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FenFast 375 Review - 11 Things You Need to Know

Fenfast 375 – Is it the best of the best fat burner? The makers promise that it is the last diet pill you’ll ever have to buy. This maximum strength dietary supplement improves energy levels and focus while helping you lose weight. Could this be the miracle solution we’ve all been waiting for? Our research team wasn’t convinced. So, we did what we do best: investigate.

Our researchers examined the Fenfast ingredients, studied the available clinical research, and listened to what verified users had to say so that we could give you the bottom line on Fenfast 375.

FenFast 375 can be purchased through their Official Site.

FenFast 375 Readers: Noom is offering our readers a risk-free trial, for a limited time. Click here for more information!

What is Fenfast 375?

Fenfast 375 is a weight loss aid designed to boost your metabolism while giving you the energy you need to live a more active lifestyle. The makers claim it’s an over-the-counter version of the controlled substance Adipex.

Adipex is a controversial prescription diet pill. Adipex is an appetite suppressant with severe side effects, including a rapid heartbeat.

Adipex contains phentermine. The Yonsei Medical Journal compares phentermine to amphetamines. Fortunately, Fenfast 375 does not contain phentermine, but does it mimic the effects of amphetamines?

Why would Intechra Health compare Fenfast to a dangerous diet pill? Our researchers investigated the Fenfast 375 ingredients to find out.

Does Fenfast 375 Work?

  • National Library of Medicine — “The solid-state structure of the amino acid phenylalanine (Phe) offers a potential key to understanding the behavior of a large class of important aromatic compounds.”
  • Journal of the International Society of Sports Nutrition — “Oral intake of phenylalanine caused a significant increase in the concentrations of plasma glycerol and glucagon during exercise.”
  • Committee on Military Nutrition Research —  “[Caffeine] has numerous pharmacological and physiological effects, including cardiovascular, respiratory, renal, and smooth muscle effects, as well as effects on mood, memory, alertness, and physical and cognitive performance.”

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Company Information

How Did Fenfast 375 Start?

Fenfast 375 is manufactured by Intechra Health, a Bellingham, Washington-based nutraceutical company. They are dedicated to providing supplements and promoting wellness through a balanced diet and exercise.

Other products from Intechra Health include:

  • PhenBlue
  • TrimThin x700
  • Apex-3×5
  • 3G Burn
  • VisiPro 20/20

FenFast also offers an affiliate program where individuals can get commission payments.


Fenfast 375 Claims

crowded train station in black and white with the word claims written on top

Intechra Health claims the pill:

  • The top-rated over-the-counter diet pill
  • Powerful “boosters” to promote an active lifestyle
  • Improves focus and cognitive abilities
  • Years of scientific research
  • Quality proprietary blends for maximum effectiveness
  • Supercharge your energy levels

Fenfast 375 Ingredients

  • L-Phenylalanine
  • Caffeine
  • L-Theanine
  • Theobromine


Phenylalanine is an amino acid used by the body to produce chemical messengers. These messengers play a role in energy regulation, motivation, and concentration. There is insufficient evidence regarding phenylalanine and weight loss, and preliminary research shows that phenylalanine does not affect overweight individuals’ hunger.


Evidence suggests caffeine supports weight loss in individuals who are eating a balanced diet and exercising. The Journal of the International Society of Sports Nutrition found that caffeine can increase your resting metabolic rate.

Another study published in Food Science and Biotechnology showed that caffeine stimulates the central nervous system. The central nervous system then sends a signal to fat cells. This process results in the breakdown of fat.

There is one downfall to using caffeine for weight loss. According to a study published in PLOS One, the human body builds up a tolerance to caffeine’s effects.


L-theanine is a unique amino acid found in tea. A study published in the Asia Pacific Journal of Clinical Nutrition found that L-theanine directly affects the human brain. This suggests that L-theanine can affect mental alertness, but more research is needed.

Does it Work?

Does Fenfast 375 Work?

turquoise filled rectangle with the words does it work

There are pros and cons associated with this maximum strength dietary supplement.

Fenfast 375 Pros:

  • Fast-acting formula
  • Positive reviews
  • Groupon coupon available
  • Promotes a healthy lifestyle

Fenfast 375 Cons:

  • Fenfast 375 cost
  • Lack of science to back claims
  • Serious side effects reported
  • No free trial

So, does Fenfast 375 work? As with any dietary supplement, results will vary by user.


Fenfast 375 Benefits and Results

Our researchers pored over thousands of Fenfast 375 reviews. The reviews were mixed. One report said that Fenfast 375 gave them the same burst of energy as Adipex while another report claimed they felt no effects.

The website does say that people who are sensitive to stimulants should not take this product. Everyone who does take Fenfast should be careful not to exceed the recommended dosage.

Weight Loss

Details on Fenfast 375 and Weight Loss

Our research team loves that Intechra Health promotes a healthy diet and regular exercise with their products. If a lack of energy is holding you back from your weight loss goals, this supplement might give you the boost you need. Before you take Fenfast, talk to your doctor about stimulant weight loss aids, and never take more than the recommended dosage of this product.


How to Use Fenfast 375

dark wood desk with two blue binders and one reads instructions

Take two Fenfast 375 capsules twice a day with water. It should be taken a half hour before meals. Do not take this product within 5 hours of your regular bedtime. Fenfast is intended to be used in conjunction with regular exercise and a reduced-calorie diet.

Where to Buy

If you’re wondering where to buy this supplement, it is available on eBay. You can also find it in stores, including Walmart, CVS, GNC, and Walgreens. This product is not available on Amazon. Be sure to check Groupon for a coupon before you shop. The regular Fenfast 375 price is $49.99.

The supplement is also available on the official website.

Side Effects

Potential Fenfast 375 Side Effects

According to the website, people who use this product may experience:

  • Dry mouth
  • Jitters
  • Loss of appetite
  • Increased heart rate
  • Elevated blood pressure
What Users Are Saying

What Users Are Saying

“I am very happy with Fenfast 375. Only thing is the tablets were larger in size then I expected. With a low calorie diet and exercise Fenfast 375 gives you that extra support to not over eat and reduces sugar cravings.”

“This product didn’t help me as they claim it would. I have done everything to lose weight. There was no effects to me. I’m sorry have to try another product.”

“I’ve used this product on and off for about 3 years. It’s the best diet pill I’ve ever used. It doesn’t make me feel sick or it doesn’t make me feel like I’m jacked up on energy pills. It has helped me lose a lot of weight.”

Bottom Line

Bottom Line on Fenfast 375

There is some evidence to support Fenfast 375 as a weight loss aid, but our research team is still concerned about the reports of adverse effects. We can’t help but wonder if there are long-term effects associated with this dietary supplement.

There are products on the market that will help you lose weight without putting your health at risk. With so many products on the market, how do you know which one is right for you? We suggest only using products that have undergone research.

One product we feel confident recommending is Noom. You’ll find what you expect in a weight-loss app via food and exercise tracking, but Noom is about more than that. With human coaching and a personalized weight-loss plan, you have nothing to lose but weight.

The company behind Noom is confident that this product works. They are currently offering a free trial offer.

Learn More About Noom »
FenFast 375 Review
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FenFast 375

Is FenFast 375 for weight loss?

FenFast 375 is a weight loss supplement.

What are the FenFast 375 ingredients?

The ingredients in FenFast 375 are l-phenylalanine, caffeine, theobromine, and l-theanine.

Are there FenFast 375 side effects to know about?

Because the supplement contains a significant amount of caffeine, side effects may include jitters, shakes, nausea, diarrhea or irritability.

Did you find any FenFast 375 product warnings?

Supplements are not tested on men or women under the age of 18, so the product is only suggested for healthy adults ages 18 and over.

Is FenFast 375 for men or women?

FenFast 375 is for men and women – there are no ingredients that lean to one side or the other.

Where can I buy FenFast 375?

FenFast 375 can be purchased using their Official Site.

Where can I buy FenFast 375?

Major retailers like Walmart sell FenFast 375 for $40 to $50.

Is there a FenFast 375 free trial or free samples?

We were unable to find any free trials or samples for FenFast 375.

What is the most common FenFast 375 complaint?

A common complaint is feeling jittery after taking FenFast.

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