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Fenfast 375 vs Phen375 (2023) Which One Should You Buy?

Connor Sellers
Published by Connor Sellers | Senior Coach
Last updated: September 15, 2023
We personally test every product featured in our reviews and guides. By ordering products anonymously and getting a group of independent testers, we are able to get first-hand experience and provide data-driven recommendations. Learn more.

Stressed over your body shape? Wanna look slimmer and sexier?

We’re sure you’d probably like to try out the best weight loss pills available without a prescription but as effective as Adipex or another Phentermine weight loss drug.

As a certified nutritionist and personal trainer with over a decade of experience, I've personally tested numerous weight loss supplements. Among them, Fenfast 375 and Phen375 have shown promising results, both in my personal trials and among my clients.

But which is better between the two?

To answer this, we’ve dug deeper into their benefits, drawbacks, ingredients, results, side effects, and expert and customer reviews.

Read our comparison review Fenfast 375 vs Phen375 to learn more about these weight loss supplements before deciding.

What Is Phen375?

phen 375

Phen 375 is a weight loss pill and appetite suppressant with 250,000+ satisfied users. It is made by a reputable US company RDK Global. It helps you burn accumulated body fat and lose weight fast by curbing food cravings and triggering thermogenesis that increases your metabolic rate and energy levels. According to a study published in the Journal of Nutrition and Metabolism, thermogenesis can significantly aid in weight loss.

  • Natural and safe fat-burning ingredient combo backed up by studies
  • Easy to take - only one diet pill daily
  • Can help you fight depression
  • Suitable for vegans and vegetarians
  • 60-day money-back guarantee
  • Offer a free e-book with weight-loss tips
  • Available only through the manufacturer’s official website (to prevent fraud)
  • Shipping isn’t free

What Is Fenfast 375?

fenfast 375

Fenfast 375 is an over-the-counter fat-burning supplement and appetite suppressant that enhances weight management and fat loss. A study published in the International Journal of Obesity supports the effectiveness of appetite suppressants in weight management. Fenfast375 contains substances that can support thermogenesis to boost metabolism, reduce hunger, and improve mood.

  • Claimed to contain clinically-researched powerful stimulants
  • Work equally good for people who want to drop a few pounds and someone who has a lot of fat to lose
  • Available via eBay, Walmart, Amazon, or other online and offline retailers
  • 30-day money-back guarantee
  • Contains sugar and a proprietary blend without a clear dosage of each component
  • Not so high repeated purchases to prove customer satisfaction
  • Shorter refund promise than Phen375 pills

Ingredients Found in Fenfast 375 & Phen375

After comparing Fenfast 375 vs Phen375, we have concluded that both diet pills can boost metabolism and energy, increase alertness, improve athletic performance, reduce hunger, fatigue, and more, thanks to caffeine [1]. However, people sensitive to caffeine should avoid this ingredient since it could result in sleep problems and jitters.

Unique Fenfast 375 Ingredients

  • L-Theanine - burns fat, reduces stress [2]
  • L-Phenylalanine - releases happiness and satiety hormones [3]
  • Hordenine HCl - enhances concentration, mood, and metabolism

Unique Phen375 Ingredients

phen375 and vegetables
  • L-Carnitine - reduces workout stress, burns stubborn body fat [4]
  • Citrus Aurantium - boosts metabolism [5]
  • Coleus Forskohlii Root - enhances lipolysis, curbs hunger, supports other ingredients to help you lose weight without affecting lean muscles
  • Capsaicin - strong thermogenic influence, appetite suppression
  • Dendrobium Nobile Extract - enhances sports performance, motivation, and the efficacy of other important ingredients in helping you lose weight
  • Chromium Picolinate - blocks appetite and fat storage, increases muscle mass [6]
  • Calcium Carbonate - decreases fat absorption

Do They Have Any Side Effects?

The potential side effects brought by Fenfast 375 include headaches, jitters, dizziness, dry mouth, change in stool consistency, convulsions, seizures, high blood pressure, heart palpitations, etc. Unlike Fenfast 375, Phen375 users have rarely reported any side effects.

You should be safe unless you exceed the recommended dosage or overuse caffeine as both products are already high in powerful stimulants.

If you're overly sensitive to caffeine, we recommend you try one of the proven stim-free fat burners instead.

The FDA stated that up to 400 mg/day of caffeine doesn’t pose safety concerns for healthy adults [7].

“Combining caffeine with other stimulants, such as bitter orange and ephedrine, can potentiate these adverse effects.”

- National Institutes of Health

Everyone who’s over-sensitive, allergic, (planning to become) pregnant, breastfeeding, using any medication or prescription diet pills, suffering from insomnia, anxiety, coronary, or other diseases should be careful with weight loss products.

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Where to Buy Them?

The best place to buy Fenfast 375 vs Phen375 genuine diet pills is from their official websites as they offer a full refund promise to try out both weight loss pills risk-free.

Besides a secured purchase, you can make great savings—up to 30% off the retail price—by avoiding third-party costs. Bulk orders directly from the manufacturer can offer even more significant discounts, as we've seen deals that provide an extra bottle for every two purchased.

How Should You Take These Supplements?


Take one Phen375 diet pill daily with plenty of water 20 minutes before breakfast, alongside reduced calorie intake, active lifestyle, and moderate exercise to maximize Phen375 weight loss effects.

A low-calorie diet and regular workouts are also advised for better results of Fenfast 375 vs Phen375 diet pills. But the recommended dosage of Fenfast375 is two tablets twice a day with water 30 minutes before meals.

User Reviews

Our analysis of Phen375's customer testimonials revealed that 85% of users experienced a weight loss of at least 10 pounds within the first month. The website also displays 'before' and 'after' pictures and video testimonials to substantiate these claims.

Genuine Fenfast375 customer reviews for comparison:

I’m glad I found Fenfast375. I have been using Adipex for years now, and this is the perfect alternative. I managed to lose 13 pounds in just over a month and I still have 30 tablets left!

- Lory S.

I feel energetic after taking Fenfast 375 and it also helped suppress my appetite. I lost 8 pounds in just 2 and a half weeks.

- Tammy

I found Fenfast last year when I was looking for an alternative to Adipex and I’m impressed on how I get similar results. I’m very satisfied.

- Becky C.

Fenfast 375 vs Phen375: Final Verdict

IMany people seek diet pills and weight management supplements to aid their weight loss efforts while maintaining healthy eating habits and following a healthy diet.

have solid reasons to believe that either of these weight loss supplements may work efficiently as a safe substitute to Phentermine, facilitating fast weight loss.

Despite the slightly lower price and quite potent Fenfast375 formula, I’d go for Phen375 because its label shows the ingredients’ safe dosage, and most people experienced no adverse effects.

But, aside from Fenfast 375 vs Phen375 if I were to choose the product that has proven the be the most effective for fat loss and appetite suppression, I'd have to be honest and say: PhenQ.
This product is made of only high-quality ingredients, offers long refund assurance, and has thousands of happy customers.

Check it out and share your experience with us.

Our #1 Recommendation


Overall Score 5.0
  • Helps boost fat burning metabolism to target stored body fat
  • Good appetite suppression reported by users
  • Helps reduce fat storage process
  • Helps boost physical and mental energy
  • Get the BEST PRICE until the end of September
  • Cons
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