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Fenfast 375 vs Phen375
What’s the Better Option for You?

Connor Sellers
Published by Connor Sellers
Fact checked by Donald Christman, BHSc FACT CHECKED
Last updated: October 20, 2021

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.

For us, there are two supplements that might have just hit the mark: Fenfast 375 and Phen375 fat burners.

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.

  • Natural and safe fat-burning ingredient combo backed up by studies
  • Easy to take - only one 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

Find out more in our in-depth Phen375 review.

See how Phen375 compares to other weight loss pills:

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.

It 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

Common Ingredients

When compared, both diet pills can boost metabolism and energy, increase alertness, improve athletic performance, reduce hunger, fatigue, and more, thanks to caffeine. [1]

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 prescription medication or other diet pills, suffering from insomnia, anxiety, coronary, or other diseases should be careful with weight loss products.

Where to Buy Them?

The best place to buy Phen375 and Fenfast375 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 by avoiding third party cost, getting special offers or lower prices for bulk orders, using coupon codes, or other discounts when ordering products directly from the manufacturer.

How Should You Take These Supplements?


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

A low-calorie diet and regular workouts are also advised for better results of Fenfast375 diet pills, but its recommended dosage is two tablets twice a day with water 30 minutes before meals.

User Reviews

Phen375 website displays customers’ “before” and “after” pics and video testimonials confirming how they’ve achieved their weight loss goals.

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.

Which Product Do I Recommend?

I 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, if I were to choose the product that has proven the be the most effective for the 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


Ingredient Quality
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
  • Cons

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