A diet product’s worth depends on whether it actually helps people lose weight. Let’s find out if Synedrex really works. We needed to learn as much as possible about the ingredients, side effects, clinical support and customer service. We also took a long, hard look at customer experiences. We processed and condensed to give you the info you need.
What is Synedrex?
First off, Synedrex is a thermogenic supplement supposedly helping to boost metabolism and burn fat. The ingredients are methylxanthine, methylpentane citrate, sulbutiamine, sandalwood extract, yohimbine, alpha lipoic acid and poly-thyronine. The company recommends not taking more than two capsules per day. The small container means there’s no trouble taking them on the go.
The company behind Synedrex, Metabolic Nutrition, started business online in 1997. Trusted retailers and the official website sell the supplement. We like that the ingredients are available for the dieter and that we found some positive comments, but read on…
I think I may need to get a little more used to it before I can use it as a pre work out.
Side Effects – “Do You Need to Worry?”
The first negative we found was with Synedrex side effects. “No dieter wants to feel shaky and jittery after taking a product,” says our Research Editor. “You can have increased energy and metabolism without the problems.”
As one dieter puts it, “The side effects while on it included excessive sweating, jitters and insomnia.”
Another user reports even more Synedrex side effects, ”It gave good energy, but it was too much. It made my heart feel racy.”
During our research, we did stumble on a few dieters who didn’t have the same problem. One said, “The first day I started I got incredibly hot and enough energy to last a week, had a little trouble sleeping but by day 2 that pretty much went away.”
A customer shared, “I haven’t had any of the side effects listed in any of these reviews.”
Scroll below for one of the best products we’ve seen over the last year.
Ineffective – “Frequent Complaint”
Probably one of the biggest issues with a weight-loss supplement like this is effectiveness. According to some, Synedrex ingredients do nothing to help you lose. “II didn’t lose any weight. I will look for a better fat burner,” a user reports.
Another dieter with the same problem says, ”There was no change in my weight at all.”
We did read some supportive comments along the way. As one user said, “Keeps me going. Makes me sweat.”
Another commented, “I only take one pill per day, in the morning and feel it helps sustain my energy all day.”
You only need one negative, like a negative reaction, to ruin your chance of long-term weight-loss success. In the case of Synedrex, if the side effects are as harsh as dieters report, that’s a bad sign.
The Science – “Is There Proof?”
We visited the Science Center portion of the Metabolic Nutrition website to see if there was any support for the weight-loss product. We found articles about supplements and exercise, but no research. The most important parts are caffeine and yohimbe, two stimulants. We know these ingredients boost energy and promote a stronger metabolism, but too much can do more harm than good. Based on the side effects there may be too much in Synedrex. At DietSpotlight, we need proven facts to support claims. If there’s none out there, or if the formula may cause issues, that’s not a good sign.
Also: read our Leptigen Weight-Loss Kit review »
The Bottom Line – Does Synedrex Work?
So, will Synedrex help you lose weight? The business has been around for 20 years and some dieters do report positive results, but we feel uncomfortable giving our support because of the lack of clinical support. Plus, it bothers us that dieters reported side effects and lack of results.
If the time has come to shed off the extra weight, our suggestion is to find a supplement that contains clinically supported ingredients, with no known side effects offered at a price you can afford.
Among the best products we’ve found in 2016 is one called Leptigen. The ingredients are a proprietary blend with published scientific research to spur metabolism and boost fat loss. Dieter’s aren’t talking about negative side effects and users report seeing great results.
Also, the company that makes Leptigen is so confident in the formula they’re offering a Special Trial Offer, which we like.
Previous Synedrex Review (Updated July 9, 2014):
What You Should Know
Synedrex is a pill form diet supplement that is advertised to help dieters shed fat and water weight by controlling food cravings. This diet pill is also supposed to give dieters an endless supply of energy, block carbohydrates and help to curb food cravings.
Synedrex is manufactured and marketed by the company Metabolic Nutrition. The company unfortunately has an unpleasing BBB rating
. Looking at the ingredients one can see that there are some fat burners on the list; both green tea and garcinia cambogia are well known fat burners that have been shown in some studies to produce results. There does seem to be some disparity among websites that claim this product does not work as well due to insufficient amounts of these fat burners.
List of Ingredients
Chromium, caffeine anhydrous, green tea extract, garcinia cambogia, l-tyrosine, l-carnitine, HPMC, cocoa extract, 5-HTP, and jojoba bean.
Synedrex is a diet pill that is advertised to give energy, block carbohydrates, raise metabolism and help dieters to lose extra pounds. Identical claims are made by Plexus Block
. Dieters are instructed to take one or two capsules twice daily. On average the product carries a hefty price tag of $50 or more for a bottle of 90 capsules. If an individual two capsules twice daily as the label suggests the 90 capsules will last less than a month.
See Our Featured
- Synedrex does have added vitamins and minerals in addition to the fat burning ingredients.
- The website has nutritional information and other diet related information as well as supplements.
- The website also contains customer reviews and testimonials.
- Synedrex contains copious amounts of caffeine with over 350 mg per dose. This large amount has been known to cause serious jitters, agitation and dehydration when taken over time.
- At over $50 per bottle on average, this is one of the more expensive diet pills on the market.
- There is no real diet plan or exercise plan included on their official site, just the pills to be taken along with a health and fitness plan of the dieter’s choosing.
- Once dieters stop taking the pills, there is the chance that weight could return since there was not a learned modification to eating and lifestyle habits.
Synedrex does have many customer reviews and seems to help some dieters to achieve results. It is suggested, as with all diet pills, that users follow a sensible eating and exercise plan to achieve the best results. Overall this looks to be an average diet pill with a very large amount of caffeine in addition to other energy substances. Synedrex is almost like an energy drink in pill form and as such will pose the risks of the same side effects such as agitation, jitters and insomnia as well as dehydration. Read up on Synedrex Side Effects
. Similar side effects are often reported with uncertain doses of stimulants like with Adaptogen
or Absolute Nutrition Garcinia Cambogia
. While the product may provide results it is important to remember that there are much less expensive ways to get caffeine.
Synedrex Questions & Answers:
We refined hundreds of customer comments about Synedrex into this helpful FAQ.
What are the side effects of Synedrex?
Potential Synedrex side effects may include nausea, increased blood pressure and jitters, according to some customer reviews.
What is in Synedrex?
Synedrex ingredients are methylxanthine, sulbutiamine, sandalwood extract, yohimbine, alpha lipoic acid, poly-thyronine, chromium, B-vitamins, dipotassium phosphate, silicon dioxide, magnesium stearate, titanium dioxide, gelatin and FD&C blue #1 and green #40.
What are the active ingredient in Synedrex?
The active ingredient in Synedrex are methylxanthine, sulbutiamine, sandalwood extract, yohimbine, alpha lipoic acid, poly-thyronine and chromium.
Does Synedrex work?
There’s no scientific research proving the effectiveness of Synedrex. There are studies linking chromium to weight-loss, but this ingredient is common and can be found online for less than $5.
How much does a bottle of Synedrex cost?
A bottle of Synedrex costs $54.99.
What is Synedrex’s BBB rating?
The BBB rating for Metabolic Nutrition, the company behind Synedrex, is a concerning “C”.
How do you take Synedrex?
You take one or two Synedrex capsules per day. The website recommends not taking two pills within 15 hours of each other and not taking prior to sleep. A bottle lasts between 22 and 45 days.
Can I take Synedrex if I have a health condition?
Women who are pregnant/nursing, those taking prescriptions medications of any kind, people under 18 years of age or people with health conditions should contact a physician prior to beginning any weight-loss program or diet supplement, including Synedrex.
What do users like about Synedrex?
Some users like that Synedrex increases energy above their normal levels. Customers also approve of the cost and the fact that you can use the supplement on the go.
What do users NOT like about Synedrex?
Dieters do not like the idea of side effects with a Synedrex. There are also comments about poor customer service quality and short 30-day return policy.
Who makes Synedrex?
Metabolic Nutrition makes Synedrex.
How do I contact the Synedrex customer service department?
You can contact the Synedrex customer service department by calling 1-954-533-9256, using the customer feedback form on the official website or sending correspondence to Metabolic Nutrition 10318 NW 55th St Sunrise, FL, 33351.
Can I contact Synedrex through social media?
Yes, you can contact Synedrex through Facebook and Twitter.
Is Synedrex for men and women?
Both men and women can use Synedrex. The ingredients don’t address specific gender needs.
Do you need to “cycle” off of Synedrex?
You don’t need to “cycle” off of Synedrex. The website recommends stopping use for two weeks after using it for 12 weeks, however.
Do I need to exercise with Synedrex?
You don’t need to exercise with Synedrex, but the company states optimal results occur when you combine with diet and a fitness plan.
Is there a guarantee with Synedrex?
Synedrex offers a 30-day money-back guarantee.
Synedrex Side Effects:
In the world of weight-loss supplements, even natural solutions may not be completely free of side effects. It’s possible to experience a negative reaction to any type of formula. Though Synedrex side effects don’t happen in all users, they do exist for some.
When you feel unsteady, weak, woozy or even faint, it may be a dizzy spell. Dizziness might also be called vertigo and makes it seem like the things surrounding you are spinning.
What causes dizziness?
Dizziness is a symptom of many health issues and a side effect of some medications and supplements. It may be cause by simply standing too fast or something much more serious. Many people associate dizziness with overconsumption of alcohol, migraine headaches and specific medications.
Racing Heart Rate
If your heart feels like it may explode out of your chest or it’s beating very fast, it’s a racing heart rate. This is also known as tachycardia. While a racing heart rate isn’t always serious, sometimes it can be a problem requiring medical attention.
What causes a racing heart rate?
A racing heart rate may be caused by a serious heart condition, poor blood supply to the heart or even emotional stress. It may be a sign of an infection or a heart valve problem. It may also be caused by drug or alcohol abuse or even over use of caffeine. 
A discomfort felt in the abdomen making you feel like you may vomit is known as nausea. It’s a queasy feeling and causes a large amount of discomfort.
What causes nausea?
Nausea may be caused by many different things from something you’ve ingested to a physical injury or even from many different diseases.  Medications and supplements may cause nausea if your body is having a negative reaction. It may also be caused by head injuries, such as a concussion.
The jitters are an uneasy feeling of nervousness or irregular movement. You may feel very unsteady or incredibly anxious.
What causes the jitters?
While the jitters may be caused by anxiety or stress, they may also be caused by ingesting too much caffeine. Certain medications and supplements may also cause the jitters.
Synedrex side effects are not common in all users, but some have reported dizziness, a racing heart rate, nausea and jitters, among others. Make sure you protect yourself by consulting with your doctor before taking any weight-loss supplement, especially if you’re pregnant, nursing, suffer from a medical condition, are taking prescription medication or you’re under 18 years of age.
Syndrex is a thermogenic that’s supposed to increase heat production and thus boost weight-loss. Though side effects aren’t shown to happen often, these are what some users have experienced.
“I was already feeling horrible heat flashes to cold flashes to dizziness and spinning like being drunk and jittery to a sickening point…I went home and by 3 in the afternoon I was puking.” Sarah
“I have had a dull headache, I feel off balance,i dont feel like my mind is clear, it’s crazy.” Pamala
“My heart pounds like crazy even pulsates hard in my neck. I’ve vomited. I’ve had diarrhea.” Dawn
“I felt nausea, jitters, sweats, chills and threw up and couldn’t settle down all day and night…I felt heart palpitations and increased blood pressure and I didn’t even exercise! I didn’t have an appetite because I was so nauseous.” Andrea
“Horrible jitters, and for hours I had severe nausea. The only reason I didn’t vomit was because I didn’t eat anything and stayed very still while taking deep breaths when the urge would hit me. No sleep last night, despite bedtime being 12 hours after I took the ONE pill. Now, the next day, I’m still jittery.” Jennifer
“…I started to vomit like there’s no tomorrow…in less than 3 hours of me taking the pill. My heart is pumping so fast I am having hard time breathing.” Kathy
“…before even beginning my workout routine, my heart rate spiked from a resting rate of 60bpm to 205bpm in about 30 seconds. It lasted for about 30 minutes, before it slowed back to 60bpm.” Mike
“I became dizzy unable to breathe normally my heart was beating so fast it didn’t feel like it was beating at all!! I was sweaty then hot and all my extremities were cold clammy and I felt very panicky.” Shelley
“I became dizzy unable to breathe normally my heart was beating so fast it didn’t feel like it was beating at all!! I was sweaty then hot and all my extremities were cold clammy and I felt very panicky.” Maria
“…the first day I had no appetite just tons of energy. The second day I was nauseated all day…After 7 days I couldn’t take the nausea anymore so I quit taking them. I was constantly nauseated for an entire week without the pills” Corrina
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Synedrex is a "Powerful Stimulant" that claims it can boost metabolism, cut fat and even smooth out lines. There is a Science Center, but we didn't find any compelling science or research of any kind. The fact that caffeine is a big part of the formula is clear, but you're not told just how much is included.
Synedrex Ingredients and Supplement Facts
Serving Size: 1 Capsule
Serving Per Container: 45
|Amount per Serving
|- Methylpentane Citrate
|- Sandalwood Extract
|- Yohimbine Extract
|- Alpha Lipoic Acid
Other Ingredients: Dipotassium phosphate, microcrystalline methyl cellulose, silicone dioxide, magnesium stearate, titanium dioxide, gelatin
We researched Synedrex ingredients in order to give you the information you need.
Methylxanthine, also known as xanthine, is a chemical found naturally in body tissues and fluids.
What Is It Supposed To Do?
The main purpose of methylxanthine is increasing alertness in the nervous system, although it may also help asthma.
According to a study published in Canadian Journal of Applied Physiology, “The effects of ephedrine, in conjunction with methylxanthines and aspirin, in humans appear unequivocal but include various cardiovascular side effects. None of these compounds have been tested for their effectiveness or safety over prolonged periods of time.”
You may want to try Leptigen, which has clinically tested ingredients.
Sulbutiamine is a chemical containing two thiamine molecules. It is thought to be found in the brain.
What Is It Supposed To Do?
Not to be confused with sibutramine, an appetite suppressant, sulbutiamine is a compound used for memory, fatigue, and the health of the nervous system.
According to information published by the American Society of Health System Pharmacists, “Although thiamine has not been shown by well-controlled trials to have any therapeutic value, the drug has been used for the management of poor appetite, ulcerative colitis, chronic diarrhea, other GI disorders, and the cerebella syndrome.”
Also known as East Indian sandalwood, the sandalwood tree, where the sandalwood extract is derived from, is not easy to grow due to the specific conditions it needs for proper cultivation.
What Is It Supposed To Do?
Sandalwood extract is used traditionally for aromatherapy, spiritual use, and commercially for perfumes.
In a study published Phytotherapy Research, researchers concluded about sandalwood extract that, “However, until further studies are conducted to determine safety regarding internal use, this herb warrants caution with use.”
Yohimbe is a tree found in Africa. The bark is used to make medicines.
What Is It Supposed To Do?
Yohimbe has been used for a wide variety of treatment, including erectile dysfunction, depression, athletic performance, weight-loss, high blood pressure, and much more.
In a study published in Research in Sports Medicine, researchers studied the effects of yohimbe on athletes. In conclusion, “Nonetheless, yohimbine supplementation appears to be suitable as a fat loss strategy in elite athletes.” This does not hold promising results for those who are not at this level of exercise.
Is There Anything Out There That TRULY Works?
Before you give up on weight-loss, we suggest you try the Special Trial Offer from Leptigen. They have clinically-tested ingredients and consistently positive customer reviews. Click here to try out the supplement.