Fucoidan Benefits and Cancer: What the Research Shows

Fucoidan is a compound found in brown seaweed that has drawn growing interest from researchers, particularly for its possible effects on cancer and the immune system. This post covers where fucoidan comes from, how seaweed has been used in Traditional Chinese Medicine and what the research shows so far, including what it does not show.

Fucoidan is not a proven treatment for cancer and should not replace care from your oncologist. If you have cancer or are in treatment, talk with your oncologist before using it.

What is Fucoidan?

Fucoidan is a sulfated polysaccharide found primarily in the cell walls of various species of brown seaweed, including Kombu, Wakame and Mozuku. It was first described in 1913 by Professor Kylin of Uppsala University in Sweden, who noted its slimy texture.

The Historical Roots of Seaweed in Medicine

Seaweeds have been valued for their medicinal properties for centuries, particularly in Asian cultures. Ancient texts like the "Shen Nong Ben Cao Jing" (The Divine Farmer's Herb-Root Classic), one of the oldest Chinese medicinal texts, mention the use of seaweeds. Traditional use is an important part of this history, but it does not show that a remedy works for a specific disease.

Types of Fucoidan and Their Sources

• Mozuku (Cladosiphon okamuranus): found in Okinawa, Japan, and rich in fucoidan.
• Mekabu (Wakame, Undaria pinnatifida): commonly eaten in Japan.
• Kombu (Laminaria japonica): a brown seaweed widely used in East Asian cooking.

What Research Shows About Fucoidan and Cancer

Lab and animal studies

In laboratory and animal studies, fucoidan has been reported to trigger cell death in cancer cells, slow the growth of new blood vessels around tumors and stimulate immune cells. These are early findings. Results in lab dishes and animals often do not carry over to people.

Studies in people

Human evidence is limited. A 2022 systematic review of fucoidan as a supplemental therapy found only four studies with 118 patients in total, most with metastatic colorectal or gastric cancer. Results were inconsistent. The one randomized trial found better disease control with fucoidan, but no statistically significant difference in survival. The review also noted that most of the studies were sponsored by institutes that sell commercial fucoidan.

Larger, well-designed trials are needed before anyone can say whether fucoidan helps people with cancer.

Other Areas Being Studied

Researchers are also looking at fucoidan's effects on immune function, cholesterol and blood clotting, digestive health, inflammation and skin. Much of this work is early, and these benefits are not established in people.

Using Fucoidan Safely

Fucoidan may have blood-thinning effects. Ask your doctor before using it if you take anticoagulants, have a bleeding disorder or are having surgery. If you are in cancer treatment, check with your oncologist first, because supplements can interact with some therapies.

Learn More

If you would like to learn more about natural remedies at Soho Acupuncture Center, feel free to contact us or schedule an appointment with Diem Truong, L.Ac.