I have no clue, email the company or contact them and ask about the tests they do on it. I use Kelp and Dulse from www.seaveg.com I believe, read up on their tests. The food is very cheap too, a big bag for like 5 dollars and it will last a few weeks. Solgar I have no clue, but if it is not fully tested and it's from the sea I would be cautious.

In Sanskrit, tulsi means literally "the incomparable one" and has been revered since ancient times. Tulsi, the holy basil, is said to have grown at the site of Christ’s crucifixion and is associated with St. Basil’s feast.