Musclewerks D-Fine8

Updated May 23, 2019.
Published Apr 2, 2019.

Musclewerks D-Fine 8 is a powdered supplement that claims to boost your energy, burn fat, suppresses appetite, and increase metabolism. It is available in 18 flavours so you have plenty of choices, but is this pre-workout supplement any better than any other energy drink? Let’s find out.


  • May have a stimulant effect
  • Wide choice of flavours


  • Use in competitive sport and it could get you banned for doping
  • Inadequate ingredients profile
  • May cause side effects
Musclewerks D-Fine8
Musclewerks Inc is a US company. According to the “about us” information, the company specialises in products that taste amazing and contain the highest quality ingredients. Musclewerks Inc does not provide an address beyond a PO Box in Newport Beach California, but you can contact the company via email.

Musclewerks D-Fine8 Overview

What you need to know about Musclewerks D-Fine8

Musclewerks D-Fine 8 is a pre-workout supplement in a powdered form that you use to make an energy drink by mixing half a teaspoon sized scoop of powder to water. There are 18 flavours to choose from and the product packaging has recently been updated. The version here is the new version which is packaged in a plain blue container bearing the Musclewerks logo.

D-Fine 8 is strong in stimulants, with caffeine the principle component and although you may notice an energy buzz from this, it is extremely expensive for a caffeine supplement. Worryingly, other ingredients include Higenamine and Citrus Aurantium in unknown quantities so if you take part in competitive sport, this supplement could get you banned for doping. You should avoid if you have any medical issues, especially concerning heart or blood pressure.

What are the side effects of Musclewerks D-Fine8?

Musclewerks D-Fine 8 may cause side effects. Many of these are related to stimulants and include jitteriness, anxiety, insomnia, increased heart rate, palpitations, increased blood pressure levels, vomiting, nausea, loss of appetite, heartburn, dizziness, and mood swings.

Dandelion extract is a diuretic, so increases the amount you urinate.

Speak to your physician before using if you have an underlying condition, especially if it is related to heart or blood pressure or is a mental health issue. This supplement may cause interactions with prescription medication, so seek trained medical advice before use.

How much does Musclewerks D-Fine8 cost?

Musclewerks D-Fine 8 is expensive. Buy from the official Musclewerks Inc website and it costs $54.99 for a tub which contains 60 x 1 scoop servings. You are advised that you can take 4 scoops a day making this only 15 days supply.

You can also buy from Musclewerks via Amazon where it costs $55.99 per tub.

Musclewerks D-Fine 8 is also on sale from independent retailers and eBay, so you may be able to shop around for the price. The older versions of this supplement are packaged in containers displaying a picture of the various flavours and are usually around $10 cheaper than this newest version.

WATCHDOG TIP: Consider using the Editor's #1 rated appetite suppressant – CLICK HERE

Musclewerks D-Fine8 Key Features

D-Fine 8 is a pre-workout supplement. It is in powdered form so to use you just add to water, mix, and drink and according to the advertising, this will help you enhance your energy levels, reduce appetite, and generally get more out of your workout.

Musclewerks D-Fine8 Key Points

  • Each tub contains 60 servings – 15 days supply
  • 18 flavours: Bada Bing Cherry, Electric Unicorn, Watermelon, Watermelonade, Fresh Strawberry, Grapeade, Hawaiian Punch, Juicy Grape, Mango Orange, Peach Mango, Pina Colada, Pineapple, Pineapple Mango, Pink Lemonade, Sour Apple, Strawberry Mango, Strawberryade, and Tropical Mango
  • 30-day money-back guarantee advertised

The supplement has a wide choice of flavours. There are 18 in total and we get that Bada Bing Cherry probably tastes of cherry and Hawaiian punch is probably fruity, but Electric Unicorn? In fairness, this is the only really weird name; most of the flavours are fairly descriptive and include Mango Orange, Pink Lemonade, and Strawberryade.

All the flavours look to be very sweet. There was a sugar-free version of this supplement called Musclewerks D-Fine8 Zero, but this seems to be no longer available.

How to Take Musclewerks D-Fine8

  • Take 1 – 2 scoops in the morning and 1-2 scoops 5 hours later
  • Mix with 8-12floz of water
  • Do not exceed 5 scoops in 24 hours

D-Fine 8 contains an energy blend composed of different forms of caffeine. But the bulk of the supplement is provided by 2000mg of the Focus and Thermo Blend. This contains a blend of ingredients in unknown quantities, including Green Tea extract, N Acetyl Tyrosine, Dandelion Root extract, Nandina, and Citrus Aurantium. Some of these are known for side effects, so it would have been useful to know the precise quantities in order to assess strength.

Check out the ingredients tab and the side effects tab to find out more.

Musclewerks D-Fine8 may be smaller than you think. The tub is only 3.75 (9.5cm) inches high and the 2.35g serving size is equal to about half a teaspoon, although it does come with a measuring scoop.

Musclewerks D-Fine8 Concerns

  • No details about how to claim the 30-day money-back guarantee
  • Insufficient ingredients information
  • Expensive

Musclewerks is a US based company. The only physical address we can find is a PO Box in Newport Beach California. However, you can contact the company via email.

Musclewerks supplements are on sale via the official website, and it is also available on Amazon and eBay. The company also uses affiliate selling (where you advertise a product and get paid when somebody buys something via your link). Musclewerks is also looking for retailers, and you can buy supplements from many independent retailers including the Vitamin Shoppe and Elite Supps.

What does Musclewerks D-Fine8 claim to do?

According to the advertising,

“DeFine8 by Musclewerks will give you an edge on your weight loss & fat burning goals. It is trusted, used and recommended by many fitness professionals as well as individuals who love to take it for the lasting (no crash) energy that it gives off.”

“This time tested formula supports appetite suppression, increased metabolism and increased energy levels without the jitters or the crash.”

The key features:

  • The Original Fat Burning & Weight Loss Powdered Thermogenic
  • Delicious, Best Tasting, Amazing Flavors
  • Burn Fat, Lose Weight, Appetite Suppression, Increased Metabolism
  • Instantized Technology for fast dissolving and absorption
  • 100% Satisfaction Guaranteed. – Don’t like it? Send it back. At Musclewerks we understand that supplements have a different effect on different people, and we stand behind our best-in-class products with 30 day money back guarantee

Does Musclewerks D-Fine8 work?

The advertising claims this supplement is trusted, used, and recommended by fitness professionals. This sounds impressive but if professionals really used this supplement, it would get them banned for doping because it contains a stimulant called Higenamine banned by WADA, and also Citrus Aurantium which is banned by the National Collegiate Athletic Association (NCAA).

D-Fine 8 contains a blend of caffeine, including caffeine anhydrous which is a strong crystallised form of caffeine that can be up to 28 times stronger than ordinary caffeine. This combined with the other stimulants may lead to increased heart rate and blood pressure.

In our opinion, Musclewerks D-Fine 8 is going to have a strong stimulant effect and if you feel wired and jittery, you will probably not feel hungry. However, this supplement does not look at all safe and could be dangerous for many users.

phentatrim bottle
The most popular appetite suppressant in 2021 is Phentatrim.

Its ingredients are scientifically proven to aid weight loss and you are covered by a full 60-day money-back guarantee from a trusted company, making Phentatrim a very popular choice in the diet world.

Phentatrim is the best thing to hit the supplement market in a long time, with thousands of customers already seeing the benefits. That’s why it's our editor's top pick.

Read the Watchdog Phentatrim review here.

Musclewerks D-Fine8 Ingredients

Serving size is equal to 1.25 g scoop of powder.

  • Vitamin B6 (1.7mg): Important for brain health and the nervous system, B6 is involved in many processes in the body, mainly concerned with the metabolism of proteins. The RDA is 1.7mg but higher servings are well tolerated.

Energy Blend (150mg):

  • Caffeine Anhydrous: This type of caffeine is often used in supplements and is much stronger that the natural caffeine present in coffee so this will feel much stronger than the 150mg implies.
  • Caffeine Citrate: This is a drug made by combining caffeine anhydrous with citric acid and sodium citrate. It is most commonly used to treat breathing problems in premature babies. When used in supplements like this it may help caffeine enter the bloodstream within 30 minutes – much faster than other forms of caffeine. Source
  • Di-Caffeine Malate: Blend of caffeine and malic acid. It provides the same energy boost as caffeine but may have a calming effect upon the digestive system.

Focus and Thermo Blend (2000mg):

  • N Acetyl L Tyrosine: Soluble form of L Tyrosine, an amino acid, which you can obtain through diet if you eat meat and cheese. In supplement form, it is believed to help training and is popular with bodybuilders for this reason. It is believed to stimulate brain chemicals serotonin and dopamine and is sometimes taken to treat depression. Research suggests that taking 150mg will improve alertness after missing a night’s sleep for around three hours
  • Citrate: Acid compound found in citrus fruits and important for the metabolism. Citrate may help reduce acidity in urine.
  • Green Tea Extract: Clinical research has found that green tea has proven health benefits, and the antioxidants (ECGC epigallocatechin-3-gallate and polyphenols) found to have anti-obesity and fat burning properties because of the effects upon the metabolism. Clinical research suggests it combines well with caffeine. Source
  • Nandina Domestica Extract: Better known as Heavenly or Sacred Bamboo and a popular garden plant, Nandina contains a natural chemical called Higenamine which is a stimulant that increases heart rate and muscle contractions. Higenamine is banned by the World Doping Agency. Source
  • Dandelion Root Extract: Well known garden weed and a natural diuretic. So it will increase urination.
  • Cocoa Extract from Theobroma Cocoa: Latin name for the cocoa tree. The source of chocolate! Cocoa can have health benefits. It helps widen arteries so may help reduce blood pressure.
  • Taurine: Best known as an ingredient of energy drinks like Red Bull, Taurine is present in the body in brain, eyes, blood, and heart, as well as derived from dietary protein, especially red meat and fish. It has benefits to heart health and may improve endurance.
  • 6 Paradol: Flavanoid present in ginger and grains of paradise. Testing on animals identified it as a powerful antioxidant.
  • Citrus Aurantium Extract: Citrus Aurantium contains a chemical called synephrine which has been proven to increase the metabolism and so may aid weight loss. However, there are numerous concerns about its safety especially as it increases heart rate and blood pressure if taken in high amounts. Source

Other ingredients: Natural and Artificial flavours, Silicon Dioxide, Sucralose.

Musclewerks D-Fine8 Side Effects

Musclewerks D-Fine 8 may cause side effects. Many of these are related to stimulants and include:

  • Jitteriness
  • Anxiety
  • Insomnia
  • Increased heart rate
  • Palpitations
  • Increased blood pressure levels
  • Vomiting
  • Nausea
  • Loss of appetite
  • Heartburn
  • Dizziness
  • Mood swings

Dandelion extract is a diuretic so increases the amount you urinate.

Caution: Not suitable for individuals under 18. Avoid if you are pregnant or breastfeeding. Speak to your physician before use if you are taking prescription medication or have an underlying medical or mental health condition.

Musclewerks D-Fine8 Customer Feedback

We could only find a few customer reviews for Musclewerks D-Fine 8. Although it is sold via Amazon, not many people have reviewed it and none of the feedback tells us very much.

There are three comments left for the Green Apple flavour. All were positive and along the lines of,

Gives me the pep I need for a great workout!

There were more customer reviews for the Watermelon flavour,

This stuff is pretty good but getting way over priced. It was expensive before but now it’s even more expensive. The price needs to be significant reduced for me to buy it again

Love this stuff. I drink it before and during spin classes. So yummy…

Not everyone is satisfied

Got nothing from it. Even had friends try it and they got nothing. Save your money

Musclewerks D-Fine8 Money-Back Guarantee

According to the Amazon advertising, you are covered by a 30-day money-back guarantee. If you are dissatisfied, you should contact Musclewerks Inc to find how to claim this. We have been unable to find anyone who has successfully claimed this money back refund.

Where To Buy Musclewerks D-Fine8

You can buy Musclewerks D-Fine 8 from the official Musclewerks Inc website. It is also available via Amazon, on eBay, or on sale from other independent retailers such as the Vitamin Shoppe. Many affiliate marketers are using Facebook as a market place. Click on one of these and you will be taken to the Musclewerks website to buy.

Watchdog Verdict

Musclewerks D-Fine 8 seems overpriced. It is important to remember that although the tub looks big in the advertising, serving size is only around half a teaspoon and the total size of the container is only 3.75 inches tall. We can imagine that some customers will be disappointed when they receive their product through the mail and in all truth, it does not look like much for $55.00.

In addition, this supplement will not last very long. Although the advertising states it contains 60 servings, you are advised to take up to 4 (or even 5) servings a day so we think that for just 15 days supply Musclewerks D-Fine 8 is extremely pricy.

Finally, there is no proof that any professional sports people have ever taken this supplement. If they did, it could see them fail a doping test as it contains Higenamine which is banned by WADA and Citrus Aurantium, banned by the NCCA.

In our opinion, this supplement will work in much the same way as an ordinary energy drink with the added disadvantages of an increased risk of side effects, disqualification from sports, and all at much more cost.

We don’t recommend Musclewerks D-Fine 8 to the Watchdog readers.

How does Musclewerks D-Fine8 compare to Phentatrim?

Criteria Musclewerks D-Fine8 Comparison Phentatrim comparison
Clinically Proven Ingredients
Side Effect Free
Positive Customer Reviews
24/7 Support
Money-back Guarantee

Disclaimer: Our reviews and investigations are based on extensive research from the information publicly available to us and consumers at the time of first publishing the post. Information is based on our personal opinion and whilst we endeavour to ensure information is up-to-date, manufacturers do from time to time change their products and future research may disagree with our findings. If you feel any of the information is inaccurate, please contact us and we will review the information provided.

Have Your Say

Get the conversation started by leaving your comments using the form above.

Add your comment

We'd love to get your opinion. Please keep it clean and stay on topic, no spamming. Comments are moderated before being made live. Your email address will not be published.
We cannot give advice about medical conditions or prescription drugs. Please direct specific medical questions to your doctor.

This site uses Akismet to reduce spam. Learn how your comment data is processed.