Seaweeds offer a wide range of therapeutic possibilities both internally and externally. The term Seaweeds in this case refers only to macrophytic marine algae, both wild and cultivated, growing in saltwater.
Botanically, seaweeds are classified as Green, Brown, or Red. A particular seaweed’s placement in one of these groups is determined first by its photosynthetic pigments, then its reproductive mode, then its micro and macro morphologies, and finally by its phycopolymers. The obvious visual color of a particular seaweed species may not match its taxonomic color, which can be confusing to the beginner. Persevere.
Download and read the full article: Medicinal Uses of Seaweeds, by Ryan Drum, Ph.D.