Stacker 2 Review – 8 Things You Need to Know

Stacker 2 Review 

											- 8 Things You Need to Know
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Stacker 2 is a diet and energy supplement that claims to be “the world’s strongest fat burner.” Apparently, this diet and energy supplement, made by one of the world’s top pharmaceutical companies, can boost energy levels and raise metabolic levels. However, with so many of the product’s ingredients containing high amounts of caffeine, the chance of potential side effects is higher than normal.

Our research team wanted to learn more about Stacker 2 and its effectiveness, so delved into the ingredient research on white willow bark, yerba mate, and guggulsterone. In the end, we compared the research we gathered on the supplement to the few available customer testimonials to see if this pill made by “diet & energy specialists” is as amazing as they claim.

Stacker 2 can be purchased through their Official Site.

Stacker 2 Readers: Noom is offering our readers a risk-free trial, for a limited time. Click here for more information!

What is Stacker 2?

First off, Stacker 2 is a fat burner using the principles of the infamous ECA Stack. The ingredients are yerba mate, green tea, guggulsterone, cassia mimosoides, white willow bark, and caffeine 200mg. You’ll take one to three per day after meals. The blister pack makes it easy to take with you on-the-go. Supposedly, this formula promotes weight-loss by boosting energy levels and metabolism, but does science back this claim?

  • Journal of Functional Foods – Yerba mate has, in fact, been shown to have some impact on weight loss by increasing calorie burn.
  • Nutrients – If you partner yerba mate with exercise, it appears to increase metabolism and satiety, while improving mood.
  • Industrial Crops and Products – There’s even evidence that the waste leftover after processing is rich in antioxidant compounds – so yerba mate has some benefits to look forward to – based on research.

Stacker 2 was brought to the market more than 20 years ago by NVE Pharmaceuticals. It’s earned an “A+” rating with the BBB. It’s available at local stores and through the official website. We like it contains a few natural ingredients, and it appears to be affordable, but continue reading!

Its products include:

  • B12 10,000%+ Extreme Energy
  • Dexatrim Natural
  • Dexatrim Natural: Dexiflush
  • B12 Energy Drinks
  • Xtra Energy Shots
  • Black Beauty
  • Black Jax
  • Yellow Hornet
  • Swarm
  • Dexiburn
  • 7-Phenyl Stack
  • Yellow Jacket Energy
  • MethylHex 42
  • Stackerdrene
  • Keto Shot
  • Dexiflush

And more…

Stacker 2 Competitors

Green Tea Fat Burner
Black Beauty Diet Pills
Customer Service

Customer Service Contact Information

  • Address: NVE Pharmaceuticals – 15 Whitehall Rd. Andover, NJ 07821
  • Email – Customer Service: [email protected]
  • USA and International Sales: [email protected]
  • Contact form:
  • Phone: 973.786.7868
Side Effects

Stacker 2 Side Effects – “Look Out?”

The first concern was the intensity of Stacker 2 side effects. “This one contains multiple fat burners,” said our Research Editor.  “While they’re supposed to boost metabolism, there’s a chance you could experience adverse reactions.”

“I noticed it also made me jittery and sometimes gave me a headache,” said one user.

“Even after doing intensive workouts I still had too much energy. I had to stop taking them, because occasionally I had caffeine crashes. They are not fun at all,” offered another.

Side effects are rare, so we found some users that didn’t experience adverse reactions.

“No headache, jitters or anxiety like other caffeine pills,” commented a dieter.


Results – “No Weight-Loss!”

Based on some Stacker 2 reviews, there’s were customers that didn’t notice results. “I did not experience any weight loss on this product. I did have more energy, but I was looking for a fat burner,” said one customer online.

“The pill does give a great amount of energy, but the claim of it being a fat burner is bogus,” said a user.

Upon reading further reviews, some customers noticed results. “I tried them again, and they helped me lose weight,” explained a customer.

“After the first one, I felt warm and could tell my metabolism was increasing,” stated another.

Our research has shown if there is some particular part of a diet supplement that’s troublesome, like not producing results, the likelihood of long-term success is slim. If Stacker 2 doesn’t help you lose weight or burn fat, is it worth it?

The Science

The Science – “Legitimate?”

Some of the Stacker 2 ingredients are proven to work. The white willow bark extract, green tea extract, and kola nut are common ones that are mildly effective.

White willow bark is commonly used in weight-loss supplements due to its anti-inflammatory effects, according to Phytotherapy ResearchAdditionally, guggulsterones have been shown to have an appetite-suppressing effect, per the Journal of Dietary Supplements

However, the results have no ties to this formula. We at DietSupplement find clinical research to be important to the review process. When there’s no solid-science used to support the claims, we have concerns.



NVE Pharmaceuticals, an Andover, N.J., manufacturer of weight-loss supplements, filed suit March 9 in U.S. District Court, claiming that the Food and Drug Administration?s ban against ephedra violates the 1994 Dietary Supplement Health and Education Act.

NVE Pharmaceuticals filed for chapter 11 bankruptcy in U.S. Bankruptcy Court, District of New Jersey, on August. 10th 2005.

What Users Are Saying

What Users Are Saying

“I am only taking twice a day. Can’t take after dinner or I’ll never sleep. So I take one after breakfast and one after lunch. The energy is great! And I do think they help curb appetite. But so far I haven’t lost weight.”

“When I take Stacker 2 capsules, I have a great amount of energy but I don’t feel jittery. I also like how once I am ready to lay down for the night, they don’t keep me up.”

“They really do help and keep me energized throughout the day. As of losing weight and controlling appetite, doesn’t work. In need of energy? Definitely works.”

Bottom Line

The Bottom Line – Does Stacker 2 Work?

Will Stacker 2 help you lose weight? We like that it contains few natural ingredients and that we found some positive customer comments, but the lack of research showing it works is concerning. Also, reports of negative side effects and no real results leaves us a bit skeptical about giving it the thumbs up.

Sometimes the best means of losing weight is one you’ve not thought of before. We believe technology can help.

Among the best weight-loss apps on the market is Noom. Without a doubt, the clinically-proven system just works and you keep the weight off long-term, so no more yo-yo dieting. With human coaching, custom meal plans and an extensive nutritionist-managed food database, all you have to lose is weight.

Plus, Dietsupplement readers can take advantage of a free trial offer of Noom for a limited time.

Learn More About Noom »

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Stacker 2

What is Stacker 2?


Stacker 2 is a fat burner that uses the principles of the ECA Stack. It contains yerba mate, green tea, guggulsterone, cassia mimosoides, white willow bark, and 200mg of caffeine per serving.

How does Stacker 2 promote weight-loss?


Stacker 2 is designed to boost energy levels and metabolism, which can lead to weight-loss.

What are the side effects of Stack 2?


Some users have reported feeling jittery, experiencing headaches, and having caffeine crashes. However, side effects are rare.

What are the ingredients in Stacker 2?


Stacker 2 ingredients are yerba mate, caffeine, green tea leaves, guggulsterone, cassia mimosoides extract and white willow bark.

Does Stacker 2 work?


There’s no scientific research backing the effectiveness of Stacker 2. We found studies linking green tea and caffeine to weight-loss, but nothing specific to this formula.

Where can I buy Stacker 2?


Stacker 2 can be purchased using their Official Site.

How much does Stacker 2 cost?


Stacker 2 costs $19.95 on the official website.

How should I take Stacker 2?


You should take one Stacker 2 capsule, three times per day. Each bottle contains 100 capsules or about a 30-day supply. The company recommends not exceeding three pills per day.

How much caffeine does Stacker 2 have?


Each serving of Stacker 2 pills contains 200mg of caffeine.

Do Stacker 2 pills give you energy?


Stacker 2 pills does claim to help boost your energy, but users’ experiences when using the supplement are varied.

Does Stacker 2 contain ephedra?


Stacker 2 does not contain ephedra.

What was in the original Stacker 2?


The original Stacker 2 formula contained primarily ephedra, caffeine, and asprin. However, the new Stacker 2 formula does not contain ephedra or asprin per FDA regulations.

Is Stacker 2 a stimulant?


Stacker 2 is a weight-loss supplement that contains various stimulants. The most active ingredient in Stacker 2 is ephedrine, which is derived from the herb Ma Huang and acts as a stimulant to help burn fat and increase your energy levels. Other ingredients used in Stacker 2 include caffeine anhydrous, synephrine and yohimbine, all of which are stimulants known to speed up your metabolism. However, due to the presence of stimulants in this supplement, it’s important to be mindful when taking it – especially if you have heart or blood pressure problems.

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