The seaweeds with swollen tips are members of the genus Fucus (commonly called rockweeds). The different Fucus species have a variety of common names that are often used interchangeably.

But do these health claims stack up? Let’s take a look. Some products also contain the brown algae Fucus vesiculosus (commonly known as bladderwrack, black tang, rockweed, sea grapes ...

But it’s effectiveness is questionable. Bladderwrack (Fucus vesiculosus) is a type of brown seaweed that’s tied to traditional medicine. It’s also known as rockweed, red fucus, dyers fucus ...