It was difficult to come across supplement data for KAL Fucoidan.  I was able to find that it uses Laminaria japonica (kelp) as their primary source of fucoidan. They harvest their kelp from waters off the coast of Spain. I see several downsides. They have no efficacy boosters, the fucoidan source is kelp  and its not Organic.

After careful research that compared iodine and sodium content with a number of published research papers, and cost, I have come to find that fucoidan source from Undaria pinnatifida (wakame) is superior and thus gets more points in my reviews. KAL Fucoidan comes from kelp.

The U.S. Food and Drug Administration recommends that individuals consume no more than 2,300 milligrams of sodium per day, and that certain groups, like those with high blood pressure limit intake to less than 1,500 milligrams per day. Please remember that kombu and kelp is estimated to average about 2,660 mcg per gram. Avoid fucoidan sourced from kelp and kombu.

Conclusion:

Though I am happy with some aspects of their product, including the low price of $29.00 per bottle, I recommend purchasing a fucoidan supplement that uses wakame as its primary source of fucoidan to minimize the sodium and iodine content.