The U.S. Food and Drug Administration forced the manufacturer of Royal Tongan Limu to destroy about $3 million of product because of health claims they made without substantiation, notes Dr. Andrew Weil. While the claims about limu juice have moderated since then, it's a product that still raises red flags.
The original claims made about limu juice dealt with killing cancer cells and healing arthritis pains. More recent claims include increased energy and improved sleep. Even so, the distribution of the juice happens through multilevel marketing rather than through traditional retail outlets. Its active ingredient, fucoidan, has not demonstrated any sustained health benefit in trials. These facts suggest that people interested in health should choose different supplementary products, reports Dr. Andrew Weil.