Updated: 02/02/2016 - Sponsored by Leptigen

USN Diet Fuel Ultra Lean Review - Does This Meal Replacement Shake Work? Are bad taste and lack of availability deal breakers?

Editor's Review: 3.5 / 5.0

usn-diet-fuel-ultra-lean-product-imageYou’re about to learn everything you need to know about USN Diet Fuel Ultra Lean. We created a detailed review, closely scrutinizing the ingredients, side effects, clinical studies and level of customer care. Moreover, we focused on plenty of user comments and dieter reviews from around the web. Lastly we compacted all the facts and responses we found to give you the bottom line.

EDITOR'S TIP: Combine USN Diet Fuel Ultra Lean with a proven fat burner such as Leptigen for better results.

What You Need To Know

USN Diet Fuel Ultra Lean is a “nutrition shake” for women and men that is claimed to promote weight loss and help with lean muscle maintenance. It is available in five different flavors, which include chocolate, vanilla, strawberry, banana caramel and café latte. Since this is a company based in the UK, it does not look like this supplement is available to people in other parts of the world, such as the US. The primary ingredients found in this supplement powder include; Whey Protein Concentrate, Soy Protein Isolate, Milk Protein Isolate, Garcinia Cambogia, Micronized Milk Mineral Complex, Inulin and various vitamins and minerals. Each scoop/serving provides 25.4 grams of protein. USN Diet Fuel Ultra Lean is simply added to a glass of cold water and then consumed.

It looks like USN Diet Fuel Ultra Lean was released in 2013. This product contains a decent amount of fiber per serving and there are some positive comments posted online. Also, this product can be used at any time, but read on…

Bad Taste – A Concern?

“You will notice quite a few customer complaints online regarding the actual taste of USN Diet Fuel Ultra Lean shakes. This is never a good thing because how will you stick to these protein shakes if you can’t stand the taste?,” says our Research Editor.

According to one customer, “Too sweet and sickly for me. Could only get through half of it before giving up. Six hours later I still have a sweet chemical aftertaste. Regret buying this. Will look for better alternative.”

“I thought it tasted horrible and no matter how much I mixed it in my shaker it just didn’t blend well. Lumps of powder. Terrible stuff,” said another user.

Scroll below for one of the best products we’ve seen over the last year.

Lack of Availability – Another Concern

It looks like USN Diet Fuel Ultra Lean is only available to those living in the UK. Therefore dieters from other countries will certainly have a difficult time trying to get this supplement. One person stated, “Where can I buy this?? It doesn’t seem to be available online.”

Another dieter said, “Only seems to sell in the UK. Oh well, on to a different product.”

The intensive research we’ve done has shown if there is one particular facet of a supplement or diet program that is especially bothersome (a painful/difficult exercise routine, bad taste, lack of availability) the odds of prolonged success are not good. This means if USN Diet Fuel Ultra Lean does in fact taste bad to numerous people and is difficult for many dieters to find, this could be a serious dilemma.

The Science – Any?

Like most protein powders, USN Diet Fuel Ultra Lean provides a significant amount of protein per serving. However, we were unable to find any clinical studies that support the claimed effectiveness of this supplement. At DietSpotlight, we need to see solid research that backs up the weight loss claims.

The Bottom Line: Does USN Diet Fuel Ultra Lean Work?

So, should you run out and buy USN Diet Fuel Ultra Lean? Well, we like that USN Diet Fuel Ultra Lean provides a good amount of fiber and there are some positive comments about it online. But we have some reservations about this supplement because it’s not backed by clinical studies. Furthermore, we’re concerned about this product’s bad taste and lack of availability.

If you’d like to drop more weight, then we encourage you to go with a supplement that is readily available online, contains clinically proven ingredients and comes with excellent customer service.

Among the best products we’ve seen in 2015 is one called Leptigen. Its formula is a proprietary blend of four key ingredients, which have been shown in documented clinical studies to help speed up fat loss and boost metabolism. We can’t pinpoint any talk of negative adverse effects and dieter comments found on the web show people are seeing substantial results.

The makers of Leptigen are so excited about their product they’re offering a Special Trial Offer, which is a positive sign.

Learn More About Leptigen »
GD Star Rating

How Does USN Diet Fuel Ultra Lean Compare?

Previous USN Diet Fuel Ultra Lean Review (Updated July 8, 2014):

What You Should Know

Click Here To See Our Highest Rated Review

There are plenty of meal replacement products at your disposal these days. As you are likely aware, these supplement shakes and bars are intended to be eaten in place of a meal, which includes breakfast, lunch, and dinner. Often it is recommended that you eat the meal replacement formula instead of breakfast or lunch. This way you can still eat a good dinner, but decrease your daily calorie intake. USN Diet Fuel Ultra Lean is one product that falls into this category. It is a powder formula that comes in flavors like chocolate, pina colada, vanilla, chocolate mint, and strawberry. The cost of this supplement is around $40 per canister.


  • whey protein
  • calcium caseinate
  • soy protein isolate
  • egg albumin powder
  • maltodextrin
  • MCT
  • CLA
  • L-carnitine
  • boron
  • chromium picolinate
  • selenium
  • fructose
  • protein
  • vitamin b1
  • potassium
  • vitamin a
  • phosphate
  • biotin
  • magnesium
  • vitamin d3
  • folic acid
  • vitamin c
  • niacin
  • vitamin e
  • vitamin b2
  • pantothenic acid
  • vitamin b12
  • vitamin b6

Product Features

USN Diet Fuel Ultra Lean is intended to be consumed in place of one or more meals each day. This is a low-calorie shake, but it does contain a number of vitamins and minerals. This way you can still receive the nourishment you need, but without a great deal of fat and calories. This powder is easily combined with water, just as most meal replacement shakes are. It should encourage a feeling of satiety.

You receive 200 calories from a single USN Diet Fuel Ultra Lean shake. This product contains ingredients and nutrients like B vitamins, folic acid, whey protein, calcium, potassium, vitamin a, chromium picolinate, soy protein, and magnesium. The proteins used in this supplement powder should help stave off cravings and hunger pangs.

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  • This product contains plenty of vitamins and nutrients.
  • USN Diet Fuel Ultra Lean is rich in protein.
  • This supplement may help suppress food cravings.


  • There is no money-back guarantee for this product.
  • No key ingredients are used to burn off fat.
  • Some people might not be willing to consume a shake instead of meals.
  • A pill or capsule supplement is more convenient.


One thing we noticed about USN Diet Fuel Ultra Lean is that each serving only contains 200 calories. While this might be good for weight loss, you should keep in mind that you need at least 1200 calories per day. Therefore a serious drawback to this supplement is that it might leave you feeling very hungry. Then there is the lack of fat burning ingredients. Clearly USN Diet Fuel Ultra Lean shakes are not intended to boost the metabolism or assist with fat burning. This factor alone might turn some dieters away.

14 User Reviews About USN Diet Fuel Ultra Lean

Leave comments below
  • 1

    I have depression and on matazipen which make me gain weight will diet fuel usn help me lose weight whilst on these tablets


    Cameron (Editor)

    Hi Sue, these pills claim to promote weight loss however you must ask your doctor if these pills are suitable to take with your prescription of Matazipen.


  • 2
    Mrs Smith

    Can I have USN diet fuel ultra lean at night time even though I’ve had my evening meal I’m craving something sweet.


    Arnold (Editor)

    We don’t see why not just as long as USN Diet Fuel Ultra Lean is added to a glass of cold water and then consumed.


  • 3

    Does it work to get abs and musles


    Arnold (Editor)

    Ruan it is a “nutrition shake” for women and men that is claimed to promote weight loss and help with lean muscle maintenance.


  • 4

    Hi I was recently diagnosed with type 1 diabetes I want to know is it save for me to drink one of the things I was told I need to loose weight
    Thank you


    Stephen (Editor)

    Hi, Karen. Whether recently diagnosed with an illness or not it is important that you ask your doctor whether or not a dietary product is right for you.


  • 5

    Can I use the milkshake with ARV’s


  • 6

    I just started using the usn diet fuel ultra lean together with the preda cut two days ago..im experiencing very bad stomach cramps. I need to know maybe im not supposed to take both?


  • 7
    Jeremy 22/09/14

    i have using USN Hyabolic for three week and over the last weeks i have started getting chest pians,to was the most sever. Does your product have any side effects?

    I have been using EVOX for:-)the past 4 month and have not have had this problem before!


  • 8
    khumalo Minicooper khumalo

    This product is working like a fat burner?


  • 9

    Would a low carb diet work with diet fuel ultra lean


  • 10

    I was wondering if the diet fuel ultralean is good for a weight loss program?


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