Fucoxanthin Slim Review

Editor's Review: 3.5 / 5.0

What You Should Know

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Fucoxanthin-Slim is a supplement that contains brown seaweed extract (Fucoxanthin) and pomegranate oil under the brand name Xanthigen. Xanthigen has been the topic of clinical study and doctoral thesis, but the two results we found negated each other. The clinical study, which lasted 16 weeks, showed reduced body weight and increased energy expenditure. The thesis, which also lasted 16 weeks, showed no increased energy expenditure, but weight loss was not attributed to Xanthigen.

List of Ingredients


  • Fucoxanthin Extract
  • Pomegranate Oil
  • Punicic Acid
  • Gelatin
  • Olive Oil
  • Glycerin
  • Bees Wax
  • Purified Water
  • Palm Oil

Product Features

Dieters have thousands of supplements to choose from in the weight loss market – which accounts for the billion-dollar income the industry claims each year, but few supplements have been clinically tested let alone clinically proven. Fucoxanthin, a brown seaweed extract, has been the topic of multiple clinical studies and several report weight reduction, body fat reduction and increased energy expenditure, but not all studies have the same result.

We were more interested in two doctoral thesis papers written on Xanthigen. Both papers noted significant weight loss in the study population, but the weight loss was attributed to reduced calorie intake, not the Xanthigen supplement. There is a good chance the clinical studies also required a reduced calorie diet and thus the weight loss results.

As for Life Extension’s Fucoxanthin-Slim, there is no evidence this supplement will work even though it contains Xanthigen. The company does not bother to list the positive clinical trials or testimonials from dieters who have successfully lost weight while taking the supplement. We did find a few testimonials for the product, but many of the dieters claimed weight loss when taking Fucoxanthin-Slim with another supplement like 7-Keto or Advanced Anti-Adipocyte Formula.

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  • Life Extension lists the ingredients in Fucoxanthin-Slim on the official website.
  • The product is relatively affordable.
  • Multiple clinical trials have been completed on Xanthigen – the active ingredient.


  • Clinical trials resulted in contradictory results.
  • Weight loss can take up to 16 weeks or four months.
  • There is no mention of adopting a healthy diet and exercise program.


Fucoxanthin-Slim may be a fantastic diet supplement, but we are not sold on the clinical studies. With two doctoral thesis papers written on Xanthigen – both coming to the same conclusion, there is little doubt Xanthigen claims are overstated. Clinical trials are usually a fantastic selling point, but Life Extension doesn’t even bother to mention the positive studies.

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