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GNC Mega Men Energy And Metabolism Review - Does This Multivitamin Work? Are side effects and ineffectiveness deal breakers?

By Summer Banks on Oct 04, 2016
GNC Mega Men Energy And Metabolism Review

Why is it that so few diet products are backed by science? Let’s find out if GNC Mega Men Energy and Metabolism is one of the good ones. There are people interested in this supplement, so we examined the ingredients, side effects, clinical research and quality of customer support. Additionally, we picked apart hundreds of consumer reviews and comments. We then refined and summarized to give you the info you need.


What is GNC Mega Men Energy and Metabolism?

First off, GNC Mega Men Energy and Metabolism is a “calorie-burning” multivitamin containing caffeine, capsicum seed extract, black pepper extract, green tea extract, amino acids and B-vitamins. The recommended serving is two capsules daily, which supposedly promotes weight-loss and increases metabolism. One of the benefits is the availability of the supplement.

There’s no information as to when the company first introduced GNC Mega Men Energy and Metabolism, but GNC was founded in 1935. It doesn’t appear the supplement contains artificial ingredients, a good start. We do like the amount of time the business has been in operation and the favorable BBB rating, but read on…

Side Effects – “Something to Worry About?”

The first negative aspect deals with GNC Mega Men Energy and Metabolism side effects. “When you take a multivitamin, it’s to support overall health and wellness,” said our Research Editor. “What you don’t expect are adverse reactions.”

“My body temp elevates, I feel jittery, light headed and my stomach acts up,” said a user.

“I cut ALL sources of caffeine out of my diet when I started taking this, and within just a couple days I was having feelings of my heart racing, shortness of breath, and my stomach was freaking out,” reported a customer.

Some reports of side effects may be associated with stopping the vitamin, for some, according to a review.

The user claimed, “I read that some users had headaches when they stopped taking it.. I have gone on week long trips and left these vitamins at home and have never experienced any type of side effect.”

Regulatory Issues

The New York Attorney General’s office contacted the parent company in March of 2015 relating to the mislabeling of products. The ruling stated several supplements didn’t contain ingredients listed on the packaging.

Ineffectiveness – “Another Issue”

Based upon numerous customer comments, GNC Mega Men Energy and Metabolism ingredients don’t live up to the hype. “I’ve never felt an upswing of energy from these. I’m a bigger guy (6’6″, 305) and consistently in the gym lifting weights. Even with an upped dosage I still don’t feel anything,” said a consumer.

“I tried this product for three weeks, I’m still taking it. Didn’t work for me, feel the same no increase energy,” commented a dieter.

On the other side, users see results.

One review said, “Since I’ve started taking these supplements I’ve had more stamina in sports, felt more energized later into the day, and felt better and more healthy as a whole.”

Another shared, “Even if this is all just a placebo effect.. it worked for me and that vitamin portion is still real.”

Based upon our research, if any part of a supplement is concerning, like not producing results, it could put a damper on long-term success. If GNC Mega Men Energy and Metabolism doesn’t help you lose weight, you’ll look for something better.

The Science – “Clinically Proven?”

According to the official website, GNC Mega Men Energy and Metabolism is “clinically studied”. We notice it contains a few proven ingredients, but the link between those and this formula isn’t there. Also, there’s no published scientific research supporting the weight-loss claims. At DietSpotlight, finding solid science is critical to the review process. If science-based facts aren’t there, we see a bigger issue.

The Bottom Line – Does GNC Mega Men Energy and Metabolism Work?

Are you racing out to buy GNC Mega Men Energy and Metabolism? Well, we like the low price and that we found a few positive comments, but we are skeptical about this one because the weight-loss claims are not supported by published clinical research. Plus, we’re concerned about it not working and customer reports of negative side effects.

If you’d like to lose that extra weight, we suggest going with a supplement not linked to harmful side effects and containing ingredients shown to help with weight-loss.

Among the best products we’ve seen in 2016 is one called Leptigen. The four clinically-tested ingredients have been shown to help accelerate metabolism, boost fat loss and reduce appetite. There’s no one talking about harmful side effects and the chatter online is about people seeing excellent results.

The company responsible for Leptigen is so confident in the supplement, they’re offering a Special Trial Offer, a nice bonus.

Get Your Sample Today »
About the Author:

Summer Banks is an ISSA-Certified Fitness Nutrition Specialist and has reviewed over 2000 diet products. She has years of nursing training, experience as a manager responsible for 15 supplement brands, and completed coursework on Food and Nutrition from Stanford University. full bio.

How Does GNC Mega Men Energy And Metabolism Compare?

Previous GNC Mega Men Energy And Metabolism Review (Updated October 3, 2014):

What You Should Know

GNC Mega Men Energy & Metabolism attempts to combine a healthy multivitamin with an energy booster. Its female equivalent is GNC Women’s Ultra Mega Energy And Metabolism. There are plenty of supplements out there that make this attempt, but most fail because there is either too much or too little caffeine. Caffeine is the primary, cheap ingredient to boost energy and it's effective at increasing metabolism, but it's not the only proven ingredient. This is made evident because similar products, like Man Scorch Fat Burner, utilize this ingredient. We found this supplement listed on GNC for $19.99; cheaper than other premium multivitamins.

List of Ingredients


  • Magnesium
  • Zinc
  • Selenium
  • Copper
  • Manganese
  • Chromium
  • Molybdenum
  • Vitamin A
  • Vitamin C
  • Vitamin D
  • Vitamin E
  • Vitamin K
  • Thiamin
  • Riboflavin
  • Niacin
  • Vitamin B6
  • Folic Acid
  • Vitamin B12
  • Biotin
  • Pantothenic Acid
  • Iodine
  • Green Tea Extract
  • Alpha-Lipoic Acid
  • Choline
  • Inositol
  • Silica
  • Boron
  • Lutein
  • Lycopene
  • Zeaxanthin
  • Astaxanthin
  • Vanadium

Energy and Metabolism Blend:

  • Black Pepper Extract
  • Caffeine Anhydrous
  • Capsimax Capsicum Seed Extract

Proprietary Amino Acid Blend:

  • L-Taurine
  • L-Methionine
  • L-Glutamine
  • L-Carnitine

Product Features

The majority of the ingredients in GNC Mega Men Energy & Metabolism are vitamins and minerals. These have no direct impact on metabolism or energy, but they do support healthy functions in the body that may impact both. Although other products containing the same ingredients boast the some claims to increase weight loss like with Purple Tiger Energy.

Then we hit the proprietary blends. One of the proprietary blends contains four amino acids. There are healthy functions for amino acids, but they are not effective at increasing metabolism or energy.

The ingredients that work to increase metabolism in this supplement are caffeine and green tea.

The caffeine is included in a proprietary blend with just short of 120 mg. That means there is not likely enough caffeine to increase energy or metabolism. There is only 40 mg of green tea extract - so metabolism support from the green tea is out of the question.

According to clinical studies, about 300 mg of green tea is required to boost weight loss. While we realize this supplement does not claim to boost weight loss directly, that is the implication when the product name claims metabolism support. Just 40 mg of green tea and less than 75 mg of caffeine is not enough to have any impact. Many products have secondary effects, like how Man Vaporize could possibly aid in kidney health.

See Our Featured


  • All ingredients are listed online.
  • The supplement contains green tea and caffeine.
  • A good source of vitamins.
  • Sells for less than most premium supplements.


  • Does not contain enough green tea.
  • Does not contain enough caffeine.
  • Will not support metabolism.


GNC Mega Men Energy & Metabolism is supposed to support a healthy metabolism and energy level. The ingredient list contains all the ingredients we expected, but it does not contain enough of either proven ingredient to have an impact on energy or metabolism. GNC Mega Men Sport is a more athletic version though not much different. This supplement is nothing more than a great multivitamin.

GNC Mega Men Energy And Metabolism Questions & Answers:

We compressed hundreds of user comments about GNC Mega Men Energy and Metabolism into this helpful FAQ.

What are the side effects of GNC Mega Men Energy and Metabolism?

Possible GNC Mega Men Energy and Metabolism side effects may include nausea, stomachache, diarrhea and headache. This is according to customer reviews.

What are the ingredients in GNC Mega Men Energy and Metabolism?

GNC Mega Men Energy and Metabolism ingredients are caffeine anhydrous, black pepper, capsicum seed, l-carnitine, taurine, l-methionine, l-glutamine, green tea, choline, inositol, alpha-lipoic acid, vanadium, astaxanthin, lycopene, zeaxanthin, lutemax 2020 lutein, boron, molybdenum, chromium, manganese, copper, selenium, zinc, magnesium, iodine, vitamin A, calcium, vitamin C, pantothenic acid, vitamin K, biotin, folic acid, vitamin D, niacin, vitamin B12, riboflavin, vitamin B6, vitamin E, thiamin and silica.

Does GNC Mega Men Energy and Metabolism work?

GNC Mega Men Energy and Metabolism contains green tea and caffeine; both shown to boost metabolism. These ingredients have been clinically-tested and may help with weight-loss, but the benefits of the two are linked to this product.

How much does GNC Mega Men Energy and Metabolism cost?

The cost of GNC Mega Men Energy and Metabolism is $49.99. However, the member price is $44.99.

How should I take GNC Mega Men Energy and Metabolism?

The directions say to take one packet daily with food. A box will last for 30 days.

How do I contact the GNC Mega Men Energy and Metabolism customer service department?

You can contact the GNC Mega Men Energy and Metabolism customer service department by calling 1-877-462-4700 or by using the feedback form on the official website or by writing letters to GNC 300 Sixth Ave. Pittsburgh, PA 15222.

Can I contact GNC Mega Men Energy and Metabolism through social media?

Yes, you can contact GNC Mega Men Energy and Metabolism through Facebook and Twitter.

Can I take GNC Mega Men Energy and Metabolism if I have a health condition?

First off, women who are pregnant or nursing should speak with a doctor before taking GNC Mega Men Energy and Metabolism. The same applies to people with health conditions and those taking prescription drugs. If you’re under 18, you should not take this weight-loss product.

What do users like about GNC Mega Men Energy and Metabolism?

Some people like that GNC Mega Men Energy and Metabolism provides vitamins and minerals. Also, there are customers that say this boosts energy levels.

What do users not like about GNC Mega Men Energy and Metabolism?

Some users do not like taking six pills at once. Others say they don’t get the weight-loss results from this supplement.

Can women use GNC Mega Men Energy and Metabolism?

Yes, but it’s not recommended. This product is formulated for men.

Is there an age cut-off for GNC Mega Men Energy and Metabolism?

No, as long as you are 18 or older, you can take this product.

Do you know of any special deals or discounts on GNC Mega Men Energy and Metabolism?

Yes, there is a member price for GNC Mega Men Energy and Metabolism, which will save you $5.

GNC Mega Men Energy and Metabolism is essentially a multivitamin with a few extra ingredients to boost metabolism and support energy. The label says "Clinically Studied" but that's true of all multivitamins.

GNC Mega Men Energy And Metabolism Ingredients and Supplement Facts

Serving Size: 2 Caplets
Serving Per Container: 90
Amount per Serving % DV
Energy and Metabolism Blend 150mg *
- Caffeine Anhydrous * *
- Green Tea Extract * *
- Eleuthero Root Extract * *
- Capsimax Capsicum Seed Extract * *
- Black Pepper Fruit Extract * *
Super Antioxidant Blend * *
- Alpha-Lipoic Acid 25mg *
- Lutemax 2020 Lutein 2mg *
- Lycopene 1mg *
- Turmeric Root Extract 500mcg *
- Zeaxanthin 400mcg *
- Astaxanthin 50mcg *
- Beta-Cryptoxanthin 10mcg *
Choline 10mg *
Inositol 10mg *
Silica 4mg *
Boron 2mg *
Vanadium 10mcg *

Other Ingredients: Cellulose, stearic acid vegetable source, magnesium stearate vegetable source, titanium dioxide, natural vanilla mint flavor, talc, caramel color, stevia leaf extract

We dug deep into the GNC Mega Men Energy and Metabolism ingredients to give you the crucial details you need.

Caffeine Anhydrous

Caffeine is a stimulant and mild diuretic. It comes from natural sources such as tea leaves, coffee beans, kola nut, guarana and yerba mate plants. Anhydrous is simply a dry or powder version, which is often found in diet supplements, energy pills and weight-loss products.

What is it Supposed to Do?

Usually caffeine anhydrous is added to diet supplements as a stimulant. It’s intended to boost metabolism, reduce appetite, enhance focus and improve athletic performance or energy levels.

Clinical Research

“Caffeine may stimulate thermogenesis — one way your body generates heat and energy from digesting food,” says the Mayo Clinic.

Green Tea Extract

Green tea is also known as camellia sinensis. Unlike black and oolong varieties, this tea is unfermented. It’s consumed in several parts of Asia as a health beverage, and is also found in numerous diet supplements for weight-loss.

What is it Supposed to Do?

Green tea contains catechins (antioxidants) and caffeine (a stimulant). These components work together to boost metabolism, improve immune system and heart health, elevate energy levels and promote fat loss.

Clinical Research

WebMD states that, “Green tea has been shown to improve blood flow and lower cholesterol. A 2013 review of many studies found green tea helped prevent a range of heart-related issues, from high blood pressure to congestive heart failure.”

Eleuthero Root Powder

More commonly known as Siberian ginseng, eleuthero root is a plant that’s native to regions like Russia. It has been used for centuries to make medicine to treat cold and flu symptoms, mental fatigue, diabetes, bronchitis and high blood pressure.

What is it Supposed to Do?

Typically eleuthero root is added to diet supplements to help lower stress levels, boost immune system health, and improve mental and physical performance. This in turn may aid with weight reduction.

Clinical Research

According to the University of Maryland Medical Center, “Siberian ginseng is often said to improve athletic performance and increase muscle strength. While some studies have found positive results, others have found that Siberian ginseng had no effect.”

14 User Reviews About GNC Mega Men Energy And Metabolism

Leave comments below
  • 1
    Your Name JOHN ISHAK

    Hi im from Ontario Canada I just bought a box of 90 capsules, $ 33.00, to day October the 11th, 2016 I have been taken my third pill, So Far so Good, I am Living the Dream. Feel Lots Energy, Not Sleepy. Let’s cross our fingers and experience referent. Regards John Ishak


  • 2

    Can these cause insomnia?


    Anna (Editor)

    Hi Francisco. All users are different and can experience different effects; if you begin to have insomnia, consult with your physician before continuing with this product.


  • 3

    I’ve been taking this plan for about a month. This morning for the second time I’ve experienced flushing and a rash that starts at my face/head and then moves down my neck and arms. Not a great feeling that comes on suddenly. I’ve been trying to keep this to almost an every other day regimen; but have been mostly happy with results.


  • 4
    isaac essuman

    I just bought a box of 30 Sachs each containing 6 cupsules, can I take all


    Jessica (Editor)

    Hi Isaac! For detailed product and usage instructions, please refer to the GNC official website for more information.


  • 5
    Boogie man

    I notice the difference between Mega Men Sport and Mega Men Energy Metabolism. Energy does speed up you metabolism and I’ve managed to lose a free pounds and keep it off. On the negative side it does speed your heart rate up and make you feel jittery. It doesn’t happen everyday. Mega Men Sport is food for recovery and keeping muscle on.


  • 6

    GNC Mega Men Energy And Metabolism is giving me a lot of energy, but I am bloated and gaining weight. I like the increased energy but, I do not like the feeling of being bloated, putting on added weight, and fighting additional chronic pain after I do too much daily.



    Steve is absolutely correct, the weight gain is unbelievable but the energy is great not worth the time if you’re trying to lose weight great energy but I don’t need the weight gain


  • 7

    I would like to kno is it a time release product,and if so when should I take it for best results .


    Your Name

    This product is excellent. I am chef and i used to work 7 days a week on cruise ships, trust me, these supplements kept me energized all day and i would sleep soundly at night. They also keep you mentally alert. In my job i would start to get tired around 3pm but when i take 2 of these pills (anytime before midday but not too early) i would be happy and enthusiastic all day. 3 years now and no side effects- never felt better.


  • 8

    I’ve tried different vitamins , I realized that this one works for me.


  • 9

    I’m trying these out Im really not In to takin pills and stuff like that jus wondering if there good or have any bad effects


  • 10

    Good products no complaints


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