The History of Seaweed Use - China
People believe that seaweed has been used since 2700 BC in China. In 600
BC, Sze Teu wrote that in China seaweed was made for special guests
or kings. In 300 BC, Chi Han made a book about seaweed. Kelp was
used in the 5th century for food, and Laminara japonica was imported
from Japan in the 5th century.