Arctic wrack is a brown seaweed traditionally gathered from cold northern coastlines for mineral-rich preparations. It has been used in coastal foodways and seaweed infusions. This marine plant grows attached to rocks in intertidal waters of northern oceans.

Bladderwrack is a brown seaweed recognized by the air bladders along its branching fronds. It has long been gathered as a mineral-rich coastal herb and food. Native to North Atlantic shorelines, it is best known for sea vegetable use, teas, and traditional iodine-rich preparations.

Irish moss is a red seaweed traditionally used in soothing preparations and as a natural thickener. It has long been simmered into mucilaginous drinks, broths, and gels. Native to the North Atlantic coastline, Irish moss is valued for its mineral-rich fronds and carrageenan content.