Phen375 Vs FenFast 375 – The Adipex Alternative!

Is there a specifically formulated fat burner designed to be a legal and safe substitute for prescription diet pills like Phentermine?

Tens of diet pills have been advertised as a substitute and share the same results.

Don’t get fooled by these tons of advertisement regarding this. Most are not true, only perhaps a few diet pills who have not failed in proving themselves as the best Phentermine alternative.

FenFast375 claimed to be so. It seems to be a fairly new supplement on the market and we would like to share our verdict on this pill with a complete cover up to all its aspects.

Comparing Fenfast375 to Phen375 is essential. As Phen375 has already been reviewed by thousands of customers and got its rank.

So taking it as a reference would do a great add regarding this review. So you can make a well-researched decision as to whether or not it is the perfect appetite suppressing and fat burning weight loss solution for you.




FenFast 375


Clinical studies


  •  Increase metabolic rate based on its thermogenesis effect leading to more energy.
  • Weight loss rate of 3-5 lbs per week.
  • Anti-depressant effect to avoid any depression during weight loss journey.
  • Appetite suppression; avoid food craving.
  • Enhances energy levels
  • Triggers thermogenesis in body meaning increasing metabolic rate.
  • Reduce food craving through appetite suppression effect.
  • Mood stimulator.
Side effects


prosNone; rare mild headaches Worst-fatburner-reviewsdry mouth and jittery feelings. It is also advised that people on medication should avoid the supplement.
Best uses prosBodybuilding, Energy Boost, Maintaining weight, Weight loss prosEnergy Boost, Maintaining weight, Weight loss
Money back guarantee


prosYes (30 days) Worst-fatburner-reviewsNo “very suspicious”
Appetite suppressant prosYes prosYes
Anti-depressant prosYes prosYes
Weight loss effect pros3-5 lbs per week (depending on your daily activity and food consumption) – Verified weight loss effect Worst-fatburner-reviewsIt claims that it helps to lose 3-5 lbs per week. However, many reports states that it didn’t provide weight loss result and some of the verified clients of this product reported losing maximum 10 lbs per month.
Reorder rate prosHigh Worst-fatburner-reviewsAverage
User reviews


prosExcellent – Check out what users say on Phen375 prosGood – scroll down to see various screen shots from users all over the web
Production company details RDK Global, they are the manufacturer and distributor of top selling weight loss and pain relief natural supplements. All their products are manufactured in FDA-approved laboratories in the United States and the European Union. Intechra Health Inc.

a US supplements company whom specialize in marketing what they say are close copies of Phentermine.



Can be available only on the official website Can be available on official website and Amazon.
Price $65.95 – per bottle (they offer free bottle on 3 bottle order) check their offers on the official site. $49.95 on official website and $59.95 on amazon.
Order now


Check out official website at

Check out official website at

 FenFast 375 Overview – Customer Reviews


In this review we will establish both the positive and negative aspects of the product before making an overall conclusion as to its effectiveness.

The company claims that fenfast 375 is designed to act similar to Adipex and Phentermine 37.5. Phentermine is a well-known anti-obesity medication approved by FDA. This drug has a wide range of unique characteristics which makes it special unlike the other drugs for obesity treatment. However, Fenfast is nothing like it regarding the ingredients and results. Trading on the Phentermine name is not unusual in the diet pill industry. It makes a diet supplement sound powerful and dangerous, which gives it an edgy appeal.

It’s sad to find Fenfast 375 using the name Phentermine and Adipex to market for themselves. Why deceive when you can receive good results on the long run. Moreover, this review isn’t about morals nor ethics. Let’s skip into science weather this product is effective or not

Mechanism of action

The main way that the product goes is through

  • full of stimulants and ingredients that do not play much of a role directly in weight loss but have a lot to do with your adrenalin.
  • Thermogenic effect through increasing metabolic rate.
  • Reducing hunger hormones and sugar cravings
  • Lowering stress and stress related Cortisol levels.


FenFast 375 tablet contains 4 key ingredients: they are

  1. Caffeine Anhydrous (1,3,7-Trimethylxanthine)
  2. Beta Phenylethylamine HCl (PEA)
  3. L-Theanine
  4. Hordenine HCl

Caffeine Anhydrous in Fenfast 3751- Caffeine Anhydrous; it is a Caffeine that is concentrated to give you that extra kick. In order to concentrate Caffeine, water has to be removed first making it “anhydrous” or Caffeine with 0.5 percent water. In contrast, hydrous caffeine found in coffee beans is diluted in 8.5 percent water. Caffeine anhydrous comes in the form of an odorless, dry white powder that is very bitter to taste.

Some of the Caffeine anhydrous effects are as follows:

  • Wakefulness
  • Mental Acuity
  • Increased body coordination
  • Improved Cognition
  • Appetite suppression

2- Beta Phenylethylamine HCL contained in chocolate and has been affectionately referred to as the ‘love drug,’ since it is released by our brains when we have feelings of romantic love. It has powerful anti-anxiety effects, increases focus and memory and can cause you to feel more motivated and driven when used appropriately. There are a number of side effects that might show up, especially with consistent use. These include heart burn, constipation, nausea, and mild headaches.PEA effect in the FenFast 375

3- L-Theanine; It can cross the blood-brain barrier and positively affect brain chemistry, scientists investigated its mood-modulating effects. The results of those studies have led to L-theanine being patented as a mood enhancer. The body is relaxed, the mind is calmed, but no drowsiness occurs. This is exactly the type of relaxation prescribed by sleep therapists.

4- Hordenine HCL; Researchers have indicated that Hordenine, as part of a more complete supplemental regimen, can produce increased energy expenditure in healthy people.

Z-Burn Drawbacks and sideeffectsFenFast 375 is mainly used for those two reasons:

  • Helps increase metabolism and significantly reduce appetite.
  • Improve cognitive function, stimulate higher energy levels and improve your mood.

FenFast 375 main drawbacks

  • Relatively expensive
  • May cause side effects

This produced is mis-advertised as an adipex or phentermine alternative. However, it results is far inferior comparing it to phentermine or adipex. So users must be aware that they are buying a different product category.

Safety Information

WARNING: Not intended for persons under the age of 18. If you are pregnant, have any medical condition or are taking medication, consult your doctor before use.


Don’t use this product if you are using any other dietary supplement or over-the-counter drug containing ephedrine, pseudo- ephedrine, or phenylpropanolamine (ingredients found in certain allergy, asthma, cough or cold, and weight control products). Do not use this product if you are using a monoamine oxidase inhibitor (MAOI), anticoagulant or antiplatelet medications, or any other prescription drug. Discontinue use and call a physician or licensed qualified health care professional immediately if you experience rapid heartbeat, dizziness, severe headache, shortness of breath, or other similar symptoms.


Take two tablets of Fenfast 375 with 8oz of water 2 times daily, approximately 30 minutes before meals. This product is intended to be used along with a calorie-reduced diet and regular exercise program. Do not take within 5 hours of sleep.

FenFast 375 Amazon User Reviews (click to enlarge)

FenFast Aipex Alternative Scam Review

FenFast Amazon before and after Reviews

FenFast Amazon Customer Reviews - 2

FenFast Amazon Reviews - 1

Bottom line with FenFast 375

There are no other diet products out there that can be associated in one way or the other with Adipex. Adipex is a drug that is known to work but any person that wants to use it will have to get a prescription from a doctor.

FenFast_Drawbacks_SideeffectsFenfast 375 acts as a great fat burner and made a great reputation in the last 2 years.

However, most who gave negative feedbacks were surprised that it plays majorly on the concept of caffeine anhydrous. The more caffeine the higher the metabolic rate.

This issue is problematic on the long term as taking caffeine as the main mechanism of action for weight loss will give the body caffeine tolerance.

The whole Fenfast 375 effect is tainted by the people who built up caffeine tolerance. the first time you take FenFast 375, you probably feel its effect very strongly, but if you continue taking it after 2 weeks, you’ll probably stop feeling the effects at all and eventually no weight loss result.

For that reason, we prefer Phen375, as this is considered one of it’s weapons in burning fat. But it’s not the main strategy and mechanism of action. Do check Phen375 deep review or visit the official website to learn more about this product.