Best Rated Diet Pills Free Trial Scams


Rasva fat binder is advertised as a natural fat binding diet supplement. Unfortunately its key ingredient has not been proven to aid weight loss.

Below we have reviewed Rasva against our review criteria to help consumers make an informed decision.


Rasva Pros
  • Not associated with any severe side effects
  • Easy to take
Rasva Cons
  • Limited clinical trials or evidence to back up claims
  • A full ingredients list is not provided

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Rasva Review

Rasva is advertised as a natural fat binder. The product contains just one ingredient – chitosan – a substance that is usually obtained from the exoskeleton of shellfish, but in this case is sources from a strain of mould. Evidence surrounding these claims is inconclusive.

Claimed weight loss benefits

Rasva is claimed to work as a fat binder – preventing some of the fat molecules consumed in the diet from being absorbed by the body.

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How Rasva Works

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Rasva natural fat binder tablets supposedly work by effectively preventing a percentage of the fat that you consume from being absorbed in to the body. It claims to do this by being able to recognise excess fat as it enters your stomach. It then purportedly targets this and binds to it making it harder to digest and absorb. The body then instead of digesting it, passes it straight through your system and is excreted out. Its manufacturers claim on their FAQ page that whilst users can continue to eat ‘as usual’, with no need to follow a ‘restrictive diet’, they ‘could still lose weight’.


Chitosan is the active ingredient of Rasva, the substance that gives the diet pill its so-called fat-binding qualities. Many chitosan-based diet pills use chitosan derived from shellfish, crabs and lobsters. It’s a sugar that’s found in the shells of these creatures. Rasva uses a vegetarian formulation of chitosan that is derived from aspergillus niger mycelium, the black mould that is often seen growing in damp houses and buildings. Not particularly appetising, but an option for vegetarians or people with seafood allergies who want to experiment with diet pills which use chitosan. This variation on chitosan is called KiOnutrime-Cs Chitosan and each tablet contains 500mg of the sugar.

Chitosan is said to have a positive ionic charge thanks to free amino groups in its chemical make-up and so negatively charged molecules are attracted to it. The chitosan in Rasva allegedly attracts negatively charged fatty acids and creates a mass of them too large to pass through the walls of the digestive tract. Instead these fats, along with all their calories, are excreted from the body.

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Key Rasva Ingredients

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There is very little known about the ingredients in Rasva pills. On the main website it only lists one main ingredient and it is said to be the key ingredient responsible for the fat binding action: a natural plant fibre, called KiOnutrime-CS. Nothing else is said about any other ingredients which is a concern that is raised in many Rasva reviews.

Investigating into the ingredient rather than the Rasva natural fat binder pills themselves shows that some clinical trials have been conducted. However, few of these are reliable. Very little is known about the diet pill in general which could mean some Rasva side effects are yet to be known too.

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Clinical Studies

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The product itself has not been the subject of any clinical studies. Chitosan is the active ingredient of Rasva. Several preliminary studies have been conducted to assess whether chitosan helps users to lose weight.


In a 1999 trial involving 34 volunteers, Pitter et al examined whether chitosan was able to significantly affect weight loss when no other dietary alterations were made. This is a particularly interesting trial considering that Rasva’s manufacturers claim on their FAQ page that ‘you can carry on eating as usual, you don’t have to put up with a restrictive diet and you could still lose weight!’

Participants in this trial were between the ages of 18 and 60 and had body mass indexes between 23.9 and 29.9. The subjects received either four 250mg capsules of chitosan twice daily or four placebo capsules. This chitosan dosage equates to two Rasva tablets per day. After four weeks it was found that there were no statistically significant differentiations in weight loss or cholesterol levels between the chitosan group and the placebo group. However, subsequent analysis of the chitosan preparations used indicated that they contained only 42% of the chitosan they claimed to, meaning that participants had been taking roughly the equivalent of one Rasva capsule per day.

After this trial, chitosan’s efficacy in aiding weight loss remained in doubt. A long-term placebo-controlled trial was conducted to attempt to establish conclusively whether chitosan lived up to what many manufacturers of chitosan-based weight loss supplements were claiming. Between November 2001 and December 2002, 250 participants took part in a 24-week trial during which time some participants took a 3g dose of chitosan daily whilst others took a placebo. 3g of chitosan would be equivalent to 6 capsules of Rasva, the maximum daily dose that should be taken.

All participants received the same lifestyle and dietary advice, which promoted healthier habits conducive to weight loss. After the findings of the trial were analysed, it was concluded that the very small amount of weight loss achieved amongst the chitosan-taking participants was not great enough to be considered clinically significant when compared to the placebo group’s weight loss.

This 2005 study aimed to establish whether chitosan is an effective treatment for overweight and obesity by reviewing fourteen individual, randomised controlled trials that had previously been conducted. Altogether these trials involved 1071 patients who were overweight or obese, and/or who suffered from hypercholesterolaemia (high cholesterol levels). Each trial reviewed had lasted a minimum of four weeks and so constituted long-term chitosan intake.

Having analysed all these trials, the study concluded that whilst chitosan preparations did appear to result in a small but statistically significant larger reduction in body weight than placebos, when analyses were limited to high-quality trials it seemed that reduction in weight achieved during these trials tended to be lower than that achieved during low-quality trials. By contrast, the results of high-quality trials indicated that any weight loss achieved through chitosan was unlikely to be clinically significant, that is to say that the effect of chitosan on body weight was minimal when compared to placebo.

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Rasva Side Effects

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No major side effects have been linked to Rasva natural fat binder tablets. However, it is possible that users will experience constipation or diarrhoea if the product does actually work to bind fat molecules. Without a full ingredient list or scientific studies on the product as a whole, it is not possible to provide a comprehensive list of potential side effects associated with Rasva.

Rasv’s website warns that ‘persons with sensitive stomachs or bowels may occasionally experience disorders such as constipation, stomach aches, nausea, vomiting or diarrhoea’.


Chitosan is deemed by WebMD to be possibly safe for use in the short time (up to six months), and also when applied to the skin. Unfortunately, not enough information is available on chitosan from clinical studies to determine its safety with any certainty. When taken as a supplement, it might cause constipation, gas, stomach upset, and gastro-intestinal pain. It is not recommended for pregnant or breastfeeding women.

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How to Use

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If you are overweight (Body Mass Index >26), you are instructed to take two to three capsules prior to two out of three of your main meals. Capsules should be taken with a large glass of water fifteen minutes before eating. This dosage is recommended to assist weight loss.

If you are aiming to control your weight, you are told to take one to two capsules 15 minutes before two out of three of your main meals with a large glass of water. If you are underweight (Body Mass Index <18), you should not use Rasva. You should not use Rasva if you have any of the following digestive disorders: Inflammatory diseases of the gastrointestinal tract Acid reflux disease Gastritis Ventricular or duodenal ulcers Crohn’s disease Ulcerative colitis Diverticulitis Signs of intestinal obstruction (impending or existing mechanical or paralytic ileus) Gastroparesis in diabetics with neuropathy, intestinal polyps and existing severe digestive disorders (constipation) You should not use Rasva if you are pregnant or breastfeeding. Taking Rasva whilst pregnant or breastfeeding risks interrupting the supply of nutrients your baby needs to grow and develop properly. Note also that Rasva should not be taken by children or adolescents unless you have consulted your doctor. If you are taking oral contraceptives or hormone replacement therapy, do not take these medications at the same time as Rasva capsules as Rasva can interfere with their effects. Make sure to leave at least four hours between taking such medications and swallowing your Rasva capsules. Please also note that taking more Rasva than recommended does not make the product any more effective, but may increase the likelihood of your suffering side-effects. If you intend to take Rasva for longer than four weeks you need to seek medical advice beforehand. view our best diet pills chart

Who Makes It?

There are two names behind Rasva, its manufacturers KitoZyme SA, and its distributors Famous Rainbow.

KitoZyme is said to have been established in 2000 as a ‘spin-off’ from the University of Liège. It went through a number of phases of research and development, establishing its capabilities for mass production and commercialisation. It is a Belgium-based company that describes itself as specialising in utilising biopolymers in promoting health, meaning that it uses naturally-occurring substances in developing products that provide solutions to issues in the spheres of health nutrition, animal nutrition, cosmetics, food and drink and medicine.

To make their products they supposedly utilise three fibres that are sourced renewably from non-GMO vegetable sources. One of these fibres is chitosan, the active ingredient of Rasva. Many other fat-binding pills that use chitosan source the fibre from the shells of lobsters, crabs and shellfish, meaning their products are not vegetarian. KitoZyme, on the other hand, use chitosan derived from the black mould that grows in damp buildings.

Famous Rainbow is an Irish company that also trades under the name Natural Health and this latter title is the name under which Rasva is marketed, except for in India where it’s marketed by Corona Remedies. Famous Rainbow sells directly to Holland and Barrett.

In 2010, the Advertising Standards Agency held that a particular advert placed in a health magazine by Famous Rainbow breached advertising codes. For instance, the advert referred to Rasva being able to help users achieve weight loss from particular parts of their body, a claim weight loss aids cannot legally make.

Another of the complaints upheld against Famous Rainbow on this occasion was that their advert stated on two occasions that because Rasva is made from naturally-derived substances it is entirely safe and has no side-effects. This is simply not the case. The findings of the ASA against Famous Rainbow (which upheld all eight of the complaints made against the company) can be seen here.

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Where to Buy Rasva


Rasva can be bought from Amazon and the official website; it is no longer stocked by Holland and Barrett.

Rasva is available to buy through Amazon. It’s important to remember that Amazon itself does not stock the pill; it is private sellers using Amazon as a sales platform who offer Rasva for purchase. Whilst this means that their prices are competitive compared to one another and to the official website, you need to make sure that you are aware of Amazon’s ‘A to Z Safe Buying Guarantee’, the details of which are available here, to protect yourself when buying online from third-party sellers.

Rasva’s price on Amazon varies from seller to seller. The lowest amount for which 60 capsules is available is £15.35 and the most expensive £22.10. Simply entering ‘Rasva’ into Amazon’s search box will reveal most of the sellers.

One bonus to purchasing Rasva through Amazon is that you are able to read customers’ reviews of the product before you try it yourself, and their opinions of the seller. Check that the seller has not disappointed others in the past to avoid unnecessary stress.

You can also purchase Rasva direct from the official website. For 60 capsules the product costs £24.95, but there is also an accompanying £2.99 postage and packing charge. The only discount the website offers is 240 capsules for the price of 180 (£74.85) along with free postage.

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Does Rasva Meet our Approved Criteria

Money-back-guarantee: There is no mention of a money-back guarantee.

One-off payment: Yes, it can be purchased through the official website or Amazon.

Manufacturing Standard: No manufacturing standards are mentioned.

Accompanying Diet Plan: A diet plan does not appear to be offered alongside the product.

Ingredients and quantities disclosed: No – a full ingredients list isn’t provided.

Company contact details readily available: We could not find full contact details for the company.

Rasva does not meet our ‘Approved’ criteria as there is no money-back guarantee or diet plan and some information is lacking, including manufacturing standards and a full ingredients list.

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Overall Verdict

Rasva is claimed to target just one of the give key areas of weight loss – fat binding. No full ingredients list is provided for the product, but the potential fat-binding capabilities are said to be the results of the one active ingredient revealed – chitosan. The product itself has not been clinically studied and chitosan has only been the subject of preliminary trials with mixed results. Due to a lack of studies, potential side effects of this product are not fully known.

Average rating:  
 15 reviews

Rasva is magical

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Long time for little loss

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stomach hurts on rasva!

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Poor product

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Might have lost weight on the toilet!

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Wanted to carry on, just couldn't!

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Not suited to fat binders??

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slow and slight pains

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Going to keep going!

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mild stomach pains

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Not good enough

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I'm never going to lose weight!

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this is a con!

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no weight lost

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