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Metabolic Boosters: Good vs Bad

The most commonly heard health advice is to lose weight. One of the ways to lose weight is to exercise, but everyone has such busy schedules, squeezing in a few minutes to lift some weights seems impossible, let alone doing a full work out.

Exercise is still the best way to lose weight, but if you have a hard time fitting it into your schedule, metabolism boosters might be your answer.

Metabolism is a process that converts food into energy that your cells need to function. A metabolic rate is how long it takes your body to process the food. There is also a resting metabolic rate (RMR). This rate is the amount of energy your body needs to maintain its basic functions while resting. Many metabolic measurements and treatments are based off individual RMRs.

Basically, if you have a slow metabolism and eat a lot, you are more likely to gain weight. Those with fast metabolisms will also gain weight when eating a lot, but they can get away with it longer. Many things influence metabolic rates:

  • Age
  • Genetics
  • Muscle mass
  • Height
  • Weight
  • Diet
  • Amount of exercise
  • Some medical disorders and medications

Yet, everyone’s metabolism can be quickened with metabolic boosters.

Metabolic boosters cause a process called thermogenesis. Thermogenesis increases heat production during digestion to help the body burn more calories, thus increasing metabolism. There are six main common metabolic booster supplements: caffeine, green tea, capsaicin, chromium picolinate, L- carnitine, conjugated linoleic acid, and resveratrol.


Caffeine stimulates thermogenesis. It tells the body to burn more fat both stored and currently being digested. Caffeine sends adrenaline throughout the body which put you in a fight or flight mode. In that stressful mode, the body is trying to use every bit of energy it can to maintain your body throughout the situation

Caffeine supplements do raise RMR by 3-11%, the larger doses having more effect. However, the effects of caffeine tend to lessen overtime. If you take a caffeine supplement you may be tempted to raise it, but do not do it. Caffeine is highly addictive. Even when you raise your caffeine intake, the effectiveness of caffeine will lessen again.

The best thing to do is create a cycle. For example, you may use a supplement for two weeks, then go off for a week. The cycle prevents addiction and keeps the supplement working.

However, studies show that caffeine does not work as well when someone is obese and gets less effective with older people. Caffeine supplements tend to work best on someone who is leaner and younger.

Green Tea

Green tea is considered a better supplement because it is not a drug. It is considered a more natural metabolism booster. Green tea is considered a safe addition to any diet.

This supplement has catechins and caffeine which may help with weight maintenance. There have been no significant finds on whether green tea assists with weight loss. Like caffeine, green tea does not seem to aid obese people with weight loss.


Capsaicin is a compound found in chili peppers that makes them spicy. Studies have shown capsaicin increases fat oxidation. This means fat is being used more for the body’s energy. But this supplement also shows no significant effects on a change in levels of body fat.

Capsaicin is also known to have several side effects, especially when taken in high amounts.

  • Stomach pain or irritation
  • Bloating
  • Increased risk of gastric cancer
  • Negative reactions with aspirin and blood-thinning drugs
  • Increased risk of heart attack

Chromium Picolinate

The body produces a small amount of chromium picolinate normally. It helps combat chromium deficiency. Chromium aids in the metabolization of glucose. Glucose is the body’s first energy source choice. A chromium deficiency could mean the body is not being sufficiently provided with glucose.

Though many studies have been done, chromium picolinate does not seem to have any effect on weight loss or metabolism.

Chromium picolinate has several side effects.

  • Fast, irregular heart rhythm
  • Kidney damage
  • Liver issues
  • Stomach irritation
  • Reduced effectiveness of insulin
  • May worsen depression, anxiety, and schizophrenia


L-carnitine is found in many meats, dairy products, legumes, and nuts. The body also produces L-carnitine naturally through the liver and kidneys. L-carnitine is suspected to aid the treatment of several disease, such as heart disease, peripheral artery disease, and diabetic neuropathy. It is also known to aid in turning fat into energy. However, scientists are still up in the air about whether L-carnitine helps with weight loss.

Though L-carnitine is suspected to be helpful, there are significant dangers associated with it. It is known to raise the risk of heart disease. L-carnitine reacts badly with bacteria in the stomach. The combination produces trimethylamine which clogs arteries.

Conjugated Linoleic Acid (CLA)

Like many of the other metabolic boosters, CLA has been the focus of many studies. They have mixed results about CLA’s metabolic benefits. Those that have seen positive results have an statistically insignificant amount of data to go by.

Furthermore, CLA is known to cause gastrointestinal issues and fatigue.


This product is found in many natural foods, such as the skin of grapes, some berries, knotweed, and peanuts. Resveratrol has many positive aspects. It aids in:

  • Lowering blood pressure
  • Protects the brain
  • Joint pain
  • May suppress cancer cells
  • Increase insulin sensitivity
  • Positive effect on blood fats

Yet, like most boosters on this list, there is not enough data to suggest resveratrol helps burn fat in humans.

When it comes to picking out a metabolism booster, I would suggest going with a caffeine or green tea booster, or a mix of both. Caffeine seems to be the most helpful booster, while green tea seems to be the most natural option. Green tea already has some caffeine. Make sure to not over consume caffeine with green tea. It might be a good idea to cycle with green tea like cycling with just the caffeine metabolic booster.

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Banks, M. (2018, May 07). Metabolism Booster | What is Metabolism and Increasing Metabolic Rate? Retrieved August 30, 2018, from
Colbert, T. (n.d.). L-Carnitine: Weight Loss Fact or Fiction? Retrieved August 30, 2018, from
Go Ask Alice. (n.d.). Chromium picolinate to boost metabolism? Retrieved August 30, 2018, from
Gunnars, K. (2018, May 04). Can Coffee Increase Your Metabolism and Help You Burn Fat? Retrieved August 30, 2018, from
Jennings, K. (2017, March 03). 7 Health Benefits of Resveratrol Supplements. Retrieved August 30, 2018, from
Morris, S. Y. (n.d.). Metabolism Boosters: Weight Loss Fact or Fiction? Retrieved August 30, 2018, from
WebMD. (1999, November 28). Green Tea Boosts Metabolism, Protects Against Diseases. Retrieved August 30, 2018, from
Wong, C., ND. (2018, January 29). Should You Spice Up to Slim Down? Retrieved August 30, 2018, from

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