Updated: 11/17/2015 - Sponsored by Leptigen

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

Editor's Review: 3.5 / 5.0

gnc-mega-men-energy-metabolism-multivitamin-product-imageWhy 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 delved into 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.

EDITOR'S TIP: Substitute GNC Mega Men Energy And Metabolism with a proven fat burner such as Leptigen for better results.

What You Need to Know

First off, GNC Mega Men Energy and Metabolism is 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.

Scroll below for one of the best products we’ve seen in 2015.

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.

“I didn’t really notice any energy effect. I won’t buy these again mainly because I have had better multivitamins in the past. Combine that with no feeling of extra energy plus the horrible,” offers a customer.

Based upon our research, if any portion of a supplement is thought of as a concern, like ineffectiveness, it could put a damper on long-term success. If GNC Mega Men Energy and Metabolism doesn’t live up to the dieter’s expectations, they’ll not buy it again.

The Science – “Clinically Proven?”

According to the official website, GNC Mega Men Energy and Metabolism is “clinically studied,” yet we can’t locate published scientific research linking the formula to weight-loss. At DietSpotlight, finding support for claims is a big piece of the puzzle. If a company can’t provide science, there’s a problem.

The Bottom Line – D0es GNC Mega Men Energy and Metabolism Work?

Ladies and gentlemen, ready for the final word on this one? After an extensive review of GNC Mega Men Energy and Metabolism, we’ve come to a conclusion. There are some positives, like the length of time GNC has been in business and we found a few favorable customer comments, but we are skeptical about recommending it because the weight-loss claims are not supported by published clinical research. Plus, we’re concerned about the FDA’s interactions with the company.

If you’d like to lose more weight, we recommend going with a product that contains ingredients proven with clinical studies that are not associated with negative side effects.

Among the best products we’ve seen in 2015 is one called Leptigen. The four-ingredient proprietary blend has been shown in published scientific research to enhance metabolism and boost fat loss. There’s no one talking about adverse side effects and dieter comments on the web show people are seeing excellent results.

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

Learn More About Leptigen »
GD Star Rating

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

Click Here To See Our Highest Rated Review

GNC Mega Men Energy & Metabolism attempts to combine a healthy multivitamin with an energy booster. 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. 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.

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.

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. This supplement is nothing more than a great multivitamin.

5 User Reviews About GNC Mega Men Energy And Metabolism

Leave comments below
  • 1

    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.


  • 2

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


  • 3

    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


  • 4

    Good products no complaints


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