Updated: 01/10/2018

The makers of Animal Stak have been around for a while, so we had to jump into the ingredients of this product to check out the “special sauce.” Next, we read some customer reviews on potential side effects of this testosterone booster – so we took a closer look to find the culprit (or culprits). Customers aren’t happy with the amount of pills in each serving, so we needed to review the scientific research – grasping desperately for a reason why this supplement requires so many capsules per dose. Finally, we summarized our findings to bring you the bottom line.

Animal Stak Readers: Click here to find out why we're giving away samples of our product, Boost.

What is Animal Stak?

First of all, Animal Stak is a testosterone-boosting supplement designed to enhance strength and performance while naturally raising your testosterone levels.  It’s called the “complete anabolic support stack” by the makers, promising a cutting-edge, non-hormonal product.

We’re curious to get into the ingredients here since you need to take so much of it with each dose. The combined ingredients in Animal Stak are extensive, including:

  • Tribulus Terretris Extract
  • Longjack Extract Complex
  • Fenugreek Seed
  • Stinging Nettle Root
  • Maca Extract
  • Mucuna Pruiens Seed
  • L-Carnitine Fumarate

The list goes on. The very first thing we noticed, however, were the quality of some of the ingredients, which is a good start. These ingredients are supposed to naturally increase a man’s testosterone levels, while increasing energy and helping with muscle recovery.

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Animal Stak Directions

You’re instructed to take one pack of capsules per day for 3 consecutive weeks. Take it 30 minutes before your exercise on training days. On days when you aren’t training, take on an empty stomach, between meals.

For best results, you should cycle this supplement for three weeks on and take one week off.

The one issue that’s rarely mentioned in the directions is the number of capsules you’re supposed to take. One customer reported that there were eight capsules in each serving or “pack.” That’s a fistful of pills not many people are willing to down.

Animal Stak Customer Testimonials

Animal Stak Ingredients

Here’s the part where we take a close look at the ingredients of the supplement. For this price, we want to make sure that the formula is proven to work – otherwise, you might as well just stack your money up and toss it out the window.

Tribulus Terretris Extract

This fruit-producing Mediterranean plant has been taken for years to enhance athletic performance, improve bodybuilding results in a post-cycle therapy or PCT program, as well as for a slew of other health benefits – including heart and circulatory conditions.[1]

In a study by the Journal of Alternative and Complementary Medicine, Tribulus terretris extract was tested to show the benefits it had on sexual behavior and intracavernous pressure (ICP).

The study concluded, “The increase in ICP which confirms the proerectile aphrodisiac property of TT could possibly be the result of an increase in androgen and subsequent release of nitric oxide from the nerve endings innervating the corpus cavernosum.”[2]

Fenugreek Seed

This ingredient is an herb, much like clover, and is also native to the Mediterranean region. You use fenugreek seed for a wide range of benefits, including upset stomach, constipation and inflammation.

Additionally, it helps treat menstruation issues, diabetes, erectile dysfunction, and obesity. [3]

The Iranian Journal of Pharmaceutical Research wrote, “Adjuvant therapy to the fenugreek seeds extract (with metformin) in PCOS women improved the sonographic results and menstrual cyclicity.”[4]

Ihe International Journal for Vitamin and Nutrition Research carried out a study on 24 type-2 diabetic participants to “evaluate the hypoglycemic and hypolipidemic effects of fenugreek seeds in type 2 diabetic patients,” concluding that, “fenugreek seeds can be used as an adjuvant in the control of type 2 diabetes mellitus in the form of soaked in hot water.”[5]

Stinging Nettle Root

As scary as this ingredient sounds – it’s not. Stinging nettle root is used for urinary issues, mostly.

In Greek times it was used as a laxative, while today it can be applied to the skin to treat aches and pains, oily hair, and even hair-loss.[6]

There is some research out there backing this ingredient for its ability to relieve prostate enlargement, but nothing that backs this formula at all.

Longjack Extract Complex

Longjack, or Eurycoma longifolia, is an evergreen shrub tree native to Southeast Asia. This ingredient is used in Malasian medicine for its potential benefits on sexual performance.

The Journal of the International Society of Sports Nutrition conducted a study on 63 participants to see if Eurycoma longifolia could improve stress hormone profiles.

They concluded that, “…daily supplementation with tongkat ali root extract improves stress hormone profile and certain mood state parameters, suggesting that this “ancient” remedy may be an effective approach to shielding the body from the detrimental effects of “modern” chronic stress, which may include general day-to-day stress, as well as the stress of dieting, sleep deprivation, and exercise training.”[7]

Maca Extract

Maca has been cultivated as a vegetable crop for over 3,000 years in Peru. Closely related to the radish, maca is taken to fight fatigue and enhance athletic performance, stamina and memory.

In a systematic review by BMC Complementary and Alternative Medicine, researchers wrote, “The results of our systematic review provide limited evidence for the effectiveness of maca in improving sexual function. However, the total number of trials, the total sample size, and the average methodological quality of the primary studies were too limited to draw firm conclusions. More rigorous studies are warranted.”[8]

While some of these ingredients are backed by research, which we love, it doesn’t tell us much if there’s no scientific evidence on the formula – which we don’t love.

Side Effects

Animal Stak Side Effects

Here is where we dive right into the potential side effects of the product to see if the juice is worth the squeeze, or in this case if the testosterone booster is worth the price tag.

First, the side effects mentioned by customers included:

  • Diarrhea
  • Insomnia
  • Acne
  • Erection Problems

There is also a chance that testosterone supplementation could shut down users’ hypothalamic-pituitary-testicular axis, or HPTA.

It’s important to note that everyone is different and reacts differently to specific ingredients. Just because some users had a negative experience, doesn’t mean you will too.

With that being said, let’s take a look at the possible side effects of some of the ingredients:

Longjack Extract

  • Insomnia
  • Restlessness

Not getting a full night’s sleep can decrease sex drive – counterproductive for a supplement claiming to increase your sex drive.[9]

Stinging Nettle Root

WebMD says that Stinging Nettle is “possibly safe” when taken by mouth up to 2 years. Beyond that – you’re on your own. Possible side effects can include:[6]

  • Upset Stomach
  • Sweating

Stinging Nettle Root

The site also mentions that there is “some evidence stinging nettle above ground parts can decrease blood sugar levels. It might increase the chance of low blood sugar in people being treated for diabetes.”

Maca extract

This ingredient is possibly safe when taken by mouth in larger amounts (three grams per day for four months).[10]

Maca contains goitrogens, substances that could disrupt the normal function of the thyroid gland. If you have a pre-existing thyroid condition, this isn’t for you.[11]

L-Carnitine Fumarate

This amino acid is produced naturally by the body, but if taken in a supplement, there are some potential side effects to worry about.

  • Nausea
  • Vomiting
  • Upset Stomach
  • Diarrhea
  • Heartburn

WebMD also says that this amino acid is more likely to cause seizures in people who are prone to have them or who have had them before.[12]

Animal M Stak

Animal Stak and Animal M-Stak

Animal Stak is an overall boost of testosterone for those seeking to up their energy levels and libido, while also wanting to lose fat and gain muscle. This is especially good for people over 35 whose testosterone levels are failing.

Animal Stak also contains a hormone amplifying blend containing l-carnitine and agmatine sulfate, intended to optimize how well your testosterone works.


Animal M-Stak, on the other hand, is a revamped formula intended specifically for bodybuilders and those seeking to make large muscle gains. If you need to boost your testosterone for muscle, Animal M-Stak is a better choice and leads to good results for body composition.

However, Animal Stak, contrasted with the M equivalent, contains zinc, magnesium, and vitamin D3. Research has shown that these three component are very useful when wanting to increase one’s testosterone levels.

Let’s get into something a bit more positive here. Animal Stak claims to deliver a host of benefits including:

  • Natural Testosterone Boost
  • Improved Muscle Size
  • Increased Energy
  • Enhanced Libido

While the claims are certainly there, we want to know what the customers are saying. Our research team read through dozens of online reviews and found that most users see results. This isn’t too shocking considering that some of the ingredients, like tribulus terretris extract and fenugreek seed extract, do work.

Increased Muscle Mass and Strength

We review supplements, so it was a no-brainer to at least touch on the potential benefits this supplement can have on your muscle mass and strength.

Tribulus terrestris has been shown to boost testosterone levels by “attenuating the luteinizing hormone or the follicle stimulating hormones” and has been shown to help increase muscle size and strength.[13]

The Journal of the International Society of Sports Nutrition carried out a controlled trial testing the effects of Fenugreek on 49 men. It concluded that “500 mg of this proprietary Fenugreek extraction had a significant impact on both upper- and lower-body strength and body composition in comparison to placebo in a double blind controlled trial. These changes were obtained with no clinical side effects.”[14]

There are some well-researched ingredients in this t-boosting supplement, but without knowing the exact formula, it’s impossible to prove that it works beyond a couple of specific ingredients.

So while there is some positive talk of results, the majority of the complaints were for the number of pills they require you to take and the overall customer service of the company.

It’s a shame – if you’re going to use ingredients backed by science, why not deliver excellent customer service and a supplement that’s easy to take?


Animal Stak Price

Now seems like a good time to jump into the cost of this performance-enhancing supplement. In this case, it’s fairly reasonable. It sells on the official website for around $43.00. You can also find a variety of supplements on Amazon for around the same price.

Universal Nutrition sells this product, but unfortunately, we couldn’t find anything about free samples, trial packs or money-back guarantees on the website.

Where to Buy

Where to Buy

Amazon.com has a broad variety of both animal stak and animal M-stak in stock.

GNC also stocks animal stak, but only of the M variety.


Animal Stak Alternatives

As far as testosterone boosters are concerned, there’s no shortage of alternatives out there. If you’re looking for something in the same realm, but don’t feel like taking a handful of pills – there’s something else out there for you.

Some other t-boosters and growth hormone supplements are:

Always research a product before buying it – we found some minor issues with those other products as well, like side effects and lack of results. It’s also important to keep in mind, what doesn’t work for others could still work with you. Know your body and know your limits.

What Users Are Saying

“Animal Stak is the best Testosterone booster that I have taken. I have been taking them for over a week and started feeling the effects after 3 days. Many Testosterone boosters I have paid a lot of money for and have felt no difference. With Animal Stak, I am lifting better and getting better body definition. If you are middle age this product will give you extra strength in the gym and in the bedroom.”

“I didn’t feel much of a difference in terms of lifting capability from the use of this product. It did help give a mental boost in thinking I could do more. It was also a lot of pills to have to take.”

“Animal Stak is absolutely worthless. You would be better off taking a sugar pill. I experienced absolutely nothing while taking this.”

Bottom Line

The Bottom Line – Does Animal Stak Work?

So are we telling you to run out and buy some Animal Stak to increase your strength, testosterone levels and overall performance? There are some key factors here that we like, for example, a couple of ingredients in the formula are effective. We also thought the price was pretty reasonable – but the buck stopped there.

We couldn’t get past:

  • Super high doses – wow
  • No scientific research on the formula – bummer
  • No money-back guarantee or discounts on the official website – ouch

If you want to boost testosterone levels, increase energy and improve overall performance, we suggest a product with proven ingredients and amazing customer service.

Among the best products we’ve found this year is the supplement Boost. It’s a blend of nine ingredients. All clinically-tested with results showing help improving testosterone levels, strength, energy and more.

Also, they’re convinced you’ll love the supplement, so they’re offering a 120-day money-back guarantee and multiple-bottle discounts.

Learn More About Boost »
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Previous Animal Stak Review (Updated June 15, 2013):

What You Should Know

Animal Stak is a strong fitness supplement created for men who want to lift longer and stronger in the gym. Lifters who are posting great gains and increased reps in the gym, not the goal of every dieter, give testimonials supporting Animal Stak. Dieters should know that some of the ingredients in Animal Stak are included to boost testosterone or reduce estrogen. This could have a negative effect on female menstrual cycles and body hair growth. Some men report increased anger when taking natural testosterone boosters.

List of Ingredients

Vitamin C, Vitamin B6, Magnesium, Zinc, Chromium. Natural Test Complex: Tribulus Extract Complex, Longjack Extract Complex, Avena Sativa Extract. Growth Hormone Secretagogues: Mucuna Pruriens Extract, Alpha Glycerylphosphorylcholine. Vasodilator Complex: Arginine Alpha-Ketoglutarate, Arginine HCL. Aromatase Inhibitors: Calcium D-Glucarate, Diindolylmethane. DHT Blockers: B-Sitosterol, Saw Palmetto Extract, Quercetin. Cortisol Inhibitor Complex: Acetyl-L-Carnitine, Phosphatidylserine. Liver Detoxifiers: Milk Thistle Extract, Lysophosphatidylcholine.

Product Features

There are many ingredients in the Animal Stak, but that is because each packet contains several different tablets. Animal Stak is formulated for use with Animal Test and Animal M-Stak for bodybuilders who want to gain even more muscle and strength. The first few ingredients are basic vitamins and have little to no value for weight loss or fat burn. The real magic begins with the Natural Test Complex. This complex includes testosterone boosters to create the perfect environment in the body for muscle growth. These ingredients will not increase weight loss. The Growth Hormone portion of Animal Stak includes a mind-altering herb, Mucuna Pruriens Extract. This herb is used as an aphrodisiac and antidepressant in many cultures. There is mention of lucid dreaming and increased libido. Vasodilator may not be a common word in a dieter's vocabulary, but it is one that bodybuilders and weight lifters use often. Vasodilators open veins to increase blood flow, essentially carrying the supplement throughout the body more quickly. Dilation of the veins is also a common mental boost during lifting, as veins appear larger than normal size. The Aromatase Inhibitors block production of estrogen. This creates the perfect environment in the male body for muscle gains and growth, but does not have a positive effect on women, in most cases. Some research studies have shown supplementing Calcium D-Glucarate in the female body reduces the risk of estrogen fed cancers. DHT Blockers are included in many male supplements because boosting testosterone boosts DHT, which leads to male baldness. In an attempt to stop hair loss, DHT blockers are included. Typically, bodybuilders will take prescription DHT blockers, but saw palmetto is considered one of the most effective natural ingredients to block DHT. Cortisol can cause the body to store abdominal fat and thus the Cortisol Inhibitor. Liver detoxifiers help cleanse the body to prevent negative side effects from any of the abovementioned herbal ingredients. Animal Stak sells for $58.95 for 21 packs. According to the official website, one pack of supplements is to be taken 30 minutes before a workout. After three weeks on, dieters should take one week off.


  • Could support muscle growth.
  • Inhibits hair loss.


  • Most ingredients are aimed at men trying to build muscle.
  • Women may see negative side effects from testosterone boosting ingredients.


Animal Stak is not a weight loss supplement for everyone. The long list of ingredients includes many just for men who want bigger, stronger muscles - not men and women trying to lose weight.

Article Resources
Summer Banks Dietspotlight Author
About the Author:

Summer Banks, Director of Content at Dietspotlight, has researched over 5000 weight-loss programs, pills, shakes and diet plans. Previously, she managed 15 supplement brands, worked with doctors specializing in weight loss and completed coursework in nutrition at Stanford University. full bio.

23 Animal Stak Reviews

  • Dissapointed
    Yunus jeftha (Verified User)

    Absolutely did nothing for me.

  • stack products
    rigo guerra

    what is the difference between all the animal stack products?

    • Marc S

      They have different goals. If you want gains its likely your test production reduces after 30 so animal stak is probably for you.stuff works great and i feel great. On top of the world. 21 day cycle then 30 days rest between.

  • I strongly feel i should test this.

    Hi, i was wondering if i can take stak on half dose ? or once every 2 days? actualy i am afraid try the full dose as i dont know what to expect from it. i have done loads of homework/research and i strongly feel i should test this first. any advice ? Thx. Kevin

    • Windycitybro

      My advice is to try’s full pack first and note the results. If you aren’t jumpy or jittery or overly irritable then imo I don’t see the harm in taking the full dosage.

      One tip though avoid any caffeine before you consume as some ingredients aren’t good with caffeine.

      If you do take caffeine I would suggest at least 4 hours after taking it. But you’ll find that you won’t need an additional pick me up as the B vitamins are more that enough for the energy you’ll need.

      Hope that helps

    • Maribel (Editor)

      Hi Kevin! For detailed product and usage instructions, please refer to the Animal Stak official website for more information.

  • what age

    At what age can you start using Animal Stak?

    • Maribel (Editor)

      Hello Dylan. This product is to be only used by adults 18 years and older.

  • Will animal stak gain muscle faster???

    I am a little bit chubby and I gym hard I have lost a lot of weight and wanna gain muscle now but don’t want to get any fatter….. Will animal stak make me any fatter or will I just be the same but gain muscle faster???

    • Windycitybro

      this isn’t a weight gainer so no worries. It will increase blood flow to the muscles to provide more energy and sustained workouts.

    • Maribel (Editor)

      Hello Revvan. All users are different and can experience different weight-loss results, but exercise in conjunction with a healthy diet and supplements have shown to help with weight-loss and possibly muscle gain.

  • Will this effect fertility ?

    Dear i have bought this product but still not using. because i have a little bit doubt that it can be effect my fertility. Kindly guide me before getting start.

    • Devon (Editor)

      The product doesn’t contain any soy or other ingredients known to conflict with pregnant or nursing mothers. Please take this formula to your doctor so that she/he may better advise you in this matter.

  • Is the product still safe?
    abednigo maxwell (Verified User)

    hello i have bought one animal stak but did not use it right away when i opene it i noticed some of the tablets have small holes and the others got soft. is it ok to use

    • Maribel (Editor)

      Hello Abednigo! Please review the expiration date, since it is not recommended to use products after their listed expiration date.

  • edwin

    Hi. I understand from the web that it states on training days we consume at least 30 mins prior to workout and on non training days empty stomach between meals. It shows differently on the can where by on non.training days prior to bed. Would appreciate your advice on this as to which alternative would.be better. Regards

    • Veronica

      Hi Edwin. Please refer to the Animal Stak For detailed product and usage instructions. If you feel concerned, try calling customer service of the company, they should be able to explain the instructions.

  • Zyzz

    California Residents Proposition 65 warning:This product contains a substance known to the state of California to cause birth defects or other reproductive harm.This is what writes under the cover of this product?????so shoud you take this or not??????????

    • Jessica (Editor)

      Hello. All users are different and can experience different side effects; please make sure to consult with your physician before taking this product.

  • Wanna
    Marc S

    If you wanna be a full steam all out f…ing animal then animal stak is probably for you. Thank you , Thank you very much

  • May I use Animal stak or other supplement with libido?

    Dear all,

    I am 30 years old and I didnt make any body building since long time and I have noticed some decrease in my Libido and rarely morning wood, so I am planning to play body building again so I can get back my strength and get my libido back, I bought some supplement : animal stak and whey Gold standard to boost my recovery and get some extra testosterone, I still didnt use them and I need your advise, is it the right procedure?? knowing that I was really so horny guy before one year!!!

  • It contains statte to cause birth defects or other reproductive harm, I hope to start a family in the near future. What your advice would be?

    Hi I have just purchased animal stak and it says on the inside lid’ this product contains a product known to the statte of california to cause birth defects or other reproductive harm’
    I hope to start a family in the near future and this concerns me.just wondering what your advice wod be.!

  •  HGH can help you to grow
    Kyle B (Verified User)

    You should get the Anabolic Stack from Dr Max Powers instead. You can buy online.

    I take this b4 working out and I am stronger. If you have extra money to throw around i highly recommend the Dr Max Powers HGH spray as well. HGH can help you to grow. Everyone knows growth hormone is where it’s at! This isn’t real growth hormone but it’s a natural version of it and it works pretty good. Don’t expect huge gains but expect better sleep and slight growth. If you have extra money laying around get this. If not then get the Anabolic Stack and use it before working out. Thank you!!