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Stacker 2 Review - 6 Things You Need to Know

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.

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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.

Stacker 2 was brought to the market more than 20 years ago by NVE Pharmaceuticals. It’s available in at local stores and through the official website. We like it contains a few natural ingredients and it appears to be affordable, but read on…

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 really worth it?


The Science – “Legitimate?”

Some of the Stacker 2 ingredients have been clinically verified to work. The white willow bark extract, green tea extract and kola nut are common ones that have been shown to be mildly effective. However, the any results aren’t connected to this formula. We at DietSpotlight find clinical research to be important to the review process. When there’s no solid-science used to support the claims, we have concerns.

What Users Are Saying

“This product works for me. I have a slow metabolism and I take three a day after breakfast lunch and dinner to help digest as well as give me an extra energy boost. I’ve been using this for about 3 weeks and I have lost a few inches around my waist.”

“It helps me stay awake which is why I got it. It doesn’t help with weight loss, though.”

“I have been using Stacker 2 for a few years off and on for energy. This last bottle that I bought did not work the same. I did not experience any if the energy that I used to and instead it just increased my digestion. By this, I mean it would cause my stomach to grumble and then I would have to go to the restroom. I even bought a few from the Dollar Tree just to see if the same thing would happen, and it did, so it’s something that the company has changed in the ingredients. It is very disappointing because I used to take one in the morning and have energy all day and now I can take 2 and nothing but increased digestion. If you need increased digestion, then buy these but if you need energy buy something else.”

Bottom Line

The Bottom Line – Does Stacker 2 Work?

Will Stacker 2 help you lose weight? Well, 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.

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What are the side effects of Stack 2?

According to user comments, Stacker 2 side effects may include anxiety, nervousness, jitteriness, increased heartrate, irritability, sleeplessness, upset stomach, headaches and shortness of breath.

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.

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.

Where can I buy Stacker 2?

Stacker 2 can be purchased using their Official Site.

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.

20 Stacker 2 Reviews

  • Stacker 2
    Your Nadonnarachieleme (Verified Purchase)

    Gave me a headache made me nauseated

  • it did work for me
    Tina (Verified Purchase)

    I took stacker 2 many years ago. I believe it was in the 80’s and it gave me an incredible amount of energy and it was like it melted the fat away without diet and exercise. I swear by stackers 2. I couldn’t believe how it melted the fat away without even cutting out any of the food I normally eat and I had lost 90 pounds but once you stop with any diet pill you gain back the weight you lost and then some. Don’t get me wrong it did work for me but to keep the weight off you must continue to take the diet pill no matter what one it is that you’re taking.

    • Your Name

      Ya but you don’t always wana depend on a pill to make u loose weight , once u stop taking the pill u could start exercising more often or even on a simple duet such as fruits and veggies and if u love meat just watch how much your eating plus breads or anything along that line can lead to weight gain….?

  • New formula did nor worked for me !
    David Baker (Verified Purchase)

    I used the original stacker 2 when it had the ephedrine and it was awesome !! lost 80+ lbs but when they changed the formula it just did not work for me anymore. now years later I have regained the weight and am still searching for something that works !!

    • joanadaur

      Me too!!’m

  • Stacker 2
    Kimberly (Verified Purchase)

    Stacker 2 may not burn fat alone but it definitely gives your workout a boost!

  • They gave me energy !
    Veronica (Verified Purchase)

    I took two stacker 2 pills and they gave me energy but I got jittery and nauseated and I couldn’t sleep that night. I tried them again next day but only took about a 1/3 of a pill and I got better results.

  • Hope this works for me
    Your Name (Verified Purchase)

    I just got some to day I’m gonna try them be cause I hear their its good energy boost. So hope it works for me

  • Loved the product.
    mike (Verified Purchase)

    stacker works great for energy made it through a long day at work which usually drags on and on heart rate does go up a little but not bad as for the weight loss part not sure just started taking them today i took 1 after breakfest and 1 after lunch and no problems it delivers a big boost in energy

  • This works for me
    shawn williams (Verified Purchase)

    stacker work for me i have energy all day long i try others diet pills but i didnt have energy….for me i have to stick with stackers.

    • Marisol

      I agree! I only take one pill in am and that’s it. It gives me energy to work out and no side effects!

  • Good energy booster in small amounts
    keith (Verified Purchase)

    I use stacker 2 everyday. I only take 1/3rd of a cap,you dont need to take a lot to make it work.Small amounts will give you a boost without making you feel sick, your weight loss will come from diet and exercise not from pills.

  • Product is not good for my health
    donna davis (Verified Purchase)

    i been takin stackers2 for 1 week i felt like my heart was gonna bust my back hurts my stomac hurts my leggs feels like there jelly im so exculsted all i wanta do is sleep im soo sick i wanna die that i cant stand the pain im going to the er tommorow and get help i may end up sueing for this pain n suffring i have kids that i need to focuse on i trusted this diet pill all it did was put me in pain ill never take3 this trash agean thanks for this sevier pain i hope they take this junk off marketmarche

    • isaac

      Not for you you may have allergic reaction works great for me

      • Jerrod Walker

        You took 3 stacker 2 capsules at once? Jw cause the only way I get a boost is by taking 1 every couple of hrs

    • Your Name

      Tou should not take three at once and you can but not sue,you should know he risk and need to realize being smart and not overdosing is wise!

    • Your Name

      I’m sorry, but i guarantee you……you being that sick had nothing to do with Stackers.

    • Jason

      Well energy pills ain’t for u then

  • Product caused sickness
    joseph hyde (Verified Purchase)

    well stacker made me feel really bad and i got sick and my heart had pain in it so i dont know whats going on but i dont like it im not buy stacker no more bye

  • i was going to die
    cindy shippy (Verified Purchase)

    i thought i was going to die after taking stacker 3. they shouldnt be sold. my whole boby inside and out shook .