You want to find a brand which is ground into a fine powder and that is constant in it's quality and that produces Positive Results for you!
"IF" it does not meet these qualifications, you need to find another brand to use!
The Kelp from the coldest ocean waters and from the Least Polluted waters may be the Best to use!
All Norwegian Kelp is not of the same Quality, this is true for other Kelp also, so you need to find a good supplier which delivers Quality product each time!