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Fucoidan is a type of polysaccharide found in seaweeds that has been researched for its anticancer effects. It may benefit those with osteoarthritis and cancer patients undergoing chemotherapy treatment. Read on to see the benefits and mechanisms of fucoidan. If you are enjoying our content be sure to also check out our ebook, SelfHacked Secrets to find a comprehensive guide to biohacking like a pro. Download the first chapter here absolutely free.

What Is Fucoidan?

Fucoidan is a complex sulfated polysaccharide derived from rich sources such as bladderwrack, other brown algae, echinoderms, and seagrasses [R].

Fucoidan exhibits many different biological properties [R, R, R, R, R, R]:

  • Anti-inflammatory
  • Anti-coagulant (prevents blood clotting)
  • Anti-thrombotic (reduce formation of clots)
  • Anti-angiogenic (reduces growth of new blood vessels)
  • Anti-viral
  • Anti-tumor
  • Anti-oxidant

Research in marine food sources has helped reveal many potential remedies for an array of health issues – most being attributable to the presence of fucoidan.

Mechanisms of Action

Fucoidan triggers programmed cell death by decreasing the release of three metalloproteinase enzymes: MMP-1, MMP-3, and MMP-9 [R].

Fucoidan decreases NF-kappaB binding activity, p65 nuclear movement of proteins from the cellular fluid to the nucleus, and IκB-α degradation, which prevents inflammation [R].

Fucoidan stimulates an increase in natural killer (NK) cells and a decrease of transcription factor AP-I, which is involved in cellular growth and division. Fucoidan also kills T-cell leukemia virus type I (HTLV-1) by inactivating NF-kB, a regulator of antiapoptotic proteins [R, R].

Fucoidan activates caspases 8 and 9, enzymes involved in programmed cell death [R].

Benefits of Fucoidan and Fucoidan-Rich Foods

1) Fucoidan May Help with Osteoarthritis Symptoms

In a pilot study of 12 people with osteoarthritis (OA) of the knee, 100 mg of a fucoidan supplement given for three months reduced symptoms of arthritis by 18% and 1,000 mg of fucoidan reduced symptoms by 52% [R].

Another study (DB-RCT) of 122 people with OA of the knee and hip, 255 mg of fucoidan from bladderwrack showed no difference in reduction of arthritis symptoms compared to placebo [R].

2) Fucoidan May Help Fight Cancer

Fucoidan fight cancer by immune cell activation and increased production of anticancer cytokines [R, R, R].

Fucoidan extracted from bladderwrack cause cell death in various human cancer cells, including leukemia, breast cancer, stomach cancer, lung cancer, prostate cancer, and liver cancer cells [R, R, R, R, R, R, R].

Fucoidan blocked cell growth, caused programmed cell death, and suppressed formation of new blood cells in thyroid cancer cells [R].

The disease control rate (DCR) is the percentage of patients who have achieved complete response, partial response, and stable disease from a therapy. In a study (DB-RCT) of 54 patients with colorectal cancer, 4,000 mg fucoidan powder in addition to chemotherapy resulted in a DCR of 92%, compared to 69% in the placebo group [R].

3) Fucoidan May Prevent Clots

In a cell study, fucoidan increased the activity of proteins that block the coagulation process [R].

In a pilot study of 20 volunteers, 2,250 mg fucoidan for 12 days moderately decreased clotting ability by interfering with the final stage of the coagulation process [R].

4) Fucoidan May Fight Viruses

Fucoidans protect against many different species of viruses. Evidence for the effect of fucoidans against viruses include:

  • Fucoidan strongly inhibited influenza A infection in mice [R].
  • Fucoidan prevented herpes from entering cells in test-tube studies [R].
  • Fucoidans stop viruses from replicating and increase immune defense functions [R].
  • Fucoidan inhibited type 2 dengue virus in cell studies [R].
  • Fucoidan blocked HTLV-1 (human T lymphotropic virus type-1) infection in cell studies [R].
  • Fucoidan may be capable of preventing HIV infection by blocking the enzymes needed by the virus to replicate [R].
  • Fucoidan demonstrated potent antiviral activity against herpes of all types: simplex virus type 1 (HSV-1), HSV-2, and human cytomegalovirus [R].

5) Fucoidan May Protect the Brain

Fucoidan delayed the onset of disease in mice infected with scrapie, a disease that leads to mitochondrial dysfunction in the brain [R, R].

In a rat brain model, fucoidan prevented the death of neurons caused by β-amyloid plaques, which are involved in Alzheimer’s disease [R].

Fucoidan prevented overactivation of microglia that may lead to neurodegeneration [R].

Treatment with fucoidan reduces the encephalitogenic response (brain swelling and spinal cord swelling) in encephalomyelitis [R].

6) Fucoidan May Protect Against Radiation

Fucoidan provided protection from radiation in cells and in mice [R].

7) Fucoidan May Protect Against Chemotherapy

In mice given chemotherapy, fucoidan prevented gut inflammation and increased the length of villi in the gut [R]

8) Fucoidan May Protect the Stomach

Fucoidan inhibited Helicobacter infections in the stomach by preventing the bacteria from sticking to gut walls [R].

In rats given aspirin to cause ulcers, fucoidan prevented the ulcers from developing [R].

9) Fucoidan Protect the Liver

Due to fucoidan, bladderwrack helps to protect against chemically-induced excess scarring of the liver [R, R].

Fucoidan reduced alcohol-induced fatty liver disease in rats [R].

10) Fucoidan May Fight Malaria

Fucoidan helped fight malaria infection in cell studies and in mice [R].

11) Fucoidan May Help Prevent Kidney Stones

Kidney stones can be caused by high levels of oxalate. In rats with excessive oxalate in their urine, fucoidan normalized oxalate levels. Fucoidans also improved antioxidant status and reduced the risk of developing stones [R].

12) Fucoidan May Prevent Obesity

Fucoidan increased the activity of the enzyme that breaks down fat (lipase). Fucoidan also blocks glucose uptake into fat cells, which helps with fat loss [R].

Mice exposed to a high-fat diet gained less weight when fucoidan was included in their diet [R].

Side Effects of Fucoidan

Fucoidan appears to be very well-tolerated, with no reported side effects.

Carotenodermia, oranging/yellowing of the skin, may arise from excessive dietary intake of seaweeds [R].

Limitations and Caveats

Most of the studies on fucoidan are in animals or isolated cells and there is a lack of clinical trials to support the existing research. Further clinical trials are needed to confirm if fucoidan benefits humans. Caution should be taken when applying this research to use in humans.

Drug Interactions

Because fucoidan may be an anticoagulant (clot preventative), caution should be taken when using it with other anticoagulants such as warfarin or heparin [R, R].

Dosages For Fucoidan and Fucoidan-Rich Supplements

Dosage for fucoidan ranges from 100 mg to 4,000 mg twice daily.

Dosage toward the lower end of that range may be effective for osteoarthritis symptoms [R].

Dosage towards the higher end may be more effective as an adjuvant cancer therapy.


“This product has improved my ability to recover. Stressors, which would have resulted in fatigue, are no longer as big an issue.”

“If you are struggling with anything cancer related, I would not hesitate in recommending this one of a kind supplement.”

“Bought this for a lung cancer patient, because heard of some positive reports of fucoidan on cancer treatment. Taken 10 pills per day for over 4 months. Recent CT scan shown further dispersion of cancer cells.”

Buy Fucoidan Supplements

Health Tools I Wish I Had When I Was Sick

At SelfHacked, it’s our goal to offer our readers all the tools possible to get optimally healthy. When I was struggling with chronic health issues I felt stuck because I didn’t have any tools to help me get better. I had to spend literally thousands of hours trying to read through studies on pubmed to figure out how the body worked and how to fix it.

That’s why I decided to create tools that will help others cut down the guesswork:

  • Lab Test Analyzer – a software tool that will analyze your labs and tell you what the optimal values are for each marker — as well as provide you with actionable tips and personalized health and lifestyle recommendations to help you get there.
  • SelfDecode – a software tool that will help you analyze your genetic data from companies such as 23andme and ancestry. You will learn how your health is being impacted by your genes, and how to use this knowledge to your advantage.
  • SelfHacked Secrets – an ebook where we examine and explain the biggest overlooked environmental factors that cause disease. This ebook is a great place to start your journey if you want to learn the essential steps to optimizing your health.
  • SelfHacked Elimination Diet course – a video course that will help you figure out which diet works best for you
  • Selfhacked Inflammation course – a video course on inflammation and how to bring it down
  • Biohacking insomnia – an ebook on how to get great sleep
  • Lectin Avoidance Cookbook – an e-cookbook for people with food sensitivities
  • BrainGauge – a device that detects subtle brain changes and allows you to test what’s working for you
  • SelfHacked VIP – an area where you can ask me (Joe) questions about health topics

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  • Indriati Tanuwidjaja

    Where can I buy fucoidan in indonesia?
    And can it effect to ALS patient?

  • Ian

    Hello Will I didn’t see your reputable source for fucoidan at the bottom of this post I wonder whether you could provide thus for me and whether or not you think that Life Extensions Maritech formula Fucoidan from Patagonian waters is a good one ????
    Cheers and many thanks Ian

  • Daulat

    Hi, I have long gastristisis problem , is this product effective to solve my health cases pls

    1. Helen

      Hello Daulat, we cannot say whether or not a supplement will help solve your health problems.
      Fucoidan can help prevent H. pylori infections that contribute to gastritis, but its effects may vary from person to person. and

  • Ron

    Where is the best source for Fucoidan?

    1. Will Hunter

      Hi Ron,

      I have added a reputable source for fucoidans at the bottom of this post.

  • Marta L

    Excuse the double post but I forgot to click on the “receive follow-up comments” button. Joe, if you could let me know which brand you recommend and where it can be purchased I’d be so grateful. I have a friend about to begin chemo and I’d like to send her this information. Again, I have learned so much from your books and articles. Thank you for sharing your knowledge and experience with us.

  • Haim Benchimol

    I’ve some experience with Fuicoidan, I’ve found it great to treat non alcoholic fatty disease, liver cleanse, liver enzymes, immune boost and bladder cancer (this one in my dog). At the beginning it may cause some loose stools but it isn’t anything serious.

  • Justin Faraday

    Never heard of this one before. Do you think that the majority of the benefits come as a trickle-down effect of lowering inflammation? I starting to feel like everything traces back to inflammation and hormone imbalances. Have you noticed similar trends in your research?

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