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Introduction

The brand SlimFast don’t really need any introduction – they’re huge, on TV, have a plethora of fat loss products for sale, and have one of the most popular low calorie diet plans out there.

It seems like every year SlimFast release a new product to support weight loss, and this year is no different, with the grand release of their latest formulation Advanced Vitality 4 in 1.

With big claims like “it’s scientifically proven formula will help you lose weight”, it’s easy to assume that this may be a foolproof method of slimming down.

In this SlimFast Vitality 4 in 1 review, we’re taking an in-depth look at this popular product to establish what it really is capable of, and most importantly, whether or not it’ll help you shed some of that excess body fat!

Readers please note that statements on this page are fair comment based on observation. This content is produced on a matter of public interest.

What Is SlimFast Vitality 4 in 1?

SlimFast Advanced Vitality 4 in 1 Action is a weight loss formula created by a brand named SlimFast.

The product comes in both capsule and sachet versions (both of which feature an identical formula) and cost between £15.99 and £55.99 depending on whether you purchase a 5, 10 or 20 day supply.

This product is available via the official SlimFast Vitality 4 in 1 website, as well as places like Boots, Holland & Barrett, Tesco and Amazon.

SlimFast Vitality 4 in 1 finds itself part of the “SlimFast 3. 2. 1. Plan” product range, and is targeted towards men and women who are looking for help losing body fat.

The product itself only contains two natural ingredients – a natural plant fiber named Glucomannan, and a shellfish extract named Chitosan. SlimFast themselves describe Advanced Vitality 4 in 1 as “scientifically proven”, going on to state that it works in harmony with your body to help you to lose weight, and reduce your appetite levels.

In addition to the promise of weight loss, consumers of SlimFast Vitality 4 in 1 are promised reduced appetite levels.

Does SlimFast Vitality 4 in 1 Work?

After conducting some research into this product, we believe that if used correctly, SlimFast Vitality 4 in 1 will be a useful tool for targeting a leaner physique, however if it’s improperly used it’ll likely have no real impact.

Firstly, to ensure that you have no misconceptions, SlimFast Vitality 4 in 1 isn’t what we’d call a “fat burner pill”; no ingredients inside this product have the ability to directly and independently “burn body fat”, nor will the formula help to rev up your metabolism or energy levels.

Ensure you’re not using SlimFast Vitality 4 in 1 simply to counter a bad diet and inactive lifestyle, that’s not how this works. We’d say you’re better of viewing SlimFast Vitality 4 in 1 as more of a “weight loss aid” than a foolproof method of losing belly fat.

The good news is, the two ingredients inside the formula are indeed backed by science – like we said, if used correctly it’ll almost certainly help you shed some fat.

In order for this product to work, you must be sticking to a low calorie diet (i.e. eating less calories than your body requires to sustain weight) – if you’re not doing this, the pills won’t work, that’s a hard fact. Secondly, you must take the serving (either a capsule or a sachet) directly before your three daily meals – if you don’t do this, it won’t work either.

If you are able to follow these directions, you’ll need to sustain usage for about 3 months. The results will come in slow and steady, but we’re very sure that you’ll be satisfied with your commitment, dedication and sacrifice.

The Pros & Cons Of SlimVast Vitality 4 in 1

Below is a list of what we personally believe to be the main positive and negative aspects of Vitality 4 in 1:

The Pros

  • It comes in both capsule and sachet form.
  • It contains Glucomannan which can contribute towards weight loss when used alongside a calorie-restricted diet.
  • It contains an ingredient named Chitosan which can help bind dietary fat.

The Cons

  • Product doesn’t contain any ingredients that will directly and independently “burn fat” or “boost metabolism”.
  • Will not boost energy levels or prevent diet-fatigue.
  • Capsules must be taken directly prior to meals to be effective.
  • Negative side effects are possible.

Editor’s Note: Shopping around? Click here to check out our highest-rated weight loss pill.

What Are The SlimFast Vitality 4 in 1 Ingredients?

We have found the following supplement facts for this product:

One Serving Contains: Glucomannan and KiOnutrime-CsG® (Chitosan).

Is SlimFast Vitality 4 in 1 Suitable For Everyone?

Both capsule and sachet versions are suitable for vegetarians, but may not be suitable for vegans (as Chitosan is a shellfish extract).

Those with abnormalities to the esophagus or gut should not use SlimFast Vitality 4 in 1. Those who are using the capsule-version of this product must ensure they take the capsule with enough water to ensure it reaches the stomach, otherwise there’s a risk of choking.

Pregnant or breastfeeding women, or persons under the age of 18 should consult with a healthcare professional prior to using the Advanced Vitality Capsules or Sachets.

Is SlimFast Vitality 4 in 1 Safe?

This formula contains no banned or illicit substances; we do not believe it poses any sort of health risk to consumers provided that the directions are followed correctly and daily serving amounts are not exceeded.

What Are The SlimFast Vitality 4 in 1 Side Effects?

We’ve compiled the following potential side effects based on the ingredients inside this formula:

  • Upset stomach
  • Constipation
  • Flatulence
  • Diarrhea
  • Bloating [1][2]

Note: these side effects are possible but may not be the typical user experience.

Are There Any SlimFast Vitality 4 in 1 Reviews From Customers?

We have found the following SlimFast Vitality 4 in 1 review testimonials via customers online:

These pills definitely helped to kickstart my diet. They helped keep my appetite low too. The pills are quite big to swallow, but after the 1 2 3 challenge I’d found i’d lost 8lbs!

After trying these I found that I was feeling like my appetite was suppressed for longer and that i was naturally eating less.

Please note that as we found these reviews on an official stockist website, we cannot guarantee their authenticity or legitimacy.

Our Final Verdict On SlimFast Vitality 4 in 1

To conclude our SlimFast Vitality 4 in 1 review, we believe that this product is a genuinely decent little weight loss support pill, albeit simple in formulation.

Starting with the positives, if used correctly, with a low calorie diet and exercise routine, we don’t really see how you could miss (of course it could be argued that if you’re dieting and exercise you may not need the pills, but that’s an entirely different debate) – the main takeaway point is that the science says the two ingredients inside SlimFast Vitality 4 in 1 are effective for supporting weight loss with sustained usage.

The downsides are, it must be taken before your meals to be effective – not many people like the idea of popping capsules or mixing up a sachet right before they tuck into the breakfast, lunch or dinner, but that’s just how it goes.

In addition to this, the formula doesn’t contain any ingredients that “boost metabolism” or “burn fat”, so users shouldn’t really expect rapid weight loss results – this is a product you’ll need to sustain usage for for at least 3 months on our opinion.

Finally, while it may be unlikely, you could experience some unwanted side effects, which could have you dashing for the bathroom or looking a little bloated!

Kath Ross, PhD
Kath Ross, PhD
Health Editor & Fact Checker at DietProbe
Kathryn is a Ph.D Health Editor here at DietProbe. She specializes in diabetes and weight control research and in her spare time she's a professional cat lady and wine connoisseur!
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Fact Checked


This article has been reviewed and fact-checked by a certified nutritionist, and only uses information from credible academic sources.