FucoTHIN is a fat burning weight loss pill that contains just one ingredient – a branded supplement composed of concentrated fucoxanthin – better known to most of us as seaweed extract. Clinical evidence suggests that it will help weight loss without side effects.

FucoTHIN looks pretty good at first glance but is this initial impression accurate? And is this supplement safe?

We take an in depth look at FucoTHIN to find out more.

FucoTHIN Pros

  • The sole ingredient Xanthigen has undergone clinical testing and may help support health and weight loss.
  • No stimulant side effects.
  • Appears to be safer than many other seaweed supplements on the market.

FucoTHIN Cons

  • Lots of negative feedback says that this supplement does nothing.
  • Scientists do not fully understand how fucoxanthin works for weight loss
  • Taking 9 capsules a day is inconvenient and expensive.
Watchdog Rejected Diet Pills
Garden Of Life FucoTHIN Fat Burner

FucoTHIN Review

FucoTHIN Facts

  • Contains just one ingredient; Xanthigen a patented supplement from Spanish supplements company PoliNat and available only to the supplements industry.
  • Natures Garden is a reputable US company.
  • Recommended daily serving is 9 capsules a day.

FucoTHIN is a weight loss supplement that contains just one ingredient- a branded product called Xanthigen. Xanthigen contains brown seaweed extract fucoxanthin combined with Punicic acid, a substance naturally found in pomegranates.

Seaweed and pomegranate may seem like an odd combination but Xanthigen has undergone clinical testing and looks very promising.

It seems to increase energy expenditure and fatty acid oxidation and it appears to target fatty white tissue (adipose fat) around the abdomen. Even better scientists monitoring clinical trials reported that Xanthigen was safe and appeared to be well tolerated.

A good point about FucoTHIN is that it will not cause stimulant side effects unlike most fat burners on the market. So if you are looking for some assistance to weight loss and don’t want to feel wired on caffeine, this supplement will probably appeal to you.

As expected US TV doctor, Dr Oz, has been quick to get in on the act and has described Xanthigen as a way to turbo charge your metabolism.

The company develop and market products to the supplements industry, which means that private individuals cannot buy direct from the manufacturer. Instead, supplement companies buy the brands for inclusion in their own products as has happened here.

As far as we can see, the most popular PoliNat brand is Xanthigen a patented protected formula.

We covered Fucoxanthin Slim, which also contains Xanthigen in a previous Watchdog review.

We have also covered numerous seaweed extract inspired supplements that look similar.

FucoTHIN comes under the Garden of Life label. This US company specialise in supplements to support a healthy lifestyle rather than just focusing on weight loss. The slogan is Empowering Extraordinary Health.

Other supplements in the range include FucoTHIN Green – which comes with added green coffee bean extract.

However Garden of Life do market detox supplements such as RAW Cleanse, which spoils an otherwise good impression. Taking laxatives and diuretics is not good for health and are linked to a wide range of side effects.

That said Garden of Life look to be a very reputable company. The company website has been in operation for 18 years and is not associated with any scam issues.

Garden of Life supplements are stocked in many stores and health food shops across the USA.

How to Take FucoTHIN

Take 1 softgel 3 times daily (3 total) with meals and 8 oz. of water.

Advanced Usage: Healthy Individuals may increase gradually to 3 softgels, 3 times daily (9 total) with food and at least 8 oz. of water.

Clinical studies indicate an average of 6 weeks of use before significant thermogenic response is experienced. Give FucoTHIN at least 8 full weeks before you can begin to notice change.

The sole ingredient Xanthigen is made by PoliNat, a Spanish supplements company based in the Canary Islands.

FucoTHIN Concerns:

  • FucoTHIN looks safe but is it really safer than other seaweed products on the market?
  • The cost. This supplement is expensive and designed to be used long term.
  • Even the positive genuine feedback mentions only very modest weight loss.

What Does FucoTHIN Claim To Do?

The FucoTHIN product information is very lengthy but the first thing you notice are the customer testimonials and impressive before and after pictures.

“I’ve lost 33lbs and dropped three dress sizes” says one customer. She looks great!

Other customers report similar success stories.

There is a lengthy explanation about Fucoxanthin the principle ingredient:

Fucoxanthin, contained in FucoTHIN, is a compound that is found in several different types of seaweed. Fucoxanthin is a carotenoid (similar to lutein and lycopene), which is a powerful antioxidant that protects cells from free-radical damage.

It explain how it helps weight loss:

Fucoxanthin is unique because it creates a thermogenic effect without stimulating the central nervous system

The information continues:

Fucoxanthin actually boosts your metabolism, without giving you the jitters or causing you to lose sleep. Instead of the shotgun approach of boosting your metabolism by stimulating the central nervous system, fucoxanthin breaks down fat without the increased heart rate.

Strangely, the pomegranate extract part of the formula is not mentioned in the advertising.

So What Is FucoTHIN and What Are The Ingredients?

FucoTHIN is a stimulant free weight loss supplement that comes in soft gel capsules.

Each soft gel capsule is equal to one serving.

Xanthigen Proprietary Blend (200mg): Xanthigen is composed of two ingredients.

  • Fucoxanthin: This is a xanthophyll – a pigment found in brown seaweed with a similar make up to carotene – the pigment in carrots. Studies carried out via animal testing suggest that Fucoxanthin increases thermogenin a protein (uncoupling protein) that promotes fat burning in white adipose tissue. (particularly found around the abdomen)
  • Pomegranate oil: This contains Punicic acid, a polyunsaturated fatty acid similar in composition to conjugated linoleic acid (CLA). Animal testing on rats suggested it might have anti obesity action.

When taken in combination as Xanthigen, results look extremely promising. The formula has undergone 2 clinical tests on human volunteers. In the first test, the volunteers were seen to increase the speed of the metabolism by 18.2 %.
In the second test volunteers, lost 4.5 % more weight than those who were just on a diet.

However according to scientists “the mechanism remains to be fully elucidated” In other words, it appears to work but they are not sure why or how! Xanthigen requires further testing to find out why it works but the good news is that it does seem to be effective.

So What Does All This Mean?

According to clinical studies and the product information, you will need to take this supplement for at least six weeks before you notice any effects. It is also important to combine it with a healthy eating plan and do some added exercise.

This means that you are going to be in for a long haul and for many people this will not seem worth it.

In addition, does this mean you have to commit to taking FucoTHIN forever?

Not everyone will want to commit to taking 9 capsules a day for months on end and although it is important not be impatient with weight loss, it is also important to remember that the weight loss results have not been fully evaluated and are only based on two small human clinical trials.

Does FucoTHIN Have Any Side Effects?

The long term safety of Xanthigen has not been studied but that said, this supplement looks safe for most people and customers have not mentioned any major associated side effects

However, brown seaweed can contain varying levels of iodine, which could be a problem if you suffer from a thyroid related medical condition.

In addition, Pomegranate oil can occasionally cause an allergic reaction with symptoms including runny nose, itching and breathing difficulties.

There are rising concerns about the safety of taking kelp and seaweed supplements because of the risk of contamination from the pollutants in the sea. According to a breast cancer information resource, seaweed can no longer be considered as healthy because of the risk of pollution.

However according to the product information, Xanthigen contains seaweed which is grown in “large cultivation tanks filled with pristine deep sea water,” making it look like one of the safer options on the market.

Not suitable for individuals under 18. Avoid if you are pregnant or breast feeding. Speak to your doctor before taking if you suffer from an existing medical condition or are taking prescription medication.

Any FucoTHIN Reviews From Customers?

There are plenty of customer reviews for FucoTHIN and as ever, it is a mixed bag of opinion.

Many customers have been pleased. This customer reported:

Very pleased when taken with a good diet. I saw improved results once I started Fuco Thin.


My stomach is shrinking! I’ve been taking 3 capsules per day for about 6 weeks now. I am losing about one pound per week but what I love is the fact that my muffin top is shrinking.

Some customers have used for years and are satisfied. As this consumer said:

Been using these on and off for years, had great weight loss results without any side effects.

Some customer have noticed results but have needed to take it for a long time to see any effect:

I used three bottles of this product for weight loss but I only lost about 5 pounds. However, that weight did stay off….. I know weight loss is more than just taking a pill. It has to be a change in nutrition and lifestyle as well. I did lose some weight so I am satisfied with using Fuco Thin.

Some customers are not satisfied.

This customer felt it just wasn’t worth it:

This is a costly product that I took for five months….. I saw absolutely no appreciable benefit when I used this product in conjunction with wise dietary intake and exercise vs. just proper diet and activity alone.

Other consumers have the same opinion. As this consumer pointed out:

I did not like this product at all First off, 9 pills is a lot for 3x a day. You have to go through at least 2-3 bottles to see a very small weight loss. I went through 1 bottle with no change.

Many people have reported similar experiences.

So Does FucoTHIN Work?

Some people think that FucoTHIN is helping their weight loss but it obviously is not working for everyone and the fact that you have to take it for such a long time is off putting.

There is no magic pill for weight loss. We all know that you have to put some effort in and work with a supplement. You can’t sit back and wait for results. That said, many customers are making efforts to lose weight and the weight loss hardly seems more than could be expected from a normal weight loss diet and exercise plan.

In addition, although the scientific evidence looks promising, the claims about weight loss remain unproven. The FDA warn that there is insufficient research into fucoxanthin to draw any firm conclusions.

Where Can I Buy FucoTHIN?

You can find FucoTHIN on sale from some health food shops and supplement stores across the USA and Canada. You cannot buy FucoTHIN direct from the product page or the Garden of Life website, which is linked to it.

If you live in the USA or Canada, you can use the FucoTHIN store locater to find the nearest store to your address.

FucoTHIN is also available online from a wide choice of online retailers including Vitamin Shoppe, eBay, Lucky Vitamin, Amazon and iherb.

We found FucoTHIN on sale from Amazon US

1 bottle of 90 capsules (10 days supply) costs $33.66

1 bottle of 180 capsules (20 days supply) costs $43.56.

You can also buy FucoTHIN via Amazon UK.

1 bottle of 90 capsules (10 days supply) costs £20.00 including delivery.

What About A Guarantee

FucoTHIN is not covered by a money back guarantee.

Watchdog Verdict

FucoTHIN looks to be a good quality supplement that you can buy from a range of outlets so if you wanted to try seaweed for weight loss, it may be a good choice. According to the product information, the seaweed is cultivated in pristine waters so is less likely to be contaminated by pollution unlike so many others on the market.

In addition, the branded ingredient Xanthigen has been clinically tested and results are promising.

In our opinion, this is a good quality supplement that if you take long term may have benefits for health and for weight loss. Many customers are satisfied.

That said we are not sure we would bother taking it ourselves. Taking 9 capsules a day for at least 6 weeks sounds inconvenient and expensive and even many of the positive customer reviews have only reported minimal weight loss.

This is not surprising. The clinical investigation did show some positive benefits but scientists still do not fully understand how Fucoxanthin works which is troubling. This ingredient needs further testing before we can really say one way or another.

This leads us to only one verdict. Yes, it may work for you but in our opinion, the likely results are unlikely to justify the price tag for most people. This gives us no other option but to reject FucoTHIN.

Watchdog Rejected Diet Pills

#1 Consumer Choice 2021: Phentaslim

Phentaslim is Diet Pills Watchdog Approved


Thousands of customers have cut the fat with this fast and powerful thermogenic fat burner. Can suppress appetite, boost energy levels and elevate mood without the jitters.

  • Over 100,000 satisfied customers
  • Manufactured in a GMP facility
  • 60-day money-back guarantee
  • FREE shipping and buy 3 get 1 FREE offers!
See our Full Review here

Disclaimer: Our reviews and investigations are based on extensive research from the information publicly available to us and consumers at the time of first publishing the post. Information is based on our personal opinion and whilst we endeavour to ensure information is up-to-date, manufacturers do from time to time change their products and future research may disagree with our findings. If you feel any of the information is inaccurate, please contact us and we will review the information provided.

Have Your Say

1 comment on 'FucoTHIN'

  1. fucothin pros and cons list: it lists lots of negative feedback, however there was way way more positive feedback than negative. So this review is folly. Since i have followed the directions, I’ve lost 25lbs, reached the proper height to weight ratio. got off high blood pressure meds, sugar level normalized (NO MORE diabetes). It was achieved between 6-8 weeks. Simply follow the directions on the box. 50yrs young.

Add your comment

We'd love to get your opinion. Please keep it clean and stay on topic, no spamming. Comments are moderated before being made live. Your email address will not be published.
We cannot give advice about medical conditions or prescription drugs. Please direct specific medical questions to your doctor.

This site uses Akismet to reduce spam. Learn how your comment data is processed.