Treat it as an herb
A normal, healthy person should be able to eat asian hair moss, a type of cyanobacteria (looks like a strange plant).
It can be added to soups and stews, in moderate amounts, similar in amount to adding a half-cup of cilantro or bean sprouts. Variety is the key in nutrition
. Problems occur when a person eats too much of just one plant, so a bit of hair moss once every week or two should be fine.