How can you trademark kelp if it is a natural species?Updated 5 hours ago

We are not referring to kelp as a general species, our JSHealth Kelp™ refers to the name of our special combination of two specific kelp materials from Nova Scotia, which are harvested and then processed in a specific way in Tasmania, which is exclusive to JSHealth Vitamins. We have trademarked the name as JSHealth Kelp™ to mark this point of differentiation.