, and it should be clear why we rank Instant Knockout Cut at the very top of our list of the best metabolism boosters.

Check Instant Knockout Deals

Thermogensesis Caffeine, capsaicin 5/5
Appetite Glucomannan 5/5
Cravings Glucomannan 4/5
Energy Caffeine + Vitamins 5/5

Final Thoughts On The Best Metabolism Boosting Supplements To Help You Lose Weight & Body Fat

Metabolism boosting supplements are a great way to help you achieve your goals, whether you are looking to burn fat and lose weight or build lean muscle mass. There are a number of great metabolism boosters out there to choose from too, although the best metabolism booster pills by far are Instant Knockout Cut.

With a formula full of high quality, optimally dosed, clinically proven ingredients that is designed to help the body burn fat without losing muscle mass, it is a perfect choice for people seeking total control over their weight management. It even comes with a money back guarantee in case you change your mind as well.

If for any reason it does not sound like the metabolism boosting supplement for you, one of the other picks on our list of the best metabolism boosters surely will be. For everyone else though, we highly suggest that you give Instant Knockout Cut a try and see just how well it can aid your weight management for yourself.