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Health Guide Review: 3,1/5


FenFast 375 Review: Does it work?

Intro: What is it?

FenFast 375 is a weight loss pill made with a stimulant formula that claims to help people burn upwards of 25 pounds a month. It does this with its reported appetite suppression and 24-hour fat burning effects.

Though it’s a stimulant formula, the company claims this brand is safe and of pharmacological grade. This basically means it’s made using the science of drugs. Is this stimulant formula truly effective and safe to use? What do other customers have to say? In this review is all the information you need to know about FenFast 375.

FenFast 375 Ingredients

Beta Phenylethylamine HCI Caffeine 200 mg Hordenine HCI L-Theanine Dicalcium Phosphate
Microcrystalline Cellulose Stearic Acid Sugar Corn Starch FD&C Blue #1
Croscarmellose Sodium Magnesium Stearate Silicon Dioxide Pharmaceutical Glaze (Shellac and Povidone)

 Beta Phenylethylamine HCI: Chemical found in the body that’s also made in a laboratory. It has stimulant and brain changing properties that are similar to amphetamines. Taking too much of it can have strong amphetamine like effects. It can also cause side effects that include:

  • Rapid heart rate.
  • Anxiety.
  • Agitation.

When supplemented, this ingredient is often not properly processed in the body. mentions that there’s:

“limited supplemental usage due to being rapidly broken down into inactive components”

Therefore, it’s likely to have no effect at all.

Caffeine: There’s approximately 2 cups of caffeine’s worth of coffee in one serving. This stimulant is added to weight loss formulas since it’s cheap, and known to increase energy. Taking caffeine repeatedly is known to limit its effects to what adds:

“the only benefit a user experiences is caffeine’s anti-sleep effect”

It can also produce several unwanted side effects:

  • Headaches.
  • Rapid heart rate and cardiovascular damage.
  • Anxiety.
  • Tremors, shaking, and seizure.
  • Insomnia, restlessness, and fatigue.

The company recommends 2 servings a day, which equals 400 mg of caffeine. This is the advised daily limit that health organizations have for caffeine. Any more can potentially cause severe side effects.

Caffeine is also not a long-term weight loss solution, since the body produces a quick tolerance.

Hordenine: Extract found in many plants. It’s known to have a stimulant effect. It’s also been shown to raise blood pressure. It’s claimed to be a fat burner, but according to studies, it’s not been shown to produce any weight loss benefits.

It’s also not well documented as to what kind of effect high caffeine and hordenine may have on the body.

L-Theanine: An amino acid found in tea, it’s used to relax the body without causing a sedative effect. When combined with caffeine it’s used to focus attention.

The group who researched this ingredient advises to take only 200 to 250 mg doses per sitting. It’s unknown how much FenFast 375 adds, since they use a mixed proprietary formula.

FenFast 375 Quality Of Ingredients

There’s a heavy amount of stimulants added to this formula. With the majority of ingredients meant to mix together to form an energy increasing, thermogenic, and overall anti-anxiety effect.

However, because there’s 400 mg of caffeine per serving, this alone is enough to cause many side effects in people. Combined with the other stimulant hordenine, and it increases the odds of side effects.

Hordenine hasn’t been studied much in humans, L-Theanine can be found in tea, and the other inactive ingredients include stabilizers, food coloring, and sugar. Overall, the ingredients are either ineffective or potentially dangerous

The Price and Quality of FenFast 375

There are direct sales available from a 6-month supply, to one month.

Their 120-count one-month bottle costs $49. This averages to a daily price of $1.63 per serving.

Though since shipping is an incredibly high $14.89, the price is more like $63.89, with a daily price of $2.12.

This high shipping cost is likely since the company is Canadian; it’s also unknown how much this extends the travel time.

Clinical Studies

The manufacturers provide links to published clinical studies performed on 3 of the active ingredients. They didn’t pay for these studies and that is good, since it removes the possibility for a bias.

There are issues with these studies however:

Hordenine: Both clinical studies provided require a cash payment in order to see them. They’re published on websites where scientists look to get money off their research.

One of the clinical studies talks about weight loss ingredients in general, and it’s unknown if this includes hordenine. The other study is about obesity treatment. Sometimes companies will provide links to studies that actually don’t support their ingredients. Without being able to look at what’s provided, it’s unknown if it has good things to say.

Beta-Phenylethylamine: One study provided didn’t actually talk about this ingredient. Another study showed how it was effective for elevating mood, but no weight loss results were shown. The other 2 studies had major issues as well. The first link is no longer available, and the other was done in combination with another stimulant called synephrine.

No individual studies provided show this ingredient to be effect at promoting weight loss benefits.

Caffeine: 4 studies are featured. One Pub Med study showed that:

potential negative effects of excessive caffeine intake should also be considered

Another study published by the Obesity Journal also showed the following:

We cannot draw firm conclusions”

Therefore, the studies published on caffeine have been flawed either due to side effects or there being not enough data. It’s unknown why the company has decided to provide these studies, since only one out of the studies showed a benefit for the ingredients mentioned.

Still, the other studies were either flawed or they ended with a caution that further testing needs to be performed.

Safety Concerns

For unknown reasons, the company does not list very important details on the official FenFast 375 website. Instead, customers have to go to the official company website to see important facts about this brand.

They mention how you should make sure of the following:

  • Take a serving 2 times a day, with 8 ounces of water.
  • Take it 30 minutes before a meal.
  • Take it alongside diet and exercise.
  • Cannot be used within 5 hours of sleep
  • People with sensitivity to stimulants or with conditions should ask a physician for advice first.

Each of these facts is important to follow, since taking this brand without these considerations can lead to unwanted side effects.

Also, since there’s no money back guarantee, you’re forced to purchase this brand and possibly lose money if you were to experience side effects or a lack of benefits.

They mention that even if a physician were to advise you to stop taking this brand that you’re not allowed a refund. So talking to a physician before considering this supplement is highly advised.

Another problem to consider is with the 400 mg of caffeine. Mayo Clinic adds that this amount is about the same as:

four cups of brewed coffee, 10 cans of cola or two “energy shot” drinks”

This is a lot of caffeine to get in a full day, and it’s the same amount that is provided in a daily serving of FenFast 375. Everyone who takes caffeine will not have the same response, for some this amount can cause harmful side effects. Some of these effects have been listed by customer and they are available for reading in the “Customer Opinions of FenFast 375” section.

Business of FenFast 375

Intechra Health Inc. makes this brand, and they list their contact details as:

Phone Number: (855) 226-9242


As far as a return policy the company adds:


They also add how they even don’t allow returns even in extreme cases, such as a physician recommending one to stop taking their supplements. So for any situation, all sales are final.

The company mentions how they rarely ever have to make returns since most people have a positive reaction. As you’ll see from the next section of customer reviews, this is not the case.

Customer Opinions of FenFast 375

There’s a total of 631 negative customer reviews available on Here’s what the average person has to say:

“much like caffeine pills, but I didn’t notice any appetite suppression”

“Not one pound lost, no energy boost”

“did absolutely nothing for me”

“This does not work…anyone who says it does is having major placebo effects”

The company also hands out free products for a review, which can often cause customers to leave behind biased opinions. Still, there was concern over the stimulant effects by those who saw an energy boost. Many customers failed to lose weight, but they often did experience side effects.

Common symptoms include headaches, nausea, rapid heartbeat, anxiety, jitters, tremors, and flu like side effects.


This stimulant formula has shown the following important points:

  • There are several negative reviews: There are 631 reviews from people who had side effects, no weight loss, and a lack of appetite suppression. Though some did experience increased energy, the vast majority had extreme elevated heart rate and anxiety. Some positive reviews do exist, but since the company gives out free bottles for reviews, some of these positive claims might be skewed. Overall, there were a lot of complaints about this brand producing harsh reactions. Also, no money back return policy is offered for any reason.
  • No money back return is allowed: Under no circumstance is there any money back return offered. Whether it is side effects or a lack of weight loss, you aren’t allowed a return. A money back return should be standard for any weight loss supplement, in order for one to make a secure purchase. Especially when dealing with stimulants, it’s unknown if this product will produce harsh side effects from person to person.
  • It’s full of stimulants: A full dose has 400 mg of caffeine; this means you can’t have any more caffeine from any other source. This is because 400 mg is the maximum recommended daily amount for the average person. Anymore and you risk experiencing extreme side effects. There’s also hordenine added which is another stimulant that can have similar side effects. There weren’t any clinical studies that I found which showed what kind of an effect hordenine and 400 mg of caffeine might have. You’ll often see warnings in scientific studies to be careful of overloading on stimulants.
  • The inactive ingredients include stabilizers, colors and cheap additives: The added blue food coloring is often only used in processed foods. This ingredient only adds color and it has no nutritional value. This has been criticized by organizations that claim that it may cause hyperactivity, DNA damage, and other side effects. The included sugar isn’t featured in any significant amounts, but it’s also an unnecessary ingredient, as weight loss supplements aren’t usually taken to provide a taste.
  • It’s pricy for what you’re getting: When you break down the formula you’ll see it’s not priced fairly. You get L-Theanine, which is not for weight loss and it’s found in cheap tea. There’s Beta-Phenylethylamine, which is not processed by the body well. Then there’s the added caffeine that is extremely high and potentially side effect causing. Finally, there’s hordenine, which isn’t well researched on humans. For $63.89, you’re paying an incredibly expensive price for what can essentially be replaced by a cup of tea. The company also fails to provide any meaningful clinical studies. Most of the studies cannot be read without paying money to see, and it’s unknown if the entire formula is safe for most people.

The main issue with this product is the possibility of side effects, which many customers have experienced. Without a money back guarantee, you’re not allowed the opportunity to make a return.

There’s far too much at stake in terms of your health when you’re dealing with these types of supplements. No form of guarantee is provided, and the ingredients used are overpriced and potentially harmful.   


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