Cellucor D4 Thermal Shock

D4 Thermal Shock is an energy boosting diet supplement from a company called Cellucor. Cellucor boast that this product provides high energy levels and results from one capsule, without leading to jitteriness or a crash in energy levels later in the day. It seems to be formulated for people who regularly exercise.

D4 Thermal Shock Pros

  • Huge boost in energy
  • 30-day money-back guarantee

D4 Thermal Shock Cons

  • Mixed reviews
  • Huge number of reported side effects
  • May be too strong for many
Watchdog Rejected Diet Pills
D4 Thermal Shock

Cellucor D4 Thermal Shock Review

D4 Thermal Shock Facts

  • Manufactured by Cellucor
  • Available in 60 or 120 capsules per bottle
  • Energy boosting diet pill

With the main effect of taking D4 Thermal Shock being an increase in energy levels, this diet pill is probably best suited for those who are undertaking large amounts of exercise as a part of their weight loss efforts. More energy allows consumers to work harder for longer, burning more calories.

However, it may not be a suitable product for any athletes who want to compete in sports run by individual sports organisations. Cellucor state on their website that some of the dietary ingredients, whilst being legal in general, may be prohibited by individual sporting organisations. Athletes, both amateur and professional, should check with their sporting organisation before consuming Cellucor D4 Thermal Shock. There is also a huge list of restrictions for who should not take this product, because of health concerns. These are listed on the product website and we have listed the restrictions below in the possible side effects section.

How to Take Cellucor D4 Thermal Shock

Take for a maximum of 8 weeks before having a break of 4 weeks minimum. Consume plenty of water throughout the day. Take one capsule in the morning. If desired, take a second capsule in the mid-afternoon, at least 6 hours after the first dose. Never exceed 2 capsules per day.

Whilst D4 Thermal Shock can be taken on an empty stomach, users should start by taking the capsule with a meal, as this slows down the absorption of the capsule into the blood stream, and will minimise the chances of stomach ache, sickness and jitteriness. Customers who can tolerate high levels of stimulants can take it on an empty stomach. They can also take 2 capsules in the morning instead of spread over the day, although to start with customers should always start with one capsule to assess their personal tolerance to the diet pill.

Cellucor are an;

award winning industry leader committed to premium products, innovation, and most importantly, your results.

They have been voted the GNC sports nutrition vendor of the year for 2013, and 2012, as well as being awarded several other awards. They can be contacted through live chat on their website, or by calling 866.927.9686 between 8am and 6pm CST Monday to Friday. Their customer service email address or they can be contacted via twitter handle @cellucor.

They are based in Texas, at 3891 S. Traditions Drive, Bryan 77807.

Cellucor D4 Thermal Shock Concerns:

  • Athletes may not be able to take the product and compete
  • High incidence of side effects

What Does Cellucor D4 Thermal Shock Claim To Do?

Cellucor D4 Thermal Shock is a diet pill that primarily promotes its energy boosting ability. Its fat burning ability is mentioned almost as an afterthought.

Cellucor writes that the product;

Delivers a surge of electrifying energy and focus to accelerate weight loss.

They also mention the following list of qualities:

  • Fat Loss and Explosive Energy
  • Unparalleled Adrenaline
  • No ‘Crash’
  • Simple One Pill Dose
  • Ultra Concentrated Formula

So What Is Cellucor D4 Thermal Shock and What Are The Ingredients?

There is 588 mg of the proprietary formula per serving of 1 capsule. Individual ingredient amounts are not released.

  • Amla fruit extract: Amla is a fruit used in traditional Indian medicine as a laxative, as well as other uses. It is also said to improve general health.
  • Caffeine: Numerous studies have shown that caffeine boosts energy levels and alertness, as well as mildly boosting the metabolism, causing a small increase in the number of calories used by the body. The effects shown in studies are small, and some studies are inconclusive.
  • White Willow Bark Extract: Willow bark contains salicin, which acts a painkiller, and is thought to be as effective as aspirin. There is some evidence that when taken in conjunction with kola nut and ephedra, it can cause weight loss. It does not seem to have been tested on its own for weight loss properties.
  • Octopamine HLC: This is similar in its chemical structure to norepinephrine, and so some think that Octopamine HLC will cause an increase in heart rate, increased metabolic rate, and a better release of glucose for energy use. Octopamine is one of the compounds found in bitter orange extract.
  • Sclareolide: Bodybuildingdescribed Sclareolide as an extract from clary sage that may help to boost energy levels. It increases ATP conversion to cAMP, an intracellular messenger that accelerates several cellular processes including lipid metabolism and thyroid production.
  • Yohimbe Bark Extract: Some studies have noticed increased blood concentrations of free fatty acids in participants who use Yohimbe extract, suggesting increased rates of lipolysis. However, the Natural Medicines Comprehensive Database has stated that there is insufficient evidence to claim it aids in weight loss.
  • Evodiamine: Bodybuilding describe Evodiamine as a plant extract that may boost the metabolism and provide an energy boost. It is also a mild diuretic.
  • Passion flower extract: This is used traditionally to aid relaxation and to reduce anxiety, as well as to aid sleep. It also may relax muscles, which may speed recovery or reduce pain following exercise.
    Source:WebMD Resource
  • N-Acetyl-L-Tyrosine: An amino acid that is a building block of protein, this ingredient is found naturally in many foods including meat and dairy products. Some people use it as an appetite suppressant, but there is little evidence that it is effective for this use. Large doses of tyrosine may be useful for increasing alertness, especially in people who are sleep deprived.
    Source:WebMD resource

So What Does All This Mean?

There is a large amount of caffeine in D4 Thermal Shock, which means that customers should avoid caffeine from other sources, to minimise the chances of side effects. There are many ingredients in D4 Thermal shock that are primarily energy boosting, although they will also cause a boost to the metabolism.

Yohimbe may increase lipolysis, and caffeine increases fat oxidation, so the body’s fat burning capabilities will be increased whilst using this product. There are also laxative and diuretic ingredients in this diet pill; customers should ensure they are drinking plenty of water to avoid dehydration.

Does Cellucor D4 Thermal Shock Have Any Side Effects?

Side effects associated with caffeine include headaches, increased urination, jitteriness, dehydration, increased blood pressure, heart palpitations and problems sleeping. Customers should limit their caffeine intake from other sources to minimise the chances of side effects. D4 Thermal Shock should not be taken in the evening, as it would interfere with sleep.

Yohimbe has been linked with irregular or rapid heartbeat, kidney failure, seizure, and heart attack in rare cases. More common side effects include stomach upset, tremor, sleep problems, anxiety or agitation, high blood pressure, a racing heartbeat, dizziness, stomach problems, drooling, sinus pain, irritability, headache, frequent urination, bloating, rash, nausea, and vomiting.

Customers have reported a wide range of side effects from using D4 Thermal Shock. These include:

  • Jitters
  • Headaches
  • Confusion
  • Clouded Vision
  • Feeling faint
  • Nausea
  • A drunk like feeling
  • Increased sweating
  • Crash in energy levels
  • Feelings of unease and anxiety
  • Insomnia


This product is only intended for use by healthy adults 18 years of age or older.

Do not use if pregnant or nursing.

Consult a doctor before using this product if you are unaware of your current medical condition or if you have been treated for or diagnosed with or have a family history of any medical condition, or if you are using any prescription or over-the-counter medication.

Discontinue use 2 weeks prior to surgery.

Do not use this product if you have any serious medical condition, including but not limited to: high or low blood pressure, diabetes, anxiety, cardiovascular, psychiatric or seizure disorders, heart, liver, kidney or thyroid disease, difficulty urinating due to prostate enlargement or if you are taking an MAOI (Monoamine Oxidase Inhibitor), SSRI, or blood thinner.

This product contains caffeine and should not be used by individuals wishing to eliminate caffeine from their diet. Do not use in combination with caffeine or stimulants from other sources, including but not limited to, coffee, tea, soda and other dietary supplements or medications.

Immediately discontinue use and consult your doctor if you experience any adverse reaction to this product.

Do not exceed recommendations for suggested use. Use only as directed.

Any Cellucor D4 Thermal Shock Reviews From Customers?

There are several reviews of D4 Thermal Shock from customers on the official website. These are all overwhelmingly positive, with all reviews giving the product 5 stars for effectiveness, value and as an overall rating:

I love how you feel a clean energy that is jitter free. 🙂 This product helped fuel my workouts, helped regulate my appetite, and also helped me become the leanest I’ve ever been within weeks.

However, it is mildly suspicious that 6 of the 9 reviews were all left on the same date, 10/31/13. We suspect that these positive reviews have been transferred from another source, whilst any negative reviews were ignored. There are over 180 reviews on the independent site, which seem to cover a wider selection of opinions about the product:

Gives me a lot of energy, didn’t see much difference in the body fat burning.

I don’t feel anything with this product…. It does not give me any extra energy, does not suppress my appetite… nothing…

Best fat burner I’ve ever tried. It really helps with appetite control, and it gave me a ton of energy throughout the day with no crash. It tastes kinda funky though.

Some customers also report side effects:

I feel weak and that I’m going to puke.

The first day I used it I broke out in a huge sweat while sleeping was really uncomfortable and had a horrible head ache but since that first day I haven’t had anything wrong.

Jitters, headache, clouded vision, felt like I was going to pass out & throw up.

One review that caught our attention was written by a 6’2” male, who weighs 227lbs according to his profile on He wrote:

I don’t wanna give it a poor rating ’cause I couldn’t handle it but this thing is TOO strong for me. I love Cellucor products and I’m really disappointed that I couldn’t continue using Thermal Shock. So, what I did was I exchanged it for T7, which I used about a year ago. If you’re sensitive to stimulants, STAY AWAY from D4 Thermal Shock. D4 had me buggin’ the @#%* out!

If someone with that height and weight was unable to use D4 Thermal Shock as the stimulants were too strong, it may be advisable for those who are caffeine and stimulant sensitive to avoid the use of this diet aid, for their own health!

So Does Cellucor D4 Thermal Shock Work?

Many reviews do reiterate that the product works for them in some ways. Most people state that it provides a huge boost in energy. Slightly less reviews are happy with the feeling of appetite suppression they get using the product, and even fewer people notice any fat burning or thermogenic results. Fat burning is obviously the hardest element to gauge accurately, and most people seem to judge this by changes in body temperature and sweating, as well as weight loss results.

What is unusual is that many customers have mentioned how happy they are with the appetite suppressing quality of the diet pill, when Cellucor makes no mention of the product having this quality. It may be that the product does suppress the user’s appetite, or that this is merely a placebo effect.

Where Can I Buy Cellucor D4 Thermal Shock?

Cellucor D4 Thermal Shock can be bought from the official Cellucor website. The bottles come in two sizes. 60 capsules sell for $59.99, whilst 120 capsules is sold for $99.99.

It can also be purchased from both; Here 60 capsules cost $39.99 and 120 capsules cos $69.99.

What About A Guarantee

Cellucor offer a 30 day 100% full money back guarantee on products from their website.

Watchdog Verdict

Whilst Cellucor D4 Thermal Shock seems to be an incredibly strong energy booster, customer reviews suggest that its fat burning capabilities are not quite as noticeable. Assessing fat burning can be difficult, but as many customers saw significant weight loss when used to support regular intense exercise, it is reasonable to state that this diet pill does work.

However, there is a large variety of people who should not use this product because of both its strength and the ingredients used in it. This may include competing athletes, depending upon the sports organisations they are associated with.

The cost of D4 Thermal Shock is quite high, especially from the official website. However, the 100% satisfaction 30 day money back guarantee is a great offer from Cellucor.

The most worrying thing about this product is the huge number of customers who have reported numerous side effects. Whilst some such as headaches are annoying but manageable, side effects such as clouded vision, confusion, nausea, anxiety and faintness are much more worrying, especially as they interfere with a person’s daily lifestyle.

Overall, the risk of serious side effects is too high to recommend D4 Thermal Shock to Diet Pill Watchdog readers. Whilst the product will help frequent exercisers to go the extra mile with their workout, sometimes literally, and it will aid weight loss, the number of customers who would have to stop taking the product because of side effects is too high. No matter how good a product is at aiding weight loss, if a customer cannot use the product, it is a total waste of money.

We reject Cellucor D4 Thermal Shock.

Watchdog Rejected Diet Pills

#1 Consumer Choice 2021: Phentaslim

Phentaslim is Diet Pills Watchdog Approved


Thousands of customers have cut the fat with this fast and powerful thermogenic fat burner. Can suppress appetite, boost energy levels and elevate mood without the jitters.

  • Over 100,000 satisfied customers
  • Manufactured in a GMP facility
  • 60-day money-back guarantee
  • FREE shipping and buy 3 get 1 FREE offers!
See our Full Review here

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.