Phentaslim, how does it work, side effects, customer testimonials and comments

Last updated on February 26th, 2020

Phentaslim UKPhentaslim weight loss capsules are produced in the US by Optimum Nutra Inc. Although the name Phentaslim hints the capsules could be yet another Phentermine substitute we are pleased to say this is not the case.

The world already has far too many Phentermine substitutes. No more are required.

Effective dieting solutions are always needed though, and the marketing spiel certainly suggests Phentaslim falls into this category.

recommended diet productsClaims: To increase metabolic rate and help you burn calories more efficiently, reduce appetite and hunger.

Positives: Many positive reviews, excellent ingredient profile.

Negatives: 30 day guarantee could be tad longer (this has now been upgraded to 60 days)

Latest special offers are buy 3 and get a fourth free – this equates $32.50 / £22.50 per bottle

Click here to view special offers from official website

Phentaslim Benefits

Phentaslim is marketed towards men and women who require a product that “crushes the appetite and shifts fat” to help them “look slimmer and feel more confident”.

  • Ramp Up Your Metabolism
  • Easily Suppress Your Appetite
  • Sharper Thinking and a Clearer Mind.
  • Boosts Energy Levels
  • Turn you in to a Fat Burning Machine for a lean, sexier and healthier body!

What does Phentaslim do

That all sounds great, but let’s cut to the chase: it’s a combined appetite suppressant and fat burner. There are already plenty of those on the market, so let’s take a look at the blend and see if anything makes this product stand out from the rest.

Phentaslim Key Ingredients

Two Phentaslim capsules contain:

Vitamin B1 (1.3 mg)Vitamin B2 (1.7mg)
Vitamin B6 (1.8mg)Vitamin B12 (10mcg)
Zinc (15mg)Niacin (20mg)

B vitamins are believed to promote a healthy metabolism so it is not uncommon to find one or more of them included in weight loss formulations. The same can be said for zinc and niacin.  It’s nice to see some inclusion rates listed though, so full marks there.

Although the vitamins and minerals may help support the weight loss process, the main powerhouse ingredients of the Phentaslim blend are:

  • Guarana seed (100mg):  Guarana is a potent source of caffeine, but it releases it much slower than most other caffeine-providing ingredients. This ensures a longer-lasting supply of energy and lessens the likelihood of caffeine-related side effects [source].
  • Caffeine Anhydrous (150mg):  Caffeine powder. Caffeine is a powerful stimulant that can boost energy levels and may also provide appetite suppression. Some people can be sensitive to caffeine, but the amount here is equivalent to that provided by a strong cup of instant coffee so it should not be an issue [source].
  • Green Tea (125mg):  Green tea is rich in antioxidants, offers many health benefits, and has a reputation for inducing fat burning [source].
  • Cayenne (50mg):  A tested and proven metabolism booster that can help maximize the body’s fat burning abilities and provide some extra energy.
  • Niacin (Nicotonic Acid) (20mg)When taken at sufficient levels vitamin B3 can lower cholesterol levels and strengthen heart health. It is an ingredient that is present in many of today premier supplements.
  • L-Tyrosine (200mg):  An amino acid believed to reduce stress levels and improves mental focus [source].
  • L-Carnitine (250 mg):  A combination of the amino acids lysine and methionine, L-Carnitine is believed to boost the metabolism and ensure efficient fat burning.
  • Panax Ginseng Root (75 mg):  A herb with a long history of use in traditional Chinese medicine. Panax ginseng offers many health benefits and is believed assist weight loss by working as a carb-blocker [source].

[info]Usage Instructions – Capsules are taken with water. The first capsule of the day is taken 20 minutes before breakfast. The second capsule is taken 20 minutes before lunch and the manufacturers stress the importance of eating less and taking regular exercise.[/info]

Phentaslim Customer Feedback

Phentaslim Customer Feedback

Independent reviews are plentiful with the official Phentaslim website providing several testimonials.

One satisfied Phentaslim customer states:

[plain]”Gave me lots of energy to kick those gym sessions, love it. Found the weight dropping off me and not buzzed like other pills I have tried. It’s made my appetite go way down. My confidence is at an all time high since taking Phentaslim, dropping 2 dress sizes has helped a lot!”[/plain]

Other testimonials are equally glowing.

customer reviews of Phentaslim

Phentaslim Side Effects and Other Issues

Although use of the capsules is unlikely to entail side effects, pregnant and nursing mothers are advised not to take Phentaslim, or any other supplement, without a doctor’s approval. The same advice is offered to anyone who has any health issues or concerns.

[warning]*The capsule casing contains gelatin, so Phentaslim is not a vegan-friendly product.[/warning]

The Bottom Line

Phentaslim is a recommended product.

It is not by any means a particularly cheap weight loss option, but the blend contains an impressive mix of ingredients that are included in sufficient quantity to provide the kind of results the manufacturers promise; so in this case it may be worth paying a little extra and the presence of a 60 day money back guarantee ensures dieters have nothing to lose by buying and trying the product.

Purchasing Options & Considerations

Phentaslim StockistPhentaslim can only be purchased from the official product website. Worldwide shipping is offered and all purchases are protected by a 60 day money back guarantee.

A single bottle of 60 Phentaslim capsules will last around one month.

There are special offers and price discounts from time to time with the current best value special offer being buy 3 and get 1 for free.

Visit Phentaslim website and view discounts

About Natalie Jay 279 Articles
Natalie Jay is a writer and freelance journalist specialising in the weight loss industry. She has a strong background in writing product reviews and writes accordingly. Natalie is the head of editorial team of several health related websites. You can read more about Natalie Here


  1. I saw that Phentaslim is suitable for customers twho workout.
    I don’t workout much (maybe twice a week?), will Phentaslim still be suitable for me?

    • Most diet pills are better suited for people who exercise Kristy. Phentaslim is a product that encourages exercise, it can can give you more energy and causes a thermogenic reaction.

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